[G.A.S.]

engine I dont know. I think the 87 took 6 quarts. is there something wrong with the dipstick?
trans has a fill and a drain plug same as the rear and front axels.
those get filled through the fill plug hole untill the fluid just starts to drain out the hole.
Flush with the bottom of the fill hole while the vehical is level.
they make magnetic drain plugs for the trans that are benifical too.