[supervisor1886]

First of all 50psi is too much. You might have it only when the engine is real cold. max is 45psi for this engine, but most sit around 30 psi when warmed up. Also from my experience the rule of tumb here doesnt apply. If you have proper viscosity oil you should be right in the middle of gage all the time no matter at idle or at 5000 rpm. max difference you should get is 5-10 psi,, more means its just very cold or your have a problem. Blocage in the oil line can cause high oil pressure or bad pump will cause like 5psi oil pressure at idle.

Connect the manual gage to it to see what it does.

You what constant 30 psi at any speed even idle(see broughy84' reply) , but
it should be 45psi at like 5000rpm cold.Or 40 psi when first started. Thats considered normal. (10psi +-) But most healthy 305s GM engines will run 30-35psi all the time with a little difference at high speeds in warm climate. ( 10w-30 oil) If you have some sorta tractor oil and your engine smokes than the numbers will be completely screwed in both directions.

I recomend Seafoam product that (people say) cleans the shit out of engines with only one oil change. ( I heard some people use tranny oil)


The tranny problem is mostly due to low level of oil or sticking valve for the third gear. It needs to be rebuilt
or the valve fitted properly. might also be a converter problem someimes or both. Its tired. Replace with a nice 700r4

I hope it helps.