1967 GMC 930 Manual Trans Fluid?

[kwmech]

Originally Posted by 1970cstblazer

GL-4 80w90

Right there. Have found out a couple of times when a customer has had their vehicle serviced elsewhere and then starts experiencing shifting issues. Drain and fill with GL-4. The GL-5 is too slippery for the brass rings to grab the gear and slow it down

[jumpsoffrock]

Originally Posted by kwmech

Right there. Have found out a couple of times when a customer has had their vehicle serviced elsewhere and then starts experiencing shifting issues. Drain and fill with GL-4. The GL-5 is too slippery for the brass rings to grab the gear and slow it down

Where do you pick up your GL-4, mech?