tr7triumph.com

Hi I recently requested info re raising diff ratio from 3.9 to3.45 to give my car longer legs on the highway and thanks to everyone I found the info very helpful.I left the diff ratio at 3.9. I am now considering changing the fifth gear ratio from 0.83 to 0.77 am wondering if anyone can tell me how many rpm I might reduce at 60mph (100kph). The wheels are standard 13 inch engine standard 2 litre.

Regards Lyle.

Hi,

Loads of RPM / Speed convertors out there like this

http://www.wallaceracing.com/gear-speed.php

Don't forget only a comparison don't mean you achieve these speeds !!

Cheers John


LIVE LIFE A QUARTER OF A MILE AT A TIME!

1976 Speke FHC Beauty Now with an overdrive conversion

1979 3.5 FHC(STATUS PENDING!!)

1982 2.0 DHC NOW A 4.6, BUILT NOT BROUGHT !!!!

Thanks John I did't realize there were so many ways to calculate speed/ratios/revs.
I must say this been very helpfull.

personally I still think changing rear diff ratios is easier and a much better bang for the buck than going inside the trans ......

Ron.

Thanks Ron at this stage I've decided to raise the diff ratio to 3.45. I presume you are either running a 3.45 or have changed one at some time.Anyway thank you for your advice.
Kind regards Lyle.