gears

Hello , I just signed up and will be swapping a AW4 into my 97 TJ. I'm running 37 mtr w Kevlar with 4.88 @ the time with a 3 speed auto. Rpms are crazy high @65 around 3100. What I would like to know if anyone is running 5.13 or 5.29 wit 37 inch tires and what they think about it with the 4 speed auto. Looking to bring my rpms down @ this point. Thanks

Use the gear calculator at www.grimmjeeper.com to do a side x side comparison of the various ratios your considering.

welcome to an XJ forum.

with the same tranny, deeper gears (lower numerically) will make you run higher RPMs at the same speed.

adding to serious... i use this calculator because you can manually input your transmission gear ratios:
http://www.csgnetwork.com/multirpmcalc.html

you can find info on the transmissions in question at novak, including the drive ratios:
http://www.novak-adapt.com/

i cannot comment on the quality of any auto tranny. i have an AX15. manual.

I run 5.13's with 37's on the highway. RPMs are somewhere around 2500 at 75. With a stroker I get 16-17 mpg on the highway.


Doing an AW4 swap into a TJ is not all that difficult.

Thanks guys for the input, just ordered up a set of 5.29's. Cal do you have a thread on the stroker you have? Is it a a crate stroker of did you put it together your self?

cal said:

I run 5.13's with 37's on the highway. RPMs are somewhere around 2500 at 75. With a stroker I get 16-17 mpg on the highway.


Doing an AW4 swap into a TJ is not all that difficult.

Click to expand...

No thread on it, this stroker was in the jeep when I bought it.

Its a budget stroker (4.2 crank/rods, stock pistons) with a cam similar to the comp 235-1 and a mild port/polish job on a renix jeep.