mfg Posted April 25, 2014 Report Posted April 25, 2014 I just went from a 3.07 to a 3.31 rear axle in my '63 Avanti. I've always been terrible at math. To get my speedometer back into sync, do I need to replace the speedometer drive pinion with one with MORE or LESS teeth? (The speedo was accurate with the 3.07 axle)
Gunslinger Posted April 25, 2014 Report Posted April 25, 2014 Which transmission do you have...automatic or 4-speed? I'm assuming you don't have the 3-speed. According to the parts manual: automatic - 20 teeth, part number 1544762 (3.31) 4-speed - 17 teeth, part number 1556036 (3.31) A 3.07 would have 18 or 16 teeth for the automatic or 4-speed respectively. So...to answer your question...you need a pinion with more teeth. Contacting Myer's Studebaker, Nostalgic Motors or Studebaker International should get you the right piece.
mfg Posted April 25, 2014 Author Report Posted April 25, 2014 Thank You very much.....I have a dozen or so new and used pinions, so hopefully I'll have the correct one here! (Automatic--20 teeth)
Gunslinger Posted April 25, 2014 Report Posted April 25, 2014 It doesn't appear from the parts manual that the different pinions are different colors like other manufacturers do...that makes identification simple.
mfg Posted April 25, 2014 Author Report Posted April 25, 2014 Why don't I have this luck when I buy scratch tickets?.....Out of the 15 pinions I rounded up TWO were # 1544762.....20 tooth! Thanks again!
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