67 GT500
Thinking about options to stop running 4K RPMs on the freeway on a regular basis.
Running a 3.89 rear end, but I'm hesitant to swap it. I've done that on other cars before and don't like losing the low end.
What do people think about swapping in a 5 speed versus a GearVendors? Would like to keep it as original as possible. I'm not sure if either of these are thought better or worse of in that department. Other ideas?
Tremec all the way
doing a conversion next week on my 65
have one in a 69 GT500, 2100 rpm at 70 mph, comes out of the hole like it has 4:11's . The 428 has ample torque to pull the car, rarely does one have to downshift on the freeway
you can actually have a conversation on the freeway, the noise level drops significantly and you don't have to go see you dentist and get your fillings checked after a long drive :)
+1
To keep it as original as possible, keep your 4-speed bell and use the adapter plate. If You use a Tremec bell, you have to switch to a hydraulic clutch or cable. Both require more modification.
Hone-O-Drive annouced they were gearing up to go back into production.
http://hone-o-drive.com/
Unfortunately, It appears it did not happen. Too bad, I would love to have one. They maintain their website tho???
Be gentle on your T-5. They are known to be fragile compared to a toploader.
If you're buying a new trans, go for the "Z" spec on the T5. You could also go with a low profile TKO. That'll handle the torque. It all depends on how you want to drive and how much you want to spend.
Will the Low profile TKO fit?
http://www.mustangandfords.com/how-to/drivetrain/1605-put-a-five-speed-in-big-block-mustang/
This article says it does. I haven't done it myself. I have done a few T-5s and they seem to hold up well. I wouldn't put it in a track car, but
for cruising and spirited driving, they seem fine.
After talking to many members that had converted their 66, I have done a T-5 swap with mechanical linkage with 3:89 rear and enjoy have the overdrive. The T-10 has been set aside. It takes awhile to get used to the new low first gear. I used a later edition World Class T-5 (all T-5 are not the same) to avoid early model failures (ask anyone who raced an old Fox body Mustang) and more torque handling in the latter editions. You gas bill will be more acceptable. 8)
Trans swap will keep it more original looking - lighter too. Can the trans swap be done without cutting any of the floorboard? If not then I'd go the gear vendor/hone-o-drive route.
Quote from: Don Johnston on April 16, 2018, 04:39:39 PM
After talking to many members that had converted their 66, I have done a T-5 swap with mechanical linkage with 3:89 rear and enjoy have the overdrive. The T-10 has been set aside. It takes awhile to get used to the new low first gear. I used a later edition World Class T-5 (all T-5 are not the same) to avoid early model failures (ask anyone who raced an old Fox body Mustang) and more torque handling in the latter editions. You gas bill will be more acceptable. 8)
T-5 for a small block is fine . T-5 for a bigblock is taking a smallblock trans for granted and expecting too much IMO.
I run some t5s in my mustangs and all the small block cars handle it just fine. They made t5s for the 4 and 6 banger cars DO NOT USE THOSE. Find a 302 performance version. A small cut is necessary in the top right corner of the hole for the shifter to come thru.This is necessary when you go up into 5 gear. It is minimal approx. 3/8 must be trimmed no biggie for what you get from the conversion, ALOT of benefits. If budget is not a concern a TKO 6 speed box is available also fits the trans tunnel, I believe modified motor mounts were necessary to drop the whole thing 3/4 to 1 inch for clearance on everything to fit properly. Where there is a will there is a way. :)
This is all great info! Thanks to all for posting...had no idea.
Been trying to post pictures. That's an hour of my life I'll never get back! I'll try again the morning.
One more attempt. No cutting required. Trans in neutral.
(http://www.saacforum.com/gallery/267-170418095901-951321.jpeg)
Quote from: Brandon on April 16, 2018, 11:19:57 AM
67 GT500
Thinking about options to stop running 4K RPMs on the freeway on a regular basis......."
In your shoes, this would be my preferred order of options:
1) do nothing. your car is not being damaged, or subject to accelerated wear by running it @ 4,000 rpm. If the trip requires it, your BB can run all day long at 4,000 rpm and then do it again day after day. It's not abuse, it's exercise. I like highway cruising at 3,500 to 4,200 rpm and have spent many full days traveling running those numbers. No need to downshift when passing, and the engine is making beautiful music in the midrange.
