Thanx, E!
Right now, I've got SAE 75W-140W Synthetic Gear Oil in the tranny, SAE 85W-140W Gear Oil in the rear end and SAE 10W-30 SJ oil in the engine. Synthetic is only in the tranny to make it shift easier when it's hot. I haven't been loyal to any particular brand. Pennsoil and Valvoline are two of the brands I've used.