FreddyD'Apice

Ok so I have an xj on 35s long armed and blah blah with 3.55s and it sucks but I wouldn't drive anything else. So I ended up buying a d60 and sterling 10.5 and plan to them in with 40s. So my jeep may be my dd. so am I crazy to dd a full width xj on 40s or is it somewhat justifiable. I see trucks and jks on 37 and 40s all the time. So basically want opinion if I'm crazy or not. Also I have 5.13s for the new axles.

andrewmp6

I wouldn't run bigger then a 35 on a daily driver,40s or bigger will get real floaty and sometimes bouncy at highway speeds.The other thing big tires ain't cheap and daily driving them they wear out faster then you would think.The other thing is tread pattern a wrangler mtr would be ok but a super swamper bogger would be hell on a wet road.

MoparNJeep

As long as you know your gas mileage will suffer more then I'd say run em. 40s gonna wear fast on the street and are not cheap though so be prepared for that.

I'd get you another 4.0 engine and build a stroker though. You'll love the added torque, with the 35s and 3:55s or 40s and 5.13.

PUNISHER

I agree with andrew and Mopar, tires are not cheap. Tires period are not cheap anymore.

I don't know the NC laws but, the troopers in Va. would love to give tickets for the tires sticking out to far. I know from experience when I had my 99 Tacoma on 40's. I got pulled over every time I drove it and it was either throw on some ugly marker lights or build/buy some monster fender flares.

I know you said that you wouldn't drive anything else but, if it was me. I would buy a beater ride, gather up all the pieces and parts that's needed for the swap. Take my time and put the axles in, drive it for awhile and see how you like it. If it's not what you expected, drive the beater around and cruise the XJ on or offroad as you want. That's just my opinion!

srb53150

the big axles are way too heavy for the uniframe/ body to support w/o massive plating & reinforcement.

Atmos

I run 1 tons and 37's on my Cherokee. it's totally fine on the street and it wouldn't be much different on 40's. it does 80mph on the freeway and I actually get decent mileage if I drive it nicely

you will NEED hydro assist and some really good front uniframe bracing (and probably a cage). the only other thing I can recommend is go with the 5.38's if they're available. they're the only way to go with 1 tons

daily driving it gets old pretty quickly though. I got tired of it and now I drive a Honda to work but it's still fun to whip the jeep around town some times

andrewmp6

Atoms what size rims do you run tho?A 37 on a 17 inch rim is a smaller tire then a 37 on a 15.

93_xjcherokee

80mph on full widths? I can't even do 70 on 32s

andrewmp6

80 with full widths can happen depending gears and how balanced the wheels are.

Atmos

37x12.5x17. that's splitting hairs as far as I'm concerned. You're still running 500lb axles front and rear with a ton of other heavy add-ons. you can't run 15" wheels on 1 tons anyway they won't clear the brakes

5.38's man. they work. my last trip to reno was 117 miles. I used about half a tank to get there which is almost 12mpg. not bad for a 200,000 mile motor and camping gear

I don't even balance my tires

xjmarc

I run beadlocks so there really isn't a good way to balance but I've ran 60 and didn't have any issues, just have to air up a little since I normally run 3psi.

bryweb

Bummer, My old 2000 TJ 6cyl, 5spd on 35's with 4.56 gears would do 80mph (via GPS) all day long , and I had it up to 100mph once just for grins (wouldn't suggest it), and my 2000 XJ 6cyl, auto, with 3.55 gears on 33's has been on many 300-500 mile trips at 80mph with the cruise most of the trip, couple of times pulling a small u-haul trailer, both were one finger drivers at those speeds too.

Both on Goodyear MTR's (one old style, one kevelars)

Only jeep I had that could not do 80mph was my 88 YJ 4cyl, i was lucky to keep it at 70mph downhill, drafting a semi on street tires.

Rogue4x4

3 PSI? On the road?

Best way to balance big tires? Balance beads or airsoft BB's. Running about 9 oz of airsofts on my 35's on beadlocks, and it works fantastic...

93_xjcherokee

I run 32s on 3:55 gears and at 65 my Rpms are about 2500. At 70, I'm at 3k and I Dont like to push my jeep further than 3k rpm ever.

andrewmp6

You can run 15 inch rims on a dana 60 just takes a lot of grinding on the calipers,Or swap to 3/4 ton brakes with caliper adapter brackets a few make.