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Transmission Ratio Drop From Gear to Gear

Sometimes selecting a transmission comes down to the drop between gears. This chart will show the percentage drop for 8 of GM's popular transmissions. The first column of each transmission shows the ratio for that particular gear while the second column of each transmission shows the percentage of drop for that gear from the previous.

Manual Transmissions - 4-speed
M20 (64-65)Percentage DropM20 66>Percentage DropM21/M22
2.56  2.52  2.20 
1.9125.39% 1.8825.40% 1.6425.45%
1.4822.51% 1.4622.64% 1.2821.95%
1.0032.43% 1.0031.51% 1.0021.88%
        
Automatic Transmission - 2-speed, 3-speed
PowerglidePercentage Drop TH350Percentage Drop TH400Percentage Drop
1.76  2.52  2.48 
1.0043.18% 1.5239.68% 1.4840.32%
   1.0034.21% 1.0032.43%
        
Automatic Transmission - 3-speed with overdrive
200-R4Percentage Drop 700R4Percentage Drop 4L80E 
2.74  3.06  2.48 
1.5742.70% 1.6346.73% 1.4840.32%
1.0036.31% 1.0038.63% 1.0032.43%
0.6733.00% 0.7030.00% 0.7525.00%
        

Ground Up Chevelle Parts    Chevelle Transmission | El Camino Transmission