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GM Powerglide Automatic Transmission Ratios

The length of the input shaft can be measured to determine the ratio. The input shaft must be pulled out to measure.
It is best to stand transmission up on its tail to remove and replace the input shaft.
TIP: The input shaft inserts into a bronze thrust washer inside the transmission.
Make sure this washer is centered and not slid off to one side before replacing input shaft..
Input Shaft Length 1ST 2ND
12 7/8 Inches 1:76 1:00
12 5/8 Inches 1:82 1:00

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