Seriously?

I can't get my Jeep over 90 lol

 

Haha just playing. That's what the calculator said

 

Haha. While I am not as fast as them, I do like to lay into snow/mud/hills. I just know that it always seems to be the guys with the deeper gear sets who break them. I have a budy with a Yota.. he used to run the 5.29s that are available for them and broke them quite frequently. Switched to a 4.56 and hasn't broken a set since as far as I know.

I haven't heard many stories of 4.88s snapping though Xjs though. I think our lighter weight probably helps a little bit. You should be fine!

I had an older XJ with 4.88s that I bought cheap because it was a POS. It had welded axles etc. It worked great playing in the mud in LA but man it was miserable on the highway (numerous reasons not just gearing) . In this XJ, I often drive 5-10 hours to go wheeling/backpacking (Montana is big and we go wheeling all over- Utah, going to do the Rubicon this summer etc.) And a top speed of 65 without cruising at 3500 rpm isn't going to cut it lol.

 

What do you mean by full case locker, the Detroit,arb....
and my axle has a aussie locker in it so it isn't completely open

 

doesn't high pinion front pull together while in motion? a HP axle in a front application will turn the drive side of the ring where a low pinion D30 would push away using the coast side. this is why a HP is instantly estimated 30% stronger than a LP in a front application. but it's flip flopped if you put it in the rear. a HP rear axle would go off the coast side but a LP would go off the drive side of the ring

this is why your front axle should always be HP and your rear axle should always be LP.



as for the 4.88's, I've only seen them break when people try to run 36's or bigger (dumb) ker-SNAP
you'll be fine as long as their installed half decent. run a good diff cover and call it a day

 

I believe you are correct sir. I completely overlooked that.

So reversing up a hill would be the best way to break the HP30 huh? Good to know... That or have a terrible install which didn't dial in your deflection very well.

See! Im not an expert on gears haha. None the less, it is still a smaller/weaker pinion gear and through personal experience, I am leery of running deeper gears on a small axle.

 

Sadly, a majority of folks have a LP D30 instead of a HP. That's what I was referencing to.

 

I mean the style of carrier isn't fully encased like say a Detroit or ARB is. If you look at the carrier case, its got those two big sections open for accessing spider gears. Now if you think about it, that only leaves 50% of the carrier to carry the stress of the ring gear while in motion. If you search for broken differential, you will see the cases busted in two. Sorry for the confusion.

 

and your rear axle at the same time! ha. leery is good but it's really not something that happens often on 35" tires (at least not documented). knowing that the 4.88 pinion is smaller is just something that's good to be aware of, but not something to fear

if you're breaking pinions, lay off the skinny pedal or build a bigger axle

 

That's what I thought you ment I just wanted to make sure. Thanks

 

No problem. My fault is I think too much like an engineer and mechanic and don't always explain it in layman's terms. Lol sorry.

 

Could also what I just did $140 for artec truss that ties the tubes into the pumpkin. And mini skids for the bottom had gift cards from Christmas at 4wheelparts. Also before this I put 10k hard miles on the hp & 8.8 combo with 4.88s.