1990 chevy g30 needs fluid change. What would you recommend?
Mobile 1 75-90 synthetic gear lube. Frank
"What would you recommend? "
I would recommend that you take it to a trusted service facility and let them make that determination. Any shop worth it's salt will explain the whys and wherefores about lubrications for a rear differential. It should start with a curious inspection and proceed from there. Given the age of the rig a rebuild may be in order. ::)
1990 chevy g30 needs fluid change. What would you recommend?
Do you have an owner's manual for the G30?
Use what the manual calls for. SAE 80W-90 . 75W-90 synthetic can be substituted.
Larry