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TH400 speedo gear

14494 Views 8 Replies 4 Participants Last post by  hpsherlin
I have the wrong speedo gears in my trans. My rear gears are 3.73, Do i need to change the metal gear on the input shaft or just the plastic one on the cable???
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I went to a local tranny shop.
The speedo was 20 mph fast after changing from a 2.73 to a 3.42 gear set in the rear.
The owner of the tranny shop put a driven gear like you are showing with more teeth in the tranny and said "try it out". I had a hand held GPS to show MPH.
Still fast. Drove back and he put another in with more teeth..another drive...still a little fast...another more teeth gear and another drive.
More time to let headers cool off than to change that sucker.
4 mph fast now and the speedo works well. He didn't have any with more teeth and I said the 4 mph fast was just fine.
$20 total cost.
Try out a local long time tranny shop that is private owned and you might get the same service, hopefully.
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