Also, according to GM, ~03-04 newer hardened 4th clutch shafts were introduced from the factory. This true?
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03-16-2008
Also, according to GM, ~03-04 newer hardened 4th clutch shafts were introduced from the factory. This true?
03-16-2008
Originally Posted by Sabrewings
Thats a good question since Dave recently saw the inside of my transmission.
03-17-2008
The 03/04+ 4T65E transmissions did come factory with the hardened 4th clutch hub. Lee, yes yours does have one in it so you dont need to worry about it. Scotty I have never seen a heat treated one fail, even with well over 100K miles on them. I use aftermarket shafts and have also seen used ones from one of my suppliers as they will sell the used hardened shafts and I a didnt even see any of those that looked worn.
03-17-2008
Synthetic shield: I think I agree with you as far as... is heat treating the splines realy the answer, considering they are still as paper thin to start with.
I really believe the culprit isn't the splines because for one they never used to strip out on the 4t60e models, so either they are making the new 4th clutch models out of crappy metal, or we have an issue with the trans operation that is causing excessive wear on these splines. Example... 4th maybe needs a cushion spring to absorb the impact, or maybe 4th isn't calibrated correctly? My opinion is they really screwed up on this design and I don't think it's fixable only prolongable if that is a real word.
03-17-2008
Yeah the older 440T4s and 4T60Es didnt see this near as often and was the clutch end that would get chewed up more. One thing I have noticed on the 65s if that the minivans and 60deg V6 cars go through these shafts more often. Its one of those gray areas but I always felt that those cars cyclined in and out of 4th under load a lot more frequently which is going to hammer on the splines more and cause them to fail sooner. Regardless the newer shafts seem to address the problem and I havent seen one come back nor have I had anyone tell me about one failing.
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