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Transmission Gear Ratios
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Transmission Ratios : 1| Transmission/Gear | 1st | 2nd | 3rd | 4th | 5th | 6th | Reverse | |
| Powerglide | 1.76 | 1.00 | - | - | - | - | 1.76 | |
| Powerglide | 1.82 | 1.00 | - | - | - | - | | |
| TH200-4R | 2.74 | 1.57 | 1.00 | 0.67 | - | - | 2.07 | | TH350 | 2.52 | 1.52 | 1.00 | - | - | - | 1.93 |
TH400 | 2.48 | 1.48 | 1.00 | - | - | - | 2.00 | | TH700-R4 | 3.06 | 1.62 | 1.00 | 0.70 | - | - | 2.29 | | 4L60 / 4L60-E | 3.06 | 1.62 | 1.00 | 0.70 | - | - | | | 4L80E / 4L80-E | 2.48 | 1.48 | 1.00 | 0.75 | - |
- | | | C4 & C6 | 2.46 | 1.46 |
1.00 | - | - | - | | | 727 | 2.45 | 1.45 | 1.00 | - | - | - | | | 904 | 2.70 | 1.54 | 1.00 | - | - | - | | | Borg-Warner T56 | 2.97 | 1.94 | 1.35 | 1.00 | 0.84 | 0.62 | 3.38 | | | |
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Overall First Gear Ratio :
1 (Tranny Ratio x Rear Gear Ratio)
This indicates the mechanical advantage your car will
have coming off the line - higher number is better (up to a point)
| Tranny/Rear Gear |
2.41 | 2.56 | 2.73 | 3.08 | 3.23 | 3.31 | 3.42 |
3.55 | 3.70 | 3.73 | 3.91 | 4.10 | 4.56 | | PowerGlide | 4.24 | 4.51 | 4.80 | 5.42 | 5.68 | 5.83 | 6.02 | 6.25 | 6.51 | 6.56 | 6.88 | 7.22 | 8.03 | | TH200-4R | 6.60 | 7.01 | 7.48 | 8.44 | 8.85 | 9.07 | 9.37 | 9.73 | 10.14 | 10.22 |
10.71 | 11.23 | 12.49 | | TH350 | 6.07 | 6.45 | 6.88 | 7.76 | 8.14 | 8.34 | 8.62 | 8.95 | 9.32 | 9.40 | 9.85 | 10.33 | 11.49 | | TH400 | 5.98 | 6.34 | 6.77 | 7.64 | 8.01 | 8.21 | 8.48 | 8.80 | 9.18 | 9.25 | 9.70 | 10.17 | 11.31 | | TH700-R4 | 7.37 | 7.83 | 8.35 | 9.42 | 9.88 | 10.03 | 10.47 | 10.86 | 11.32 | 11.41 | 11.96 | 12.55 | 13.95 | |
| 4L80E | 5.98 | 6.35 | 6.77 | 7.64 | 8.01 | 8.21 | 8.48 | 8.80 | 9.18 | 9.25 | 9.70 | 10.17 | 11.31 | |
| Borg-Warner T56 | 7.16 | 7.60 | 8.11 | 9.15 | 9.59 | 9.83 | 10.16 | 10.54 | 10.99 | 11.08 | 11.61 | 12.18 | 13.54 |
Overall Second Gear Ratio :
1 (Tranny Ratio x Rear Gear Ratio)
| Tranny/Rear Gear | 2.41 | 2.56 | 2.73 | 3.08 | 3.23 | 3.31 | 3.42 | 3.55 | 3.70 | 3.73 | 3.91 | 4.10 | 4.56 |
| PowerGlide | 2.41 | 2.56 | 2.73 | 3.08 | 3.23 | 3.31 | 3.42 | 3.55 | 3.70 |
3.73 | 3.91 | 4.10 | 4.56 | | TH200-4R | 3.78 | 4.02 | 4.29 | 4.84 | 5.07 | 5.20 | 5.37 | 5.57 | 5.81 | 5.86 | 6.14 | 6.44 | 7.16 | | TH350 | 3.66 | 3.89 | 4.15 | 4.68 | 4.91 | 5.03 | 5.20 | 5.40 | 5.62 | 5.67 | 5.94 | 6.23 | 6.93 | | TH400 | 3.57 | 3.79 | 4.04 | 4.56 | 4.78 | 4.90 | 5.06 | 5.25 | 5.48 | 5.52 | 5.79 | 6.07 | 6.75 |
| TH700-R4 | 3.90 | 4.15 | 4.42 | 4.99 | 5.23 | 5.36 | 5.54 | 5.75 | 5.99 | 6.04 | 6.33 | 6.64 | 7.39 | | 4L80E | 3.57 | 3.79 | 4.04 | 4.56 | 4.78 | 4.90 | 5.06 | 5.25 | 5.48 | 5.52 | 5.79 | 6.07 | 6.75 | | Borg-Warner T56 | 4.68 | 4.97 | 5.30 | 5.98 | 6.27 | 6.42 | 6.63 | 6.89 | 7.18 | 7.24 | 7.59 | 7.95 | 8.85 |
General Tranny Swap Information:
TH375, TH350, Powerglide, TH200-4R, TH700-R4,
and Muncie M21 all have the same 27-spline output shaft.
TH400 has a 32-spline output shaft.
TH350 and TH200-4R use the same yoke.
TH700-R4 is 3" longer than the TH350 short
tail.
TH700-R4's rear mount is 2" to the rear of
that of the TH350 short tail.
Swapping from a TH350 short tail to a TH700-R4 will require shortening the driveshaft 3".
TH350, Powerglide, and M21 all have the same length and output shaft spline count - therefore, no driveshaft mods required when swapping.
TH350, M21, TH200-4R, and TH700-R4 all use the same tranny mount,
but TH200-4R and TH700-R4 use metric fasteners (M10 x 1.5 x proper length).
Shims may be needed when swapping TH200-R4 in place of TH350 (or
any tranny swap, for that matter) for driveshaft phasing.
Transmission mount or crossmember may need to be relocated fore
or aft for any given swap.
TH200-4R and TH700-R4 have lock-up torque converters (from the factory)
and thus no top gear slippage when locked.
M21, TH350, and Powerglide all fit the '68-'74 Nova without modifications, and I'd imagine the TH400 would, too, since they were available from the factory.
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Posted by Wayne Clayton
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