3.55 to 4.10's?

[T.j.]

Hey guys, got some ?'s for yas.
Got the 3.55's in my 97 4x4 5.2 open diff
Im going to be putting on 32x11.5x15's and want to go to 4.10's
First off is this a smart move? i have on 31's now and its doggy, would 4.10's liven her up?
What kind of engine rpm's would i be at at 70mph,? right now im at right about 2k
Would gas milegae increase or decrease?
Whats your opinions on this in general?

Thanks guys

[T.j.]

Oh and almost forgot im going to be putting in an LSD unit. What should i go for? I hear Auburn is good. Any Suggestions on this?

[Lordofchaos]

ratio= (engine rpms x Pi x tire height in inches) / (tranny ratio x t-case ratio x speed x 1056)
this is a ratio I found on jeepforum when i had my jeep. You need to find out the ratio of the trany and Tcase though.

I also found this web site calculator, but I don't know what tranny gear ratio they are using.
http://www.differentials.com/calc.html

[T.j.]

said the rpm's with 32's and 4.10's would be a little above 2k. not bad. anyone else care to throw in on the 4.10's and the lsd unit, need a lil help here. Thanks

[razman131]

Oh and almost forgot im going to be putting in an LSD unit. What should i go for? I hear Auburn is good. Any Suggestions on this?

Get the Power Trax setup. also a good isea to run as close to the same ratio up front as well.