Author Topic: The day the music died  (Read 1864 times)

deathsled

  • SAAC Member
  • Hero Member
  • *
  • Posts: 2381
    • View Profile
The day the music died
« on: July 25, 2021, 11:21:01 AM »

I was out on an early morning drive at 06:00 today traveling though misty patches which added to the mystique of driving a Shelby Mustang almost as old as me. I got up to 70 mph and the engine was screaming 4,000 rpm which perhaps is normal for a 3:50 rear end. I noticed a vibration which I attributed to the rear trap door but at home I saw my side exhaust pipe on the driver's side was lightly touching the body. Underneath, the glass pack was sagging lower in the middle. Other side is fine. I must've lost a clamp. Anyone have any similar issue before? So the music has died. For now.
Going to jack her up when the sun begins to set.  Too damn hot to be laying on a black asphalt driveway.  It should be something very simple.  I will just do a side by side comparison with the right exhaust.
« Last Edit: July 25, 2021, 01:45:11 PM by deathsled »
"Low she sits on five spoke wheels
Small block eight so live she feels
There she's parked beside the curb
Engine revving to disturb
She's the princess from his past
Red paint gold stripes damned she's fast"

68GT350roadracer

  • Full Member
  • ***
  • Posts: 121
    • View Profile
Re: The day the music died
« Reply #1 on: July 25, 2021, 05:03:58 PM »
I always sang the song drove my Shelby to the Levee.

Side-Oilers

  • SAAC Member
  • Hero Member
  • *
  • Posts: 1772
  • SAAC member since 1981.
    • View Profile
Re: The day the music died
« Reply #2 on: July 25, 2021, 08:06:34 PM »

I was out on an early morning drive at 06:00 today traveling though misty patches which added to the mystique of driving a Shelby Mustang almost as old as me. I got up to 70 mph and the engine was screaming 4,000 rpm which perhaps is normal for a 3:50 rear end. I noticed a vibration which I attributed to the rear trap door but at home I saw my side exhaust pipe on the driver's side was lightly touching the body. Underneath, the glass pack was sagging lower in the middle. Other side is fine. I must've lost a clamp. Anyone have any similar issue before? So the music has died. For now.
Going to jack her up when the sun begins to set.  Too damn hot to be laying on a black asphalt driveway.  It should be something very simple.  I will just do a side by side comparison with the right exhaust.

4000 rpm @ 70 sounds too high too me for 3.50s.  Sure you don't have a lower gear, or perhaps short sidewalls?   

I've had non-modified cars with 4.11s that ran 4000 rpm at 80 mph.
Current:
1968 GT500KR owner since 1982 (now running Shelby aluminum 427 S-O)
Kirkham Cobra 427

deathsled

  • SAAC Member
  • Hero Member
  • *
  • Posts: 2381
    • View Profile
Re: The day the music died
« Reply #3 on: July 25, 2021, 10:05:07 PM »
The car has Klutt's close ratio Toploader racing transmission with the Richmond gears.  Maybe the tachometer is reading incorrectly?  The tires on the car are currently 215 60R 15 in the rear and 210 60R 15 in the front.  Suggestions?
"Low she sits on five spoke wheels
Small block eight so live she feels
There she's parked beside the curb
Engine revving to disturb
She's the princess from his past
Red paint gold stripes damned she's fast"

cobrakidz

  • Newbie
  • *
  • Posts: 14
    • View Profile
Re: The day the music died
« Reply #4 on: July 25, 2021, 10:53:51 PM »
Literally blew out my glass packs on the way to mini nats years ago - long noisy drive.  haha

deathsled

  • SAAC Member
  • Hero Member
  • *
  • Posts: 2381
    • View Profile
Re: The day the music died
« Reply #5 on: July 25, 2021, 11:03:24 PM »
I always drive with ear plugs.  Problem solved in that area.
"Low she sits on five spoke wheels
Small block eight so live she feels
There she's parked beside the curb
Engine revving to disturb
She's the princess from his past
Red paint gold stripes damned she's fast"

98SVT - was 06GT

  • SAAC Member
  • Hero Member
  • *
  • Posts: 1439
    • View Profile
Re: The day the music died
« Reply #6 on: July 25, 2021, 11:33:20 PM »
A coat hanger will fix that right up - lots cheaper than the job specific bailing wire.
Previous owner 6S843 - GT350H & 68 GT500 Convert #135.
Mine: GT1 Mustang Track Toy, 1998 SVT Cobra, Wife's: 2004 Tbird
Member since 1975 - priceless

deathsled

  • SAAC Member
  • Hero Member
  • *
  • Posts: 2381
    • View Profile
Re: The day the music died
« Reply #7 on: July 26, 2021, 11:30:03 AM »
A coat hanger will fix that right up - lots cheaper than the job specific bailing wire.
Jacked up. Looks like there are only two attachment points. I'm just going to take red to a shop and throw her on a hoist and let them figure it out. I can't do everything in this life.
"Low she sits on five spoke wheels
Small block eight so live she feels
There she's parked beside the curb
Engine revving to disturb
She's the princess from his past
Red paint gold stripes damned she's fast"

66S285

  • Jr. Member
  • **
  • Posts: 57
    • View Profile
Re: The day the music died
« Reply #8 on: July 26, 2021, 03:05:49 PM »
The car has Klutt's close ratio Toploader racing transmission with the Richmond gears.  Maybe the tachometer is reading incorrectly?  The tires on the car are currently 215 60R 15 in the rear and 210 60R 15 in the front.  Suggestions?