2) change the rear end gearing to 3.50. just buy a complete 3.50 pumpkin and in 2 hours you will be done with the swap. That will drop the rpm down to 3,500 more or less, which may be less objectionable. Your low rpm torque will not dramatically be changed.
3) a 5 or 6 speed swap is giving up too much of the 1960's character of the car for my liking. You might as well go al the way and just put all Shelby Mustang sheet metal on top of modern underpinnings and be done with it. However, many people love it. IMO, driving modern cars has ruined their perspective.
In other words, they have gotten soft.
Z
Trans in 5th.
(http://www.saacforum.com/gallery/267-170418095901-950761.jpeg)
Shifter from underneath.
(http://www.saacforum.com/gallery/267-170418095901-9491026.jpeg)
Quote from: zray on April 17, 2018, 09:42:22 AM
Quote from: Brandon on April 16, 2018, 11:19:57 AM
67 GT500
Thinking about options to stop running 4K RPMs on the freeway on a regular basis......."
In your shoes, this would be my preferred order of options:
1) do nothing. your car is not being damaged, or subject to accelerated wear by running it @ 4,000 rpm. If the trip requires it, your BB can run all day long at 4,000 rpm and then do it again day after day. It's not abuse, it's exercise. I like highway cruising at 3,500 to 4,200 rpm and have spent many full days traveling running those numbers. No need to downshift when passing, and the engine is making beautiful music in the midrange.
2) change the rear end gearing to 3.50. just buy a complete 3.50 pumpkin and in 2 hours you will be done with the swap. That will drop the rpm down to 3,500 more or less, which may be less objectionable. Your low rpm torque will not dramatically be changed.
3) a 5 or 6 speed swap is giving up too much of the 1960's character of the car for my liking. You might as well go al the way and just put all Shelby Mustang sheet metal on top of modern underpinnings and be done with it. However, many people love it. IMO, driving modern cars has ruined their perspective.
In other words, they have gotten soft.
Z
A slightly taller tire maybe a fast and inexpensive alternative. Say, going to a 235/60-15" if you aren't already
A 225/70-15" is even taller, effectively dropping your rear end ratio even further
Factory bell and z-bar.
(http://www.saacforum.com/gallery/267-170418095901-948856.jpeg)
KR Convertible, is that a T-5 or a TKO?
Car model year?
What is the Un-used wire dongle for?
T-5 in a 65 convertible 289. The wire is for an ECM I think. Probably for a neutral safety switch. There is a separate back-up light switch further back on the trans, you can see the wires running under the neutral safety switch wire.
Quote from: KR Convertible on April 16, 2018, 01:23:46 PM
If you're buying a new trans, go for the "Z" spec on the T5. You could also go with a low profile TKO. That'll handle the torque. It all depends on how you want to drive and how much you want to spend.
I want to drive it on a regular basis (let's call it a daily driver), but also want to take it on the track here and there. I'm concerned about the robustness of a T5/Tremec. Let's assume money is no object. Do I want an older one?
Quote from: 2112 on April 16, 2018, 01:01:53 PM
Hone-O-Drive annouced they were gearing up to go back into production.
http://hone-o-drive.com/
Unfortunately, It appears it did not happen. Too bad, I would love to have one. They maintain their website tho???
Be gentle on your T-5. They are known to be fragile compared to a toploader.
I didn't know they were talking about ramping these back up. I do see them on eBay from time to time. This would certainly seem more period authentic than a GV given that it's got a manual/mechanical switch versus an electric one. But you'd presumably need to cut a spot for it somewhere.
Do you think the hono-drives or GV's will hold up to the torque if I take it on the track occasionally?
Quote from: Brandon on April 17, 2018, 01:38:55 PM
Quote from: KR Convertible on April 16, 2018, 01:23:46 PM
If you're buying a new trans, go for the "Z" spec on the T5. You could also go with a low profile TKO. That'll handle the torque. It all depends on how you want to drive and how much you want to spend.
I want to drive it on a regular basis (let's call it a daily driver), but also want to take it on the track here and there. I'm concerned about the robustness of a T5/Tremec. Let's assume money is no object. Do I want an older one?
You want the GT COBRA HO-5,0 version typically in late 80s to md 90s production maybe even a little newer. V8 specific not its little brother version.
I'm not familiar with the Cobra T5. Do you know the Tremec model number? The most robust one they make now is the Z spec. It's rated at 300 ft-lbs.
