NVG3500 (bellhousing is frt half of case) uses G.M. 12345349 fluid, NVG 4500 (case iron man housing, separate bellhousing) uses G.M. 12346190 (Castrol syn-torq).
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
