C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Automatic Transmission

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Old Feb 4, 2005 | 08:38 PM
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Default Automatic Transmission

I can't seem to find my transmisson problem in any book. When I shift from Park or Neutral to Drive it shifts very hard. There is a slight delay then it hits. It isn't as bad from Park or Neutral to Reverse but still not quite as smooth as it should be. Are there any suggestions?
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Old Feb 4, 2005 | 08:41 PM
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Check the 1/2 accumulator for a broken spring or leaking piston. The pistons were changed to the current later style in very late 86.
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Old Feb 4, 2005 | 09:02 PM
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After you start the car, lit it idle for a while to bring the RPM down , foot on brake & shift, it is always a little punch !
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Old Feb 5, 2005 | 12:03 AM
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You should also consider worn out u-joints on the drive-shaft and half-shafts. What may be happening is as you put the car into gear, it thumps because the u-joints have slack in them. My car behaves similarly, and I thing I need to replace the u-joints soon.
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Old Feb 5, 2005 | 12:50 AM
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If theyre the original U-joints, that could cause hard shifting into D or R.
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Old Feb 5, 2005 | 02:01 AM
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Originally Posted by 84whitevette
You should also consider worn out u-joints on the drive-shaft and half-shafts. What may be happening is as you put the car into gear, it thumps because the u-joints have slack in them. My car behaves similarly, and I thing I need to replace the u-joints soon.
Bingo! My 89 did the exact same thing; replace them all with Spicer units yesterday. Big difference.
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Old Feb 5, 2005 | 05:01 AM
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Starting in 1987, they started to use a forward accumulator, which made the neutral to drive smoother. If you have the right year, (with forward accumualtion), and it still engages hard, then the forward accumulator is most likely the problem. The 1-2 accumulator has nothing to do with it. If you have any questions on this let me know?
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