1970 Mustang with 351-2v question

[Bigfoot]

Factory 4speed, 351-2v 1970 Mustang.
Fastback
Cleveland

What spline in rear?

Thank you

[427heaven]

Biggie- Most were 28 spline,the big block and Bosses got the 31 spline.

[Bill]

Biggie- Most were 28 spline,the big block and Bosses got the 31 spline.

X 2

[Bigfoot]

Thnx guys
Just double checking before I order "up" some gears.
I didn't want to "lead the witness" by offering my guess....

[427heaven]

Biggie- To clarify a couple of things, before you order up some stuff you need to know what posi-locker unit etc is in there. All the 9 inch gears will fit but if you want to UPGRADE say from a peg leg open unit you need to know what else is in there.

[Special Ed]

70 351c 4bbl  had rear sway bar & 2 hole 9'' housing part of the comp suspension  but 2bbl didnt so u need to check housing maybe 8''.

[J_Speegle]

70 351c 4bbl  had rear sway bar & 2 hole 9'' housing part of the comp suspension  but 2bbl didnt so u need to check housing maybe 8''.

Just checked some pictures of a H code 3 speed. It had a 9" in it. But no pictures of the rearend tag so can't help with the spline count

[Special Ed]

28 spline for sure