From 4 to 5 would give you 20%. but also 13-17 teeth on driven.

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Posted by Chris Case [172.68.47.75] on Sunday, May 06, 2018 at 08:53:33 :

In Reply to: Re: Speedometer question posted by Tim Holloway [162.158.62.18] on Saturday, May 05, 2018 at 13:16:41 :

And what if you already have a 5 in there?

200, 201, crash box,synchro all use the same gears.

What is your rear end ratio, still turning 7.50s?

11.00 and 5.83, I had to change from 4x14 to 5x16.

If you can pull the driven gear, and it is say a 17t, changing it to a 14t increase the reading by 18%, to 47mph. pretty close.

14 is the most common in FFPWs, I bet you already have one.


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