If you want to track the car, I would look at the low profile TKO 500 or TKO 600 rated at 500 and 600 ft-lbs respectively. I have never put a TKO in an old Mustang myself, but the article I posted earlier says it can be done without floor mods.
A new T5 Z spec is around $1800 and the TKO is around $2600.
Quote from: Brandon on April 17, 2018, 01:40:50 PM
Quote from: 2112 on April 16, 2018, 01:01:53 PM
Hone-O-Drive annouced they were gearing up to go back into production.
http://hone-o-drive.com/
Unfortunately, It appears it did not happen. Too bad, I would love to have one. They maintain their website tho???
Be gentle on your T-5. They are known to be fragile compared to a toploader.
I didn't know they were talking about ramping these back up. I do see them on eBay from time to time. This would certainly seem more period authentic than a GV given that it's got a manual/mechanical switch versus an electric one. But you'd presumably need to cut a spot for it somewhere.
Do you think the hono-drives or GV's will hold up to the torque if I take it on the track occasionally?
I never heard good things about the hone holding up well under high torque ,drag racing road racing conditions but then they were rare even back in the day so it is hard to gauge info input as typical or reliable.
Gear Vendor rates their unit to 1000lbs right?
I think Randy G. has had some racing experience with the Hone. Baldwin Motors used them more than anyone it seems. When I see them on Ebay, they are the Camaro unit which is up by (or on) the transmission as opposed to the Ford unit being on the 3rd member.
I love the mechanical lever aspect as well. I have only seen one. It was at the Portland Oregon swap meet in 1987. It was on a red '66 GT350 and the owner loved it. He autocrossed and road-raced the car. It had the lever next to the driver's seat.
I never asked if it was fragile tho.
Quote from: Brandon on April 17, 2018, 01:40:50 PM
Do you think the hono-drives or GV's will hold up to the torque if I take it on the track occasionally?
Not sure that it's the torque or the shock from that sort of usage. The one I have came out of a 1 ton or larger Ford truck.
Ran a F350 7.3 diesel for 250K with a Gear Vendor. Never a problem in those towing or pulling conditions
Can't say I've ever heard or seen one with the internals destroyed but as mentioned not allot of them around to have allot of experiences or stories about this use.
The BW T-5 changed over the years. I am using a 1994 World Class T-5 from a Cobra Mustang (previous owner switched to auto after only 100 miles because of heavy traffic in his area!), which is stronger than previous generations.
Info on the difference in T-5 over the years: http://www.moderndriveline.com/Technical_Bits/t5_history.htm
Also, the trans fluid is different for different series of T-5.
I installed a Gear Vendors on my Toploader in my 69 GT350 I really like it. It works great
Dan
Quote from: Dan353 on April 17, 2018, 06:18:55 PM
I installed a Gear Vendors on my Toploader in my 69 GT350 I really like it. It works great
Dan
Would love to learn more. Can you share pictures and suggestions?
The Tremec was used in the Cobras of 93,94,95 these are the best cars of their generation and all parts on those cars are top shelf. Make sure you know what gen t5 you have some used gear oil and some used atf !
Quote from: 2112 on April 17, 2018, 04:08:19 PM
Gear Vendor rates their unit to 1000lbs right?
I think Randy G. has had some racing experience with the Hone. Baldwin Motors used them more than anyone it seems. When I see them on Ebay, they are the Camaro unit which is up by (or on) the transmission as opposed to the Ford unit being on the 3rd member.
I love the mechanical lever aspect as well. I have only seen one. It was at the Portland Oregon swap meet in 1987. It was on a red '66 GT350 and the owner loved it. He autocrossed and road-raced the car. It had the lever next to the driver's seat.
I never asked if it was fragile tho.
Sorry, are you saying the Ford unit mounts directly to the 3rd and the driveshaft connects to it, versus the Camaro version that sits in the middle or mounts on the transmission?
