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Discussion Starter · #1 ·
I've had my 8" lift for about 7 years I've only run 35's but Now I feel the need to go BiG . Should I just go with 38's ?
 

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I was under the impression that size doesn't matter? Lol j/k it's you jeep! Just hope it's not a DD. kind of wonder were u plan on using 40's to off road? Or is it just for looks?
 

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On Stock axles and stock wheel base? I wouldn't. My Chevy has 39.5's and one tons and it works great but no wayI would run that big of a tire on my jeep without spending a couple of grand and a new dd.
 

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I have an 8 inch lift on mine run 37's all the time and it is my dd. I also have a dana 44. Front and rear. Never had a problem. And I use it off road as much as I can
 

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I ran 38s for quite a while on my 01. Beat it to hell n back in the mud pits. Of course you are more prone to breakage, but hell if you dont break something, would be a pretty boring hobby. Some folks are out to build the "best" rig humanly possible, and never break nothing... personally i prefer just upgrading as i blow stuff up. If you want to run 40s, knock yourself out. If its too big or too loud...your too dam old.
 

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The front Dana 30 is not up to anything larger than 35" tires, it will start wearing out things like ball joints with even 37" tires. And if your rear axle Boobicon is a Dana 35, even a 35" tire is too big for it. For a Dana 44 with aftermarket alloy shafts, a 37" is pushing it.
 

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Discussion Starter · #9 ·
I have a rubi so 44's front and rear w/ lockers it's already been re-geared , tuned, banks power pack. I live in fl so I don't really have to many fun trails so I'm mainly in mud/sand. This is my dd I have over 120k lifted miles on it and it's definitely not for show.
 

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Your front D44 is more Dana 30 than Dana 44. The only thing in a Rubicon's front Dana 44 that is truly Dana 44 is its center pumpkin, ring & pinion gears, and inner axle shaft. EVERYTHING else is pure Dana 30... knuckles, axle tubes, inner/outer C's, outer stub shaft, ball joints, brakes, u-joints, steering, etc. And what is it about the Rubicon's front Dana 44 that doesn't hold up to 37" and bigger tires? All its Dana 30 components.... especially its ball joints.

I'm running a Rubicon with a beefed up front D44 including Superior Axle hardened alloy axle shafts, Warn "big" hubs, and CTM u-joints. And I'm still limiting its tire size to 35".
 

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Discussion Starter · #11 ·
Your front D44 is more Dana 30 than Dana 44. The only thing in a Rubicon's front Dana 44 that is truly Dana 44 is its center pumpkin, ring & pinion gears, and inner axle shaft. EVERYTHING else is pure Dana 30... knuckles, axle tubes, inner/outer C's, outer stub shaft, ball joints, brakes, u-joints, steering, etc. And what is it about the Rubicon's front Dana 44 that doesn't hold up to 37" and bigger tires? All its Dana 30 components.... especially its ball joints.

I'm running a Rubicon with a beefed up front D44 including Superior Axle hardened alloy axle shafts, Warn "big" hubs, and CTM u-joints. And I'm still limiting its tire size to 35".
Oooo did not know that .. Limited in the fact that it'll shatter everything under there or just not a fun ride ?
 

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Limited to 35" tires so I won't have to waste my time replacing prematurely worn components like ball joints. Not to mention your steering and brakes are nowhere (!!!) close to be able to handle tires larger than 35". The TJ's brakes are barely adequate for 35" tires, let alone anything bigger. Heck the steering (drag link and tie rod) should be replaced (Currie makes a good kit) for even for 35" tires.
 

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Discussion Starter · #13 ·
Already replace all of my steering , got hit by a drunk driver.
I already have to replace bushing quite frequently. So the only thing I need is big breaks, spare bushing, and chromoly axels
 

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Bushing? What bushing? I'm talking ball joints. Chromolly axles, as I am running, won't prevent accelerated wear to the D30 components as mentioned above. Steering? What did you install?

Edit: I hate to sound like a spoil-sport on this but many new Jeepers see big 40" tires on Jeeps and want the same for theirs... but they have no idea what went into getting those Jeeps built up sufficiently with new stronger axles, etc. so they could successfully run big tires like those. A Rubicon with its OE f/r Dana 44 axles is really only good up to 35" tires. Bigger than that and you have to swap in stronger axles if you want to keep them reliable so they can hold together on the level of trails that require that big of a tire. Really.
 

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Discussion Starter · #15 ·
Sorry ment the joints I have curries Currectlync Heavy-Duty Tie Rod System. It's plenty beefy weighs almost as much as my bumper. Everything has eccelerated wear I can't get away from that but I don't want to break everything just driving down the road.
 

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I run Currie's steering too but I wouldn't for 40" tires. Heck I have bent my Currie tie rod several times just with my 35" tires... though it was designed to bend just before something more critical broke first.
 

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Discussion Starter · #18 ·
I'm sure your right about the 40's you obviously know what your talking about. How about 37"s ? It looks like you like to play in the rocks I don't need anything that strong no rocks around here just mud and a few flat trails
 

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The only size I can in good conscience recommend is 35" though I know some who take it real easy don't have major problems with 37". You will really need to regear your axles though. I dunno what transmission you have but if you have a stick shift, I'd go with the lowest ratio available for the Rubicon axles which is 5.13.
 

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Discussion Starter · #20 ·
Running 4.88 with an automatic i can still do 80 in overdrive Thanks for the advice, I think you have successfully scared me out of running anything over 35
 
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