I recently purchased my IROC - 1987 305TPI - The transmission was rebuilt within the last six months and works fine........except for an extremely hard first - second shift. If I'm accelerating other than a light touch it really bangs into second gear. Now don't get me wrong I like good solid shifts but I'm just not sure whether this is to violent.

Should I be patient with it and let it break in more?

Am I overreacting?

Is it possible to adjust the firmness of the one - two shift without removing the transmission?

I'm really not sure what to think.

 

Adjust the throttle valve cable.

 

+1

But do some research on it. You can destroy the transmission by setting incorrectly.

 

my tranny does the same thing but under wo throttle it wont shift i have to let off for it to shift from one two if i stay in it it spins to 6,000rmps and i dont let it spin any more. any other advice on the throttle valve cable

 

Here is how I adjusted mine by. Pretty good write up.

http://sethirdgen.org/tvcable.htm

 

Thanks for the advice, I'll do the adjustment this weekend and let you know how I make out.

 

I was surprised just how easy the TV cable adjustment was. The shift points are normal now. Again, you folks have been dead on with your advice. Thanks Again