so i have been helping a friend try and fix his 1969 chevy c20 it has a 396 and a th400 in it. yeah i know it's a chevy but you guys know lots of things. well we rebuilt the carb and put a factory fuel pump on it. we changed the transfluid and the oil. the reason we put a mechanical fuel pump back on was because it seemed to be dieing when he was driving it (it had an electric pump because the rod was jamed). well we got it all back together and took it for a test drive and now it seems to be stalling when it is put in gear. in neutral and park it idles fine but in gear not moving it acts like it has a really hot cam. it didn't do this when he first got it. i'm thinking that maybe the torque converter may be sticking and causing problems. if any one has another idea let me know.
torque converter can't stick, if it did, your engine wouldn't turn over. My bet is you ether have a vacuum leak, clogged fuel filter/screen, or an issue with your carb....
yeah i started doing some thinking about it last night and a vacuum leak sounds about right. that would explain all the problems it is having.
well chevys are pretty stupid. my neighbor who used to work for a chevy dealership back in the 60's walked over and helped me figure it out. there is a stainless steal gasket that needs to be under the carb to stop the exhaust gasses in the cross over from getting in the carb. i didn't put it back in when i installed the rebuilt carb.
yeah i thought it was that someone had stacked a bunch of gaskets under the carb so like normal i removed them and installed the new gasket. boy was i wrong that caused alot of headache.
In terms of the transmission, was is broken down, inspected, and reassembled? If so, were all the parts looked over very meticulously? Its kosher in park and neutral. Will it go into reverse? If you're confirming power-flow through the transmission in P and N, but it will not engage into ANY forward gear (or reverse for that matter) it could be valve, valve body or clutch related (not sure what Chevy's terminology is - but I say forward clutch when refering to the clutch pack that is turned 'on' in the front of the transmission in all forward driving speeds). Any noises? Whining, growling, gnashing? You changed the fluid so Im assuming you checked the pan for any abnormal pieces of debris (i.e., large chunks of metal).
