replaced th400 know speedometer is off

[wesley]

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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[Richard Kirshy]

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.

[Author]

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