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#1
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Replacement clutch (size/splines)?
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) |
#2
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I think it's 10 spline and 10.5" flywheel bolt pattern.
The Muncie M-22 would be the finer spline.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#3
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I run a Centerforce dual friction, 10.5", 10 spline.
My Super T-10 was a fine spline, same clutch. I like them.
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"Those poor souls have made the fatal mistake of surrounding us. Now we can fire in any direction" 1970 Trans Am RAIII 4 speed 1971 Trans Am 5.3 LM7 1977 Trans Am W72 Y82 1987 Grand National |
#4
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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.
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
#5
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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) |
#6
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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.
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#7
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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
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1970 Formula 400 Carousel Red paint on Black standard interior A no-engine, no-transmission, no-wheel option car. Quite likely one of few '70 Muncie three speed Formula 400's left. 1991 Grand Am: 14.4 @ 93.7mph (DA corrected) (retired DD, stock appearing) 2009 Cobalt SS: 13.9 @ 103mph (current DD; makes something north of 300hp & 350ft/lbs) |
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