Happy New Year. After many years of sitting, I am getting back to working on my 1968 Pontiac GTO 400 H.O. Convertible. We are freshening the original engine (rings, bearings, heads) and I have already chosen Amsoil Z-Rod 10W-30 for the engine.
I will also be changing out the automatic transmission fluid (Turbo 400) and am wondering if I should go with the Amsoil Multi-Vehicle ATF or the lighter viscosity offering? The owner's manual requires a Dexron III fluid.
Also, looking to find out your opinions on a gear oil for the original Positraction 3:23 rear end. In a 75W-90 viscosity, do you think I should go with the Severe Gear offering, or the regular Amsoil?
As a restored car, this GTO will be driven only on nice days and fairly gently.
I will also be changing out the automatic transmission fluid (Turbo 400) and am wondering if I should go with the Amsoil Multi-Vehicle ATF or the lighter viscosity offering? The owner's manual requires a Dexron III fluid.
Also, looking to find out your opinions on a gear oil for the original Positraction 3:23 rear end. In a 75W-90 viscosity, do you think I should go with the Severe Gear offering, or the regular Amsoil?
As a restored car, this GTO will be driven only on nice days and fairly gently.