Posted by T.L. on December 06, 1998 at 14:46:48:
In Reply to: C4 tranny improvement...harder shifts for pocket change! posted by David Blodgett on December 06, 1998 at 00:01:46:
That's interesting; my C-4 always shifted really hard in completely stock form and I've always loved that. But I realize that not all C-4s shift as hard as mine. My tranny has a problem with "free-wheeling" between 2nd & 3rd when going from 5-10 MPH (such as in a parking lot). That's the only time it does it and otherwise it works great. Any thoughts??...
: Going through some books in the local library, I found an article on modifying a C4 for harder, firmer shifts that will cost only a few dollars. It is done by increasing fluid pressure from 65-70psi to in excess of 100psi. All you need is a new gasket, filter, and a small cotter pin. The modifications can be done WITHOUT removing the trans from the car ( a huge plus ). I'm going to scan the article as soon as I can check out the book again. If you would like a copy of the article, send me an email.