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Note: There was a TH375 made that shared all the internals and case of a 400, but had the output shaft of a 350!
For more indepth information on GM transmissions use this link Drivetrain Tech
For GM transmissions dimensions use this link
Dimiensions
Transmission 1st 2nd 3rd 4th Reverse Powerglide 1.76 1.00 N/A N/A 1.76 TH350 2.52 1.52 1.00 N/A 1.93 TH400 2.48 1.48 1.00 N/A 2.00 2004R 2.74 1.57 1.00 0.67 2.07 700R4 3.06 1.62 1.00 0.70 2.29 4L60E 3.06 1.62 1.00 0.70 2.29 4L80E 2.48 1.48 1.00 0.75 2.08
| Transmission | Year | 1st | 2nd | 3rd | 4th | Input | Output |
| M20 | 63-65 | 2.56 | 1.91 | 1.48 | 1.00 | 10 | 27 |
| M20 | 66-70 | 2.52 | 1.91 | 1.48 | 1.00 | 10 | 27 |
| M20 | 71-74 | 2.56 | 1.91 | 1.48 | 1.00 | 26 | 32 |
| M21 | 63-70 | 2.20 | 1.64 | 1.28 | 1.00 | 10 | 27 |
| M21 | 71-74 | 2.20 | 1.64 | 1.28 | 1.00 | 26 | 32 |
| M22 | 63-70 | 2.20 | 1.64 | 1.28 | 1.00 | 10 | 27 |
| M22 | 71-74 | 2.20 | 1.64 | 1.28 | 1.00 | 26 | 32 |
| Transmission | 1st | 2nd | 3rd | 4th | 5th |
| T-10 | 2.64 | 1.61 | 1.23 | 1.00 | N/A |
| T-10 | 2.88 | 1.74 | 1.33 | 1.00 | N/A |
| T-10 | 3.44 | 2.28 | 1.46 | 1.00 | N/A |
| T-5 | 2.95 | 1.94 | 1.34 | 1.00 | 0.63 |
| T-5 (Close Ratio) | 2.75 | 1.94 | 1.34 | 1.00 | 0.74 |
| The grooves are found on the input shaft. | |||||
| # of grooves | 1st | 2nd | 3rd | 4th | Notes: |
| 0 | 2.85 | 2.02 | 1.35 | 1.00 | |
| 1 | 2.56 | 1.81 | 1.37 | 1.00 | Third gear on cluster has 25 teeth |
| 1 | 2.56 | 1.81 | 1.44 | 1.00 | Third gear on cluster has 21 teeth |
| 2 | 3.11 | 2.20 | 1.47 | 1.00 | |
| 3 | 3.50 | 2.48 | 1.65 | 1.00 | |
