Hello Again -
I have a problem and would like to pick your collective knowledge - I have a
'70 SS 396 which has I'm told a posi rear with a 3.49 gears - The problem is
when I'm driving my speedometer indicates a high speed than I'm actual doing by
10mph - When my mechanic pulled out the speedometer gear he found that it had
39 teeth - So I ordered a few different gear with more teeth - The problem I
have now is the diameter of the existing 39 tooth gear is 1 7/16" and the
replacement gears are 1 3/4" - In addition, they will not fix inside of the
existing housing - The housing is stamped 36-37-38-39 which I assume is the
different gears it will accept - An suggestions on how I can get my speedometer
to give me a more accurate speed reading would be appreciated - Rich
PS I've read that the only gears offered for my year were 3.31 so my mechanic
could be off in his
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