JPXJMOAB

Alright looking to up the lift a bit to 6 or 6.5" and run 37s. I've got an 8.8 with the IRO swap kit and truss, and I'm looking into getting the IRO over axle Dana 30 truss as well as the IRO inner sleeves. Think it's possible or that's enough beef to support 37s? I do not want to swap 1 tons in this XJ, so that's out of the picture.

Big David

Plan to replace the stock shafts in the 30 with those tires. I know the 8.8 will stand abuse with 35s on stock shafts but not sure about 37s.

JPXJMOAB

You're right I forgot that part. I planned on chromoly front and rear!

bryweb

Its like running 33's on a Dana 35, you might keep it together, you might not, depends on the terrain and your right foot.

I think the majority will say the Dana 30 and the 8.8 are maxed out at 35" tires, I wanted 37's too and decided to just wait until I can upgrade axles first.... so I am at 35's

Also consider this, if you are on 37's you probably want 4.88's (the max a Dana 30 can go), and the Ring & Pinion start to get real weak with 4.88's. Which is why I decided to stick with 4.56 gears for my 35's

Save some money on getting Alloy Axles up front, just get the "Almost Alloy" kit from Iron Rock (or get full circle clips and modify to fit) and get some 5-760X Axle Joints, put the reset of the money in the bank for 1 ton upgrades later.

JPXJMOAB

4.88s are on the way now either way, that was decided a long time ago. And as stated one tons are not an option on this XJ. Thank you for the input

bryweb

What I have read, there is no need to sleeve and truss it, the truss is enough.

You plan on locking the front axle? if you are locking it are you going with a Full Case Locker?

Big David

They now make 5.13s for the Dana 30. Somehow, it uses a 4.88 pinion.

srb53150

you'll be fine, just dont drive it off road.

JPXJMOAB

Yes I will be locking it with a Detroit. And this is a trail only rig.

thebyus

I've everything I've read and everyone I've talked to has come back to Dana30 = 35" max, ESPECIALLY if you are locking it. And a Detroit is going to give you a MUCH higher chance of breakage than a selectable if you wheel it hard.

x2 on the truss with no sleeves. They essentially do the same thing, so really no point in duplicating the effort, it actually DOESN'T make it 2x as strong, just 2x as expensive!

Joshua White

I see what cha did there

andrewmp6

37s are about the limit for the 8.8 and the dana 30 35s are a thin line between breaking and making it.If you want a hardcore off roader you should think hard about 1 ton axles for it.

caged

i've ran 36 bias ply on a d30 for years. in the beginning i broke axle joints but upgraded to larger shafts with 760 joints. ran unlocked and worked fine on some of the tougher trails.
what caused most of my grief was running with 2psi and getting bound up in the rocks, then reversing out with wheels cranked full lock and giving it some juice. this is where i broke most.
i'm sure with the proper gearing, and maybe even a super 30 setup, you would be fine, but at the limits of your front end.

if you wheel with a heavy foot, you are sure to break almost any setup.

93_xjcherokee

I broke a locked Dana 30 on 31s once. Same way. Full lock, 4low, too much throttle trying to get out of a mud hole. Heard the loud pop and broke a shaft

Fred/N0AZZ

Both the 8.8 and the D30 really need to be replaced with 37's with at least D60's or better.