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-   -   Are 40's to big (http://www.wranglerforum.com/f282/are-40s-to-big-193916.html)

Boobicon 10-18-2012 03:06 AM

Are 40's to big
 
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 ?

lapis_blue 10-18-2012 03:28 AM

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?

thewampus97tj 10-18-2012 05:50 AM

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.

ggross 10-18-2012 07:33 AM

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

Irongrave 10-18-2012 08:12 AM

with stock axles anything over a 35 is running a risk of breaking parts.

Imped 10-18-2012 08:18 AM

Must see pics of this silliness.

Mudweiser 10-18-2012 09:30 AM

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.

Jerry Bransford 10-18-2012 10:19 AM

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.

Boobicon 10-18-2012 02:09 PM

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.

Jerry Bransford 10-18-2012 02:16 PM

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".

Boobicon 10-18-2012 02:26 PM

Quote:

Originally Posted by Jerry Bransford (Post 2903114)
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 ?

Jerry Bransford 10-18-2012 02:30 PM

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.

Boobicon 10-18-2012 02:41 PM

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

Jerry Bransford 10-18-2012 02:44 PM

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.

Boobicon 10-18-2012 02:53 PM

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.

Boobicon 10-18-2012 02:57 PM

Only thing I'm missing is the steering stabilizer

Jerry Bransford 10-18-2012 02:58 PM

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.

Boobicon 10-18-2012 03:01 PM

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

Jerry Bransford 10-18-2012 03:07 PM

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.

Boobicon 10-18-2012 03:12 PM

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

Dextreme 10-18-2012 03:43 PM

You might contact this rdelling guy about his TJ w/40's to see what problems he has had or get his considerations.

DD LJ's and TJ's on 40's! Pics and Specs...Please!!! - JeepsUnlimited.com Forums

Boobicon 10-19-2012 02:45 AM

Just checked out the forum those things are crazy. Hydraulics steering, Dana 60's, high lined fenders or none at all, stretched, atlas transfer, 3spd trans... Looks like this wont be happening anytime soon. Guess I should start looking for a totaled dodge to steel parts from
Thanks for the link dextreme

Imped 10-19-2012 08:31 AM

Quote:

Originally Posted by Boobicon (Post 2905198)
Just checked out the forum those things are crazy. Hydraulics steering, Dana 60's, high lined fenders or none at all, stretched, atlas transfer, 3spd trans... Looks like this wont be happening anytime soon. Guess I should start looking for a totaled dodge to steel parts from
Thanks for the link dextreme

Yeah.....

That's what it takes to run tires that big.

offroad cowboy 10-19-2012 09:00 AM

I run 38.5's on my jeep. I have 7 inches of lift. one thing you also have to remember is when you flex your jeep out, will the tires rub on the fenders? mine do sometimes so going with high clearance fenders, dont want to lift any higher. Also like everyone said you will have to upgrade. I run a Waggy 44 with chromo axles and yukon super joints, also a high steer set up with homemade hydo-assit. Rear is rockjock 60. i have also changed my T-case to a Dana 300. Never broke nothing major other than a hub. I have a bubby that runs 43's on his 08 jeep, but same all upgraded. also niether are DD's

Boobicon 10-19-2012 10:15 AM

Quote:

Originally Posted by offroad cowboy (Post 2905500)
I run 38.5's on my jeep. I have 7 inches of lift. one thing you also have to remember is when you flex your jeep out, will the tires rub on the fenders? mine do sometimes so going with high clearance fenders, dont want to lift any higher. Also like everyone said you will have to upgrade. I run a Waggy 44 with chromo axles and yukon super joints, also a high steer set up with homemade hydo-assit. Rear is rockjock 60. i have also changed my T-case to a Dana 300. Never broke nothing major other than a hub. I have a bubby that runs 43's on his 08 jeep, but same all upgraded. also niether are DD's

Where's the fun if you can't drive it daily !! I didn't spend 30k on it so I.could only take it 3 miles up the road/trail seems pointless.. so I guess its safe to say I won't be running 40s

Imped 10-19-2012 11:42 AM

Quote:

Originally Posted by offroad cowboy (Post 2905500)
I run 38.5's on my jeep. I have 7 inches of lift. one thing you also have to remember is when you flex your jeep out, will the tires rub on the fenders? mine do sometimes so going with high clearance fenders, dont want to lift any higher.

Bump stops.

1jeeplvr 10-19-2012 03:54 PM

Quote:

Originally Posted by Jerry Bransford (Post 2902418)
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.

Boobicon :rofl::rofl:

UnlimitedLJ04 10-19-2012 04:46 PM

Quote:

Originally Posted by Imped (Post 2905900)
Bump stops.

huh? what? :rofl:

offroad cowboy 10-19-2012 05:44 PM

Quote:

Originally Posted by Imped (Post 2905900)
Bump stops.

Still rub alittle with them, might go to hydro ones. want more flex. supension will just need more room and upgrade my crappy shocks.
I can drive mine on the road but dont like to much. I dint build it for the road, thats what my CJ is for. :cool:

offroad cowboy 10-19-2012 06:11 PM

Quote:

Originally Posted by Boobicon (Post 2905645)
Where's the fun if you can't drive it daily !! I didn't spend 30k on it so I.could only take it 3 miles up the road/trail seems pointless.. so I guess its safe to say I won't be running 40s

I am not saying you cant run big tires on the road, you can, just make sure you abide with the laws where your at, mudflaps,etc. I just built mine for more offroad use. have friends that run 37's and 38's on the road.


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