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Transmission Gear Ratios

Transmission Ratios : 1




Transmission/Gear1st2nd3rd4th5th6thReverse
Powerglide1.761.00----1.76
Powerglide1.821.00----
TH200-4R2.741.571.000.67--2.07
TH3502.521.521.00---1.93
TH4002.481.481.00---2.00
TH700-R43.061.621.000.70--2.29
4L60 / 4L60-E3.061.621.000.70--
4L80E / 4L80-E2.481.481.000.75--
C4 & C62.461.461.00---
7272.451.451.00---
9042.701.541.00---
Borg-Warner T562.971.941.351.000.840.623.38

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 Gear2.412.562.733.083.233.313.423.553.703.733.914.104.56
PowerGlide4.244.514.805.425.685.836.026.256.516.566.887.228.03
TH200-4R6.607.017.488.448.859.079.379.7310.1410.2210.7111.2312.49
TH3506.076.456.887.768.148.348.628.959.329.409.8510.3311.49
TH4005.986.346.777.648.018.218.488.809.189.259.7010.1711.31
TH700-R47.377.838.359.429.8810.0310.4710.8611.3211.4111.9612.5513.95
4L80E5.986.356.777.648.018.218.488.809.189.259.7010.1711.31
Borg-Warner T567.167.608.119.159.599.8310.1610.5410.9911.0811.6112.1813.54

Overall Second Gear Ratio :
1 (Tranny Ratio x Rear Gear Ratio)






Tranny/Rear Gear2.412.562.733.083.233.313.423.553.703.733.914.104.56
PowerGlide2.412.562.733.083.233.313.423.553.703.733.914.104.56
TH200-4R3.784.024.294.845.075.205.375.575.815.866.146.447.16
TH3503.663.894.154.684.915.035.205.405.625.675.946.236.93
TH4003.573.794.044.564.784.905.065.255.485.525.796.076.75
TH700-R43.904.154.424.995.235.365.545.755.996.046.336.647.39
4L80E3.573.794.044.564.784.905.065.255.485.525.796.076.75
Borg-Warner T564.684.975.305.986.276.426.636.897.187.247.597.958.85


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.
Posted by Wayne Clayton

 

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2002

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