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  #1 (permalink)  
Old 05-08-2010, 10:59 AM
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Pontiac clutch questions

Just wondering if there was or is a difference between a gm application and a Pontiac application. Or will they interchange. I ordered a new clutch kit for my T/A and i ordered a gm 11 inch application, but now it's not working properly. I check my summit book and i ordered centerforce DF148552 which is a standard GM clutch kit said it would work for Pontiac also. But now i have ran into these problems and looked more and found this clutch kit for a Pontiac DF161056 so now i am thinking i ordered the wrong clutch kit to begin with The clutch won't adjust properly now and with the clutch pushed down the wheels are trying to turn so i do't know if i got the wrong clutch kit or if the throwout bearing is not in the fork correctly. The pedal just don't feel right to me at all. any help will be very appreciated.



Cole

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Old 05-08-2010, 05:29 PM
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Well i checked the #s with centerforce and it turns out i do have the correct clutch kit. So i guess i will check the fork and things.


Cole
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Old 05-08-2010, 06:30 PM
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Quote:
Originally Posted by eloc431962
Well i checked the #s with centerforce and it turns out i do have the correct clutch kit. So i guess i will check the fork and things.


Cole
IIRC there are "long" and "short" TOB's, I wonder if that is affecting things? The long brng. is about 1/4"-1/3" longer than the short brng.
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Old 05-08-2010, 06:41 PM
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Ran across THIS just now- it goes into the different lengths of TOB and studs, etc. Hopefully there'll be something that jogs your memory.

Good luck.
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Old 05-08-2010, 06:43 PM
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There are also two or three different length fork pivot balls, and several different forks that could be messing with things. Throw-out bearing length seems like the first place to look.

I'll admit i don't know how all the various lengths of pivot ball, fork, and throw-out bearing match each other, I don't do it often enough, you'll just have to investigate.

Last edited by ericnova72; 05-08-2010 at 07:22 PM. Reason: tree'd on the info
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Old 05-08-2010, 07:18 PM
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Thank's guy's great info, I am planing on taking it back out tomorrow and see what it is. It has a after-market bell-housing on it also. Time to investigate .



Cole
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Old 05-09-2010, 11:03 AM
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Update on throwout bearing

Well i just took the trans back out of the T/A, And so far all i can find is that the TOB they said i would need and i bought is like 3/16 shorter then the original i took out, The old one turns free so i am thinking about putting it back in, Can 3/16 cause this much trouble in the clutch?



Cole
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Old 05-09-2010, 03:00 PM
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Quote:
Originally Posted by eloc431962
Well i just took the trans back out of the T/A, And so far all i can find is that the TOB they said i would need and i bought is like 3/16 shorter then the original i took out, The old one turns free so i am thinking about putting it back in, Can 3/16 cause this much trouble in the clutch?

Cole
I wouldn't think so, but then again it may.

Besides the different TOB lengths, if you take all the differences in ball stud lengths, arms, and being that the bell is aftermarket, all together there may be any manner of misalignment going on.

I just do not know enough about this in non-OEM applications to offer any help. I'll poke around some tonight to see if anything comes to light- I'll be doing a similar swap into my Malibu (TH350 out, M-20 in) so I need to look into it anyway.

I do know there is a different length TOB than the one that came in the TA originally- it will be either shorter or longer by 1/4"-1/3", depending on what was in it OE. I'm not sure of the exact measurement, so the difference you are seeing between the original TOB and the new one may mean there's a third size, or my remembered difference in size is off a little and there's just two sizes...

Anyway, if I see anything, I'll post back.
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Old 05-09-2010, 03:04 PM
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Well i just got it back together and backed out of the garage, And now for the moment of truth i am going to take it down the road.



Cole
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Old 05-09-2010, 03:08 PM
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I just measured my OEM 1968 GTO bell and the stud for the TOB fork is 1-7/8" long. The TOB is 1-1/4" thick, front to back.

I can show a photo of the fork, bell and TOB if it would help.

EDIT- Just saw you are going for a test drive, got my fingers crossed...
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Old 05-09-2010, 03:13 PM
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The Lakewood bell has a spec of 4.75" from the front of the bell to the tip of the pivot ball. If you have a block saver plate also it needs to be incuded in this measurement.

I scanned through the link Cobalt gave to see what was there and it mentioned this 4.75" to pivot ball and that there are 3 throw-out bearing lengths roughly 1/4-3/8" different from each other.
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Old 05-09-2010, 03:28 PM
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My OEM bell also measures exactly 4-3/4" from end of the pivot ball to the block flange.
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Old 05-09-2010, 03:35 PM
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Well i just got back drove like 12 miles and it all went well . Turned out it was the TOB and also cobalt i found out through centerforce they sell a adjustable TOB for short / medium/ long . So i am thinking you were right about the 3 different sizes for the TOB. But all in all it works well for now i will have to put some miles on it and re-adjust the clutch. And thank's cobalt and Eric for all your help i really appreciate it.

Edit= just saw were Eric had found it also about the 3 different legnths.
Cole

Last edited by eloc431962; 05-09-2010 at 03:41 PM.
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Old 05-09-2010, 06:35 PM
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Well i just got back again . This time i went on a short road trip to my son's house about 50 miles round trip and the car did just fine .
As stated before i will just have to put some miles on it and re-adjust the clutch later on and i think it will be fine.
Thank's again Cobalt and Eric for your help.


Cole
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