Dazed and Confused
Join Date: May 2012
Location: Upstate New York
Re: 1967 C4 first gear problem
Might be due for a rebuild and a new converter, how's the fluid look? Being warm is part of the clue, if the pump in the coverter is shot or the fluid contaminated, or the filter is beginning to plug, the warmer fluid's viscosity will thin somewhat making it easier to build pressure. Try changing the fluid and filter first to see if it alleviates the problem.
Ever notice that there's so many high performance parts available for GM products?
Did you ever think that maybe they NEED them?