G.M. used New Process 540 transmissions both direct & overdrive models. (An uncle had a '66 GMC 4000 351 V6 with O.D. , another had a "66 C60 366 with a direct 5th.

540GO14
6.05:1 1st

3.31:1 2nd

1.84:1 3rd

1.00:1 4th

0.82:1 5th

6.86:1 Rev

Last edited by BC59; 11/15/2021 9:03 PM.
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