going to build up the zuk with full size axls .was wondering what r&p should i use with my 6.4 tcase gears and 5 speed.i rarely use 1st and 2nd mostly 3rd .when my rear stock axl came unglued.i want to go 37" and larger would this be to much of a strain on my motor and clutch?

Well Stan was running 39.5 Pit Bulls
and Jake Palmberg was running 44" boggers,
(Sammy) what did you have in mind for tire size?

i felt so little at mudstock i needed more clearence bad ,so figure bigger tires need more gear,and i think my tcase is low enuff .will i need more motor?

Need is such a poor choice here,
You Can Always Use More Motor 

I,m running 39.5 pit bulls with 6.50  gears &  a 4 to 1 t-case works great . but the quest for a few more ponies is always there.    stan

oh yea the rock star has 39.5 pit bulls with 5.12 gears 4  2  1 t-case  works great also.

a buddy of mine has a sami witha  4cyl wrangler motor on propane with 37's. he has a local reduction box in it. think it is about 150:1. just ordered new diff gears and lockers. it is on d44's that have been narowed.