Thanks TQ, I went there and looked, which one of these would you and/or Bubbie recommend for my TwinCam trans ?
Heavy ShockProof
Film thickness greater than an SAE 75W250, yet low fluid friction like 75W90
For heavily-loaded racing differentials and transmissions, problem gearboxes
Many performance racing applications like Sprint/Midget/Dirt Late Model Differentials, Detroit Lockers and spools, NHRA Top Fuel and Funny Car rear ends
Not recommended for most synchro applications due to the product's extreme slipperiness
Lightweight ShockProof
Film thickness greater than an SAE 75W140, yet low fluid friction like 80W gear oil or 30W motor oil
Excellent low-temp flow, improved cold shifting
For racing differentials under moderate loads
Popular in racing transmissions like Hewland and other Road Racing dog-ring boxes, Bert and Brinn for Stock Cars, G-Force, and Liberty clutchless for Drag Racing