This topic contains 1 reply, has 2 voices, and was last updated by 
Richard Kirshy 2 years, 3 months ago.
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i replace my th 400 in my 1989 gmc r3500 with one i rebuilt and now my speedometer is off.should i take the speedometer gears off the old one and install them on the new one?
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You could count the teeth to see if they match or not.
If they do, it is possible the replacement transmission has different gearing than the original.
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