700r4 Transmission speedometer gear ratio on 1964SS Impala ?

Asked by Richard Feb 13, 2025 at 06:28 PM about the 1964 Chevrolet Impala SS Hardtop Sport Coupe RWD

Question type: Car Customization

I have a 64 Impala SS OEM rear axle with a 700R4. with 215/70R14 tires.  My
question is using a stock mechanical speedometer cable what tooth spline gear
will I use for transmission?.  

1 Answer

312,495

Very hard to say the 700R4 transmissions went from 34 to 39 teeth, all depending on the speedo drive gear, the differential ratio and tire/rim size. Your most likely going to have to experiment to find the correct driven gear. Plus you may need to find a speedometer shop that can build you and adapter to get it just right.

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