Here's the list of completed Hone-O's on eBay. Are these all for Camaros?:
https://www.ebay.com/itm/Hone-O-Drive-Overdrive-Unit-Baldwin-Motion-Phase-III-Yenko-With-Output-Yolk-/332462111969?hash=item4d68493ce1%3Ag%3ABc0AAOSwtnpaGd63&vxp=mtr&nma=true&si=rwvt0TDy4ja%252BLtPUgwSPWplYo%252FM%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
https://www.ebay.com/itm/Hone-O-Drive-overdrive-/202259880561?hash=item2f17a0da71%3Ag%3AQXkAAOSwyytaqDgQ&vxp=mtr&nma=true&si=rwvt0TDy4ja%252BLtPUgwSPWplYo%252FM%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
https://www.ebay.com/itm/NOS-HONE-O-DRIVE-OVERDRIVE-MOTION-PERFORMANCE-SHELBY-PHASE-III-CAMARO-427-YENKO-/173150795587?hash=item2850977743%3Ag%3A90sAAOSwKXdafcPL&vxp=mtr&nma=true&si=rwvt0TDy4ja%252BLtPUgwSPWplYo%252FM%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
https://www.ebay.com/itm/Hone-O-Drive-Overdrive/232735893047?hash=item363023e637:g:LSwAAOSwnbla1D8B&vxp=mtr
Quote from: 2112 on April 17, 2018, 06:22:46 PM
Quote from: Dan353 on April 17, 2018, 06:18:55 PM
I installed a Gear Vendors on my Toploader in my 69 GT350 I really like it. It works great
Dan
Would love to learn more. Can you share pictures and suggestions?
+1. Would love to see what one of these looks like installed.
Quote from: Brandon on April 17, 2018, 10:34:40 PM
Sorry, are you saying the Ford unit mounts directly to the 3rd and the driveshaft connects to it, versus the Camaro version that sits in the middle or mounts on the transmission?
Here's the list of completed Hone-O's on eBay. Are these all for Camaros?:
https://www.ebay.com/itm/Hone-O-Drive-Overdrive-Unit-Baldwin-Motion-Phase-III-Yenko-With-Output-Yolk-/332462111969?hash=item4d68493ce1%3Ag%3ABc0AAOSwtnpaGd63&vxp=mtr&nma=true&si=rwvt0TDy4ja%252BLtPUgwSPWplYo%252FM%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
https://www.ebay.com/itm/Hone-O-Drive-overdrive-/202259880561?hash=item2f17a0da71%3Ag%3AQXkAAOSwyytaqDgQ&vxp=mtr&nma=true&si=rwvt0TDy4ja%252BLtPUgwSPWplYo%252FM%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
https://www.ebay.com/itm/NOS-HONE-O-DRIVE-OVERDRIVE-MOTION-PERFORMANCE-SHELBY-PHASE-III-CAMARO-427-YENKO-/173150795587?hash=item2850977743%3Ag%3A90sAAOSwKXdafcPL&vxp=mtr&nma=true&si=rwvt0TDy4ja%252BLtPUgwSPWplYo%252FM%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
https://www.ebay.com/itm/Hone-O-Drive-Overdrive/232735893047?hash=item363023e637:g:LSwAAOSwnbla1D8B&vxp=mtr
Yes,
and I believe all of those on eBay mount to the transmission tail or is supported midway between the transmission and third member.
Quote from: 2112 on April 17, 2018, 11:28:46 PM
Quote from: Brandon on April 17, 2018, 10:34:40 PM
Sorry, are you saying the Ford unit mounts directly to the 3rd and the driveshaft connects to it, versus the Camaro version that sits in the middle or mounts on the transmission?
Here's the list of completed Hone-O's on eBay. Are these all for Camaros?:
https://www.ebay.com/itm/Hone-O-Drive-Overdrive-Unit-Baldwin-Motion-Phase-III-Yenko-With-Output-Yolk-/332462111969?hash=item4d68493ce1%3Ag%3ABc0AAOSwtnpaGd63&vxp=mtr&nma=true&si=rwvt0TDy4ja%252BLtPUgwSPWplYo%252FM%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
https://www.ebay.com/itm/Hone-O-Drive-overdrive-/202259880561?hash=item2f17a0da71%3Ag%3AQXkAAOSwyytaqDgQ&vxp=mtr&nma=true&si=rwvt0TDy4ja%252BLtPUgwSPWplYo%252FM%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
https://www.ebay.com/itm/NOS-HONE-O-DRIVE-OVERDRIVE-MOTION-PERFORMANCE-SHELBY-PHASE-III-CAMARO-427-YENKO-/173150795587?hash=item2850977743%3Ag%3A90sAAOSwKXdafcPL&vxp=mtr&nma=true&si=rwvt0TDy4ja%252BLtPUgwSPWplYo%252FM%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557
https://www.ebay.com/itm/Hone-O-Drive-Overdrive/232735893047?hash=item363023e637:g:LSwAAOSwnbla1D8B&vxp=mtr
Yes,
and I believe all of those on eBay mount to the transmission tail or is supported midway between the transmission and third member.
