Rear axle Ratios.

[asorensen]

I have new 31" tires and am trying figure out the difference in speed.
Does anyone know the rear differential ratios so that I can make the calculations? Or has anyone already done this?

[Mystery Machine]

Hi there,

Assuming you have a P35W or P25W then you will probably have a final drive (reduction ratio) of 4.875

If you let me know the year and transmission type (Man/Auto) I can also find the gear ratios for you if that is any help??

If you look at the VIN plate hidden in the carpet flap just below the drivers seat (just between/below your knees when sat in the seat) then I can identify things a little more accurately.....

What would help:

Model: P??W (Probably P35W or P25W)
Transaxle: R5M21 or V5M21 or KM147 or KM135

Basically the more info you can give me, the more I can find out!! (Heck - give me your chassis number and I can even work out the exact model year and which factory it came from!! :lol: )

Regards,

Bruce.

[BCDelica]

Howdy,

If you PM me your email I'll send you a great tire calculator for MS Excel that does all the speed/diff ratios/tire sizes calculations.

Pretty sure in some way it was a Bruce post somewhere that led me to it. 8)

[asorensen]

Hey thanks for the help.
Bruce I have a 1991 manual transmission Q-P35W HSNXT,
trans axle V5M21 4875 Chasis # P35w-0109922
I did work on a spread sheet myself but i made some assumptions! Any help you provide would be greatly apprieciated.

Andy

[BCDelica]

Forgot to mention the gear ratio page North Shore Offroad has - http://www.nsor.com/FAQs/gear-ratios.htm