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4.10 diff

fillerup

Freshman Member
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I just bought a 4.10 diff for my TR6. The car now has an od tranny and I am wondering about the difference in rpm between the 3.7 diff and the 4.10 at highway speeds.
Thanks
Ed
 
if you go to the Buckeye Triumph site they have a speed calculator there. Just change the 3.7 rear to 4.10

You will need Excel to use the program.

Calculator
 
Hi,

The calculator Tom mentioned is pretty cool. You'll need to know the reduction provided by your OD, to figure out "5th gear", though. A-type ODs mostly provided 22% reduction. J-type ODs, 25% reduction. Some were as much as 28%. Most were labelled on top, the first two digits of the model number indicated amount of reduction, i.e.: 22xxxxx or 25xxxxx. Of course, there is a possibility that any given OD could have been changed to a different reduction ratio at some point during it's life. But, if you know its history, maybe that's not a concern.

Cheers!

Alan
 
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