Well that's a bummer. Any pointers or numbers on one that's actually intended for a Ford?
Randy and Jeff know way more than I do.
That Hone site I linked to earlier appears to show authentic looking replicas. I just can't make contact with anyone at that business.
When gas prices go up, buy more gas and buy less food. That's my solution every time I pause to consider a 5 speed in big red.
Quote from: deathsled on April 18, 2018, 12:10:48 AM
When gas prices go up, buy more gas and buy less food. That's my solution every time I pause to consider a 5 speed in big red.
^^^^^
when the OPEC oil embargo hit in '73 I traded my '68 VW bug straight across for a used '70 Olds 442 convertible (at the Olds dealership in OKC). I was single and didn't mind gasoline being my biggest monthly expense. Any car with a big V-8 was just being given away, and gas sipping imports were getting top dollar.
that 442 was the last GM product I bought, it was too low and I kept hitting the oil pan every time I crossed the RR tracks. Got tired of removing it and hammering it out where the rods were hitting the inside of it.... Otherwise, a fun car.
Z
Hello
I have a GT 500 with built 427 side oiler stroked to a 488, dyno 592 HP and 609 torque, 389 Detroit locker, installed a Gear vendor, reasonable easy, no mods or cutting, remove tail shaft from 4 spd bolt it on, some wiring, push in clutch hit a button anytime over 40 mph and she goes into over drive. I think from 389 to 260, not that expensive either. Automatically releases under 40 MHP. No issues with handling the torque or HP
Totally changed the car, I love it still has right revs with 389 in 1 st and 2 nd but wow!! on the highway it is fantastic, way lower revs and noise and now instead of the truck lane I shift from 4 th into OD and head straight for the passing lane. I think my speedo only goes to 125 mph and did you know if you keep going needle will come around and start back at 5 mph again, never knew myself. I had so much fun the first ride all I did was go between HWY exits and accelerate the on ramps up into OD, probably 10 times it was exhilarating!! I simply Love it a whole new car
It works seamlessly, feels totally comfortable and wish I had done it 30 years ago when I bought the car. So now I can bang the gears and get great acceleration head out on the highway and pretty well pass anybody, No pictures handy.
Very interesting that it automatically disengages below 40.
How does it determine the speed?
Quote from: Doog 427 on April 23, 2018, 10:07:26 PM
Hello
I have a GT 500 with built 427 side oiler stroked to a 488, dyno 592 HP and 609 torque, 389 Detroit locker, installed a Gear vendor, reasonable easy, no mods or cutting, remove tail shaft from 4 spd bolt it on, some wiring, push in clutch hit a button anytime over 40 mph and she goes into over drive. I think from 389 to 260, not that expensive either. Automatically releases under 40 MHP. No issues with handling the torque or HP
Totally changed the car, I love it still has right revs with 389 in 1 st and 2 nd but wow!! on the highway it is fantastic, way lower revs and noise and now instead of the truck lane I shift from 4 th into OD and head straight for the passing lane. I think my speedo only goes to 125 mph and did you know if you keep going needle will come around and start back at 5 mph again, never knew myself. I had so much fun the first ride all I did was go between HWY exits and accelerate the on ramps up into OD, probably 10 times it was exhilarating!! I simply Love it a whole new car
It works seamlessly, feels totally comfortable and wish I had done it 30 years ago when I bought the car. So now I can bang the gears and get great acceleration head out on the highway and pretty well pass anybody, No pictures handy.
FYI interesting testimonial on Gear Vendor. It sounds great. I will have to pass that along. FYI you can send off your or other generic 120 speed and have it's face re silkscreened and calibrated for 140MPH like typical GT500's.
gear vendor has sensor in it like speedo, taken off Tranny to register speed and turn off under 40 MPH, also little computer and power unit with switch somewhat hidden under dash..... I have a real Shelby so Speedo is 140 MPH then, I forget more often these days, so if needle went around to 5 mph then I was going far too fast, even if for a few seconds, ...
