Hello,
my girlfriend owns an 1954 GMC 3100 with an hydra-matic transmission attached to a 235 chevy engine(truck had a 248 original). We got the 235 swapped from a friend as it was good and running and the 248 was completely junk.
I have a question regarding a drasitc rpm drop of the motor when I put it gear 1-4, 1-3, R.
When I put it in 1-2 it stalls the motor. The idle speed of the motor in neutral is about 370 rpm.
Does anyone have an idea what might cause this (break bands not set correctly etc...)?
The truck is a frame off restoration and is road ready since about 6 weeks.
I would appreciate any hint that might help me to get the problem solved.
Thank you, Mario