[98 SNAKE EATER]

Looking for a replacement clutch for one of my 70 T/A's

I had picked this car up last year and whatever is in her feels fine for daily driving, but is weak compared to the Hays I have in my other 70 T/A

It had decent pedal pressure and zero issues powershifting all day getting rubber in every gear.

Thing is, it's been probably 25+ years since I installed it and can't remember the details.

Pretty sure the PP was gold, but don't see a current listing for a gold PP (only black or orange)


Couple of questions:

1) Is it 10.5 or 11 inch? (pretty sure it's 10.5)

2) 10 spline or 26 spline? (I'm thinking 10 spline, but not sure)

[johnta1]

I think it's 10 spline and 10.5" flywheel bolt pattern.
The Muncie M-22 would be the finer spline.

[72projectbird]

I run a Centerforce dual friction, 10.5", 10 spline.

My Super T-10 was a fine spline, same clutch. I like them.

[unruhjonny]

in 1970 I believe that everything except for the M22 behind the 454 LS6 was the "coarse" (or ten tooth) spline input shaft;
GM changed ALL passenger car four speeds to the "fine" (or twenty-six tooth) spline input shaft for 1971.
Trucks and passenger car three speeds continued using the coarse spline input shaft after 1970.

I have read several times that M22 was always fine spline, but that is plain incorrect (I mean you no disrespect John).

As far as I am aware Pontiac always used a 10.4" (often referred to as a 10.5") clutch for the 400's or smaller;
I believe that the 11" clutch was used for 455's.

Now, I don't know anything about your car, so you might be best off getting your transmission out before you buy a clutch;
It's possible that you could have an 11" clutch flywheel on you engine, and you could have a later transmission, or a fine spline setup in your original main case;
The fine spline gear setup requires a different tail housing that uses a TH400 sized output shaft (as opposed to the TH350 output shaft that was with the coarse spline input shaft).

I ran a Centerforce dual friction clutch in my car, and although there was a little more pedal effort, I found it wasn't nearly as bad as some sources cited.

[98 SNAKE EATER]

Took a peek at my other 70 T/A's trans and it's 10-spline



I could only assume it's the same for this 70, but I agree it would be best to pull it first before ordering

Problem is I can't afford the downtime as I only get to see her a few weeks out of the year (I live in NY and keep all my toys in FL)

[johnta1]

That flywheel in the pic looks like a dual pattern, which could use either 10.5" or 11" clutch. I'd say a 10.5" clutch would be a safe bet on yours.

[unruhjonny]

I you have a spare flywheel, then I see a potential problem to the unknown in your car's drivetrain;
Get that one resurfaced, in preparation for installing on your TA.

The only other possible variable (although this is unlikely is if you have a correct engine) is a later (lighter) crank was used - those cranks use a different flywheel because of a different hub.

Not too many people are fortunate enough to have more than one '70 TA