Originally Posted by Phak1
You’re Welcome! Full Synthetic may be too slippery for the syncro's to operate correctly. I would stick with what GM recommended.

X2


BC
1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc
1949 GMC 250 project in waiting
1960 C60 pasture art
Retired GM dealer tech. 1980 - 2022