My transmission shifts hard from park to reverse and nuetral to drive.Making the car jump foward .I am around 750 rpm's in park and 550 in drive.I just bough the car and I am not sure if it has a shift kit upgrade.To be honest it doesn't bother me I just don't know if this hard shifting is hard on the diff.
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Quote:
Maybe the engine/trans mounts?Originally Posted by bayman
My transmission shifts hard from park to reverse and nuetral to drive. Everything else is working properly, Any ideas? 
Member
make sure your idle speed isn't too high, could also be u-joints.
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Brisk
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Feb 24, 2021
- Join DateJul 2004
- LocationBeautiful BC
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- Car'88 IROC-Z / '91 Z28 / '91 GTA
- EngineLT4 Hot Cam 305 / L98 355 / MR 383
- Transmission5-spd / 700R4 / 700R4
- Axle/Gears3:45 / 3:23 / 3:23
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I'd say check for excessive play (worn out) on your u-joints on the driveshaft first
What year is the transmission? What is the idle speed when this happens?
Junior Member
I to have this problem, 86 IROC 305TPI. rpm approx 500-600. Trannie mount replaced when having service/flush etc of transmission.
Will check driveshaft next time in shed.
Will check driveshaft next time in shed.
The 1982-1986 units did not have the forward accumulator and the cushioned reverse that the 1987 and later units had. Therefore the harsher neutral to drive and reverse engagements.