I run AC-Delco GL-4 in mine at the moment and it was formulated for the Vette/Cad T-56 transaxles. I'm very pleased with the performance and I'm very hard on the synchros. About to make the leap into rebuilding my own T-56s.
If you drive a lot in traffic, especially freeway stop 'n go, you'll be better off with the heavier wheel. The light one is more prone to bucking - for sure with a 708, or hotter cam.
Saturday, I cleaned the transmission tunnel and rear subframe/diff/seatback partition area on the lift. The engine is out for a hone and rings and the trans came out with it. Some nights this week, I'll detail the engine compartment and suspension links. Rear shocks are coming out for new shaft...
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