I had a similar issue with the orginal tach; it shows much higher RPM for a given speed than I thought.  Put in an aftermarket tach and now with 3.50 at 70 mph runs arounds 3200 rpm.  the difference is most dramatic at lower rpm's.  above 4000 the tachs are similar
66S285
68 KR #2375

Side-Oilers

  • SAAC Member
  • Hero Member
  • *
  • Posts: 1772
  • SAAC member since 1981.
    • View Profile
Re: The day the music died
« Reply #9 on: July 26, 2021, 04:07:25 PM »
The car has Klutt's close ratio Toploader racing transmission with the Richmond gears.  Maybe the tachometer is reading incorrectly?  The tires on the car are currently 215 60R 15 in the rear and 210 60R 15 in the front.  Suggestions?

I had a similar issue with the orginal tach; it shows much higher RPM for a given speed than I thought.  Put in an aftermarket tach and now with 3.50 at 70 mph runs arounds 3200 rpm.  the difference is most dramatic at lower rpm's.  above 4000 the tachs are similar

^^+1   

Richard:  Or is it your speedometer?   Or some of both?    Is your 4th gear a 1:1? 
« Last Edit: July 26, 2021, 04:09:18 PM by Side-Oilers »
Current:
1968 GT500KR owner since 1982 (now running Shelby aluminum 427 S-O)
Kirkham Cobra 427

deathsled

  • SAAC Member
  • Hero Member
  • *
  • Posts: 2381
    • View Profile
Re: The day the music died
« Reply #10 on: July 26, 2021, 04:16:55 PM »
^^^
I can't tell if speedo though I did measure it against an unmanned radar gun in the area and 40 mph matched spot on. I don't know if 4th gear is 1:1. I can call Klutt and see if he recalls.
"Low she sits on five spoke wheels
Small block eight so live she feels
There she's parked beside the curb
Engine revving to disturb
She's the princess from his past
Red paint gold stripes damned she's fast"

Side-Oilers

  • SAAC Member
  • Hero Member
  • *
  • Posts: 1772
  • SAAC member since 1981.
    • View Profile
Re: The day the music died
« Reply #11 on: July 26, 2021, 04:59:59 PM »
I'd bet it's 1:1, but you never know in a race setup.  Just wanted to cover the revving possibilities.

Try the speed trap radar at 70 and see what it says.   8)
Current:
1968 GT500KR owner since 1982 (now running Shelby aluminum 427 S-O)
Kirkham Cobra 427

FL SAAC

  • SAAC Member
  • Hero Member
  • *
  • Posts: 10934
  • original posts more than McDonalds over 1 billlion
    • View Profile
Re: The day the music died
« Reply #12 on: July 26, 2021, 06:38:35 PM »
First let me say that I am not a doctor nor do I portray one on TV.

But if a where an M.D. by the symptoms explained by the patient,  I would say the malady would be ujointitis ooooor weightoff driveshaftism.

Check both u joints or loss of a weight on drive shaft. Take two aspirins and contact me in the morning after 9:30 a.m.
These cars are meant to be driven so enjoy the hell out of all of it. Not just the look of it when its all cleanCS

A person without a sense of humor is like a wagon without springs.It's jolted by every pebble on the road

Florida S.A.A.C Love All-Serve All, Take Time To Be Kind

I have a UNGOLD car

deathsled

  • SAAC Member
  • Hero Member
  • *
  • Posts: 2381
    • View Profile
Re: The day the music died
« Reply #13 on: July 26, 2021, 06:55:35 PM »
Well there is some vibration at 60 plus mph. I had considered getting the driveshaft balanced.
"Low she sits on five spoke wheels
Small block eight so live she feels
There she's parked beside the curb
Engine revving to disturb
She's the princess from his past
Red paint gold stripes damned she's fast"

FL SAAC

  • SAAC Member
  • Hero Member
  • *
  • Posts: 10934
  • original posts more than McDonalds over 1 billlion
    • View Profile
Re: The day the music died
« Reply #14 on: July 26, 2021, 07:38:05 PM »
Well there is some vibration at 60 plus mph. I had considered getting the driveshaft balanced.

Oh heck easy fix, keep it under 59 MPH
These cars are meant to be driven so enjoy the hell out of all of it. Not just the look of it when its all cleanCS

A person without a sense of humor is like a wagon without springs.It's jolted by every pebble on the road

Florida S.A.A.C Love All-Serve All, Take Time To Be Kind

I have a UNGOLD car