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how to figure out speedo gear in th350

2K views 7 replies 6 participants last post by  Bucknaked Racing 
#1 ·
so is it possible to figure out which gear set i need in the th350 by using the specs of the car? or do i need to pull it apart and go off of what is in the trans?
 
#7 ·
Back when the parts departments had actual catalogs, you could go by the gear ratio and tire size to determine which combo you needed. I was trying to find a set to work with 4.56's and 275/60/15's which made it kinda tough. I think at one time I owned most of the combos. Only some drive gears work with some driven gears--I found out the hard way after eating up several!
I found one combo that was just about perfect...for a few miles until it chewed up one of the gears. Luckily one is much softer than the other so there is a sacrificial piece.
 
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