tranny fluid

I have a 1990 chevy 1 ton with a dump bed. 350 v-8 4 speed manual .
I changed the tranny fluid today.
I used pennzoil syncromesh. The owners manual didn't have crap about capacities, Does anyone know how many quarts it takes and did i use the right stuff. The parts store guy got the syncromesh out of a computer. I put in 4 quarts. Should i fill it up to the fill plug?

Thanks

Jeff

Which tranny do you have?

I have the factory manuals for 90 and they list 2 4 speed manual transmissions:

HM-117
New Process

Both hold 4.2 quarts; however, the HM-117 uses Manual Transmission Fluid while the New Process uses Dexron II Automatic Transmission Fluid.

I always fill to the fill plug for manual transmission/transfer cases.

//2000CAYukon