I drove my 88 IROC (All stock L98/700R4/Al Driveshaft/2.77 posi) on a road racing course on Saturday. About halfway through the day, I noticed that when I move the shifter into a "moving" gear (drive, reverse) there is a clunk/jerk in the drivetrain as if something has slop and putting it into gear tightens it up.

Understand that I often had to slam the car into second gear when heading into a turn and there is no way to soften the blow to the drivetrain (no heel/toe, etc).

I suppose it could be anything from the tranny through the rear end. Is there a known weak point in this layout? In what order should I do my search? Thanks.

 

Anyone?

 

When road racing an automatic, you can try a left foot braking technique. With your right foot on the gas, you can sort of help the engine match revs, the same concept as heel toeing a manual.

As for your clunking, check the driveshaft at the axle, and keep in mind, some of this slop is normal.

 

Thanks. I'll have a look.

Maybe I should also try the automatic transmission of heel-n-toe. I know I'm tearing the old girl up... ...but it's so fun!

 

Road racing is the best, if you're ever in the Detroit area, check out Waterford hills.
here's the website.
www.waterfordhills.com