D521XJ

sup guys,, goin to spending some $ here soon for a re-gear and lockers..... i have a HP d30 and Chrysler 8.25, what do you guys think the largest tire size i can run on these axels is? thinking 4:88s with super30 kit for the front and im not sure what my options are for the rear..
TIA
D.

unidentifiedbomb

Stock shafts should be fine up to 35s on both axles depending on how hard you are on the throttle. You can probably run 37s safely on built D30/8.25 axles.

Rockhead

I've read a lot on this subject lately not only on here but in off roading magazines (four wheeler, jp) because I'm moving up to 35s from 33s. On a built dana 30 and chrysler 8.25 setup I've read consistently not to go bigger than 35s for serious off roading.

andrewmp6

Off road 35s if your easy on the skinny pedal.

XJmember

This ^^, I personally wouldnt do 35's. The rear is fine, but I've broken 3 axle shafts in the D30 last year already and Im on 33x10.5's. Maybe time for cromo's?

docmedpros

35s are fine, just make sure to get upgraded shafts.

Fred/N0AZZ

I run 33x12:50's on a 15x8 wheel and a set of 35's on beadlocks so far no breakage but I go easy on the skinny peddle.

emptypockets

I run 35x12.5x15 LTB's with beadlocks (so heavy tire/wheel combo) and so far, so good. My D30 is trussed and I'm running stock inners with chromo outers, c-gussets, 4.56 gears, and a locker. The rear is a 29-spline 8.25 that's locked, stock shafts, and I'm getting ready to truss it since I won an IRO truss at Winterfest. I'm more technical than woo-pow when it comes to driving style. I run out in the Midwest, so rocks and mud for terrain.

unidentifiedbomb

Is that like stock shafts from the u joint to the carrier and chromo from the u joint to the hub?

wasilla xj

d30/8.25 welded i run 35x16 boggers on stock 3.55s, yes things break but i always care a spare shaft or two with me... occasionally I am light on the throttle but not often,

emptypockets

Yes, I'm running a Warn manual hub conversion kit and it upgrades the outers to chromo. Inners are still stock for now and I've tack welded the caps on the u-joints on the stock side. Works for my junk currently.

RoyalXJ

lol

Tonis506

I got locked d30 and 8.25 on 35s with bead locks stock shafts in back and grand cherokee cv shafts in front. I am not easy on it . I have been fine. Carry spare shafts with you, you'll be fine in sure . Just put 4.88s in it so I don't know about those yet. I am going 37s when these wear out too.

RoyalXJ

Gears = more torque
More torque = broken parts
4:88 + 37s = KABOOM

unidentifiedbomb

LOL