| Input/output shaft information | ||||||
| Years: | Tranny: | Number Of Input Shaft Rings: | Number Of Input Shaft Splines: | Tooth Count: | Number Of Output Shaft Splines: | |
| 1963-1965 | M-20 | 0 | 10 | 24 | 27 | |
| 1966-1970 | M-20 | 2 | 10 | 21 | 27 | |
| 1970-1974 | M-20 | 2 | 26 | 21 | 32 | |
| 1963-1970 | M-21 | 1 | 10 | 26 | 27 | |
| 1970-1974 | M-21 | 1 | 26 | 26 | 32 | |
| 1967-1970 | M-22 | 0 | 10 | 26 | 27 | |
| 1970-1974 | M-22 | 0 | 26 | 26 | 32 | |
| Casting numbers (on case) | ||||||
| Years: | casting number: | |||||
| 1963 | 3831704 | |||||
| 1964-1965 | 3851325 | |||||
| 1965-1967 | 3885010 | |||||
| 1968-1970 | 3925660 | |||||
| 1970-1974 | 3925661 | |||||
| Ratios: | ||||||
| Years: | Type | 1st | 2nd | 3rd | 4th | Rev |
| 1963-1965 | M-20 | 2.56 | 1.91 | 1.48 | 1.00 | 3.16 |
| 1966-1974 | M-20 | 2.52 | 1.88 | 1.46 | 1.00 | 3.11 |
| 1963-1974 | M-21 | 2.20 | 1.64 | 1.28 | 1.00 | 2.27 |
| 1967-1974 | M-22 | 2.20 | 1.64 | 1.28 | 1.00 | 2.27 |