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Old 01-04-2023, 07:40 PM   #3
72SB
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Join Date: Apr 2022
Location: Moorpark, CA
Posts: 775
Re: 72 Saginaw 3 speed Speedo Drive gear?

I have a 21 tooth now, driven gear. 20 (blue) would be better as speedo is off about 4mph at 55 mph as I now have 235/75 x 15 tires (28.9" tall)

It had a 22 tooth with the smaller tires I did have which I believe to be original size

I am doing a rear gear swap so will have to get another driven gear but was asking what the likely drive gear is in the Saginaw. I suspect 8 teeth but when I tried a 20 tooth it was too small or some reason it would not engage the 8-tooth drive gear so had to use the 21 which does work but is still off a few mph with the larger 75 series tires

My PG and a TH350 trans both have 8 tooth drive gears and I have several size driven gears for the various gear ratios I have had on those other 2 cars
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