Powerglide no Reverse
Like the title says. Shifting into reverse is like shifting into neutral. Previous owner indicated that it had been that way for some time; I want to diagnose and fix it. 1966, aluminum pg, rear pump. I've already checked the fluid level many times, even slightly overfilling it to no avail.
One thing I read somewhere is that the fluid port that controls the reverse clutch can become blocked with debris over time. On an off chance, I tried some Seafoam trans-tune, which didn't fix the problem. Also read that sometimes rebuilders will install the gasket for a later pg with no rear pump, blocking off the fluid port. Don't know if the trans has ever been rebuilt, but I doubt it.
Checking the fluid port would I believe require me to drop the transmission, somewhat difficult given that I don't have access to a lift. If I'm going to do that job, I want to be sure that it will fix the problem. Does anyone have experience with this problem? Any leads on things I might check? I don't have the money for a new transmission right now, although that's my eventual goal.
1966 Impala 4-door Sedan
283 V8, 2 speed Powerglide Automatic