Since you're looking for options, there is another way to go. I have a Richmond Super Street 5-speed behind my B351 with a 3.50 rear gear. 5th gear in the Richmond is 1:1 but first gear is 3.27 so you get the same torque multiplier effect as an overdrive transmission with a low (numerically high) ring & pinion. The part number for the one I'm using is 7041710A with a Ford 1-1/8" 26 spline input. You will have to fabricate a different transmission mount and cut the driveshaft, so that may not be something you want to get into. If you want more info or pics let me know.
$2721 at Jegs https://www.jegs.com/webapp/wcs/stores/servlet/m20ProductDisplayView?catalogId=10002&langId=-1&productId=50192&storeId=10001 (https://www.jegs.com/webapp/wcs/stores/servlet/m20ProductDisplayView?catalogId=10002&langId=-1&productId=50192&storeId=10001)
~Kevin
Quote from: zray on April 17, 2018, 09:42:22 AM
Quote from: Brandon on April 16, 2018, 11:19:57 AM
67 GT500
Thinking about options to stop running 4K RPMs on the freeway on a regular basis......."
In your shoes, this would be my preferred order of options:
1) do nothing. your car is not being damaged, or subject to accelerated wear by running it @ 4,000 rpm. If the trip requires it, your BB can run all day long at 4,000 rpm and then do it again day after day. It's not abuse, it's exercise. I like highway cruising at 3,500 to 4,200 rpm and have spent many full days traveling running those numbers. No need to downshift when passing, and the engine is making beautiful music in the midrange.
2) change the rear end gearing to 3.50. just buy a complete 3.50 pumpkin and in 2 hours you will be done with the swap. That will drop the rpm down to 3,500 more or less, which may be less objectionable. Your low rpm torque will not dramatically be changed.
3) a 5 or 6 speed swap is giving up too much of the 1960's character of the car for my liking. You might as well go al the way and just put all Shelby Mustang sheet metal on top of modern underpinnings and be done with it. However, many people love it. IMO, driving modern cars has ruined their perspective.
In other words, they have gotten soft.
Z
Very well articulated and I have to agree.
Sorry it's taken so long to respond. I can't find the pictures I had of the Gear Vendors installed in my 69 GT350 I believe they were on my last phone that got destroyed in an accident. I'll try to take some when I get a chance and post them
Dan
Quote from: Doog 427 on April 23, 2018, 10:07:26 PM
Hello
I have a GT 500 with built 427 side oiler stroked to a 488, dyno 592 HP and 609 torque, 389 Detroit locker, installed a Gear vendor, reasonable easy, no mods or cutting, remove tail shaft from 4 spd bolt it on, some wiring, push in clutch hit a button anytime over 40 mph and she goes into over drive. I think from 389 to 260, not that expensive either. Automatically releases under 40 MHP. No issues with handling the torque or HP
I thought you had to cut the driveshaft?
Yes, need shorter drive shaft kept orig and had new one made
+1 for Gear Vendors.
My KR has a 427 side-oiler punched out to 468 cubes; made 580 hp and 607 torque on DenBeste engine dyno.
Stock 3.50 Traction-Lok.
Stock Toploader.
Custom (shorter) driveshaft. (Replaced the Dead Nuts On driveshaft because I didn't want to cut it.)
The revs at 75 with GV OFF is an indicated 3450 RPM. With GV ON they drop to about 2700 RPM. The speedometer and tach were recalibrated three years ago, but I can't swear they are 100% accurate.
I agree that you can spin a good BB all day long at 4000 rpm, but I guess I am getting a bit soft because I simply like the lower revs when I'm cruising on the freeway.
I do track the car occasionally at club events, and sometimes use the GV to lengthen the pull on a long straight without revving it to the moon. It's not a race car, but it has a lot of power and the extra leg length of the GV just makes it that much more adaptable to use.
Unit has been bulletproof so far. Super easy to use. I installed a Hurst T-handle shift knob with thumb-button to switch the unit on/off.
(BTW: I have no association with Gear Vendors. Just a satisfied customer.)
Do you push in the clutch to engage O.D?
Is there exposed wiring on your Hurst shifter lever arm?
You can pick your final O.D. Ratio, correct?
Yes, push in the clutch WHILE engaging or disengaging O.D. Push the button, then let out the clutch.
I cut a groove along the length of the shifter, and recessed the wire. I can feel it with my finger, but can't see it, when seated.
I believe all of the GVs have the same ratio. 0.80 IIRC.
BTW: Mine has a Hurst shifter lever arm too. I didn't cut up an original one.