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Old 02-02-2013, 06:08 PM   #1
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Lift needed for 33" BFG A/T's

Just purchased my first jeep stock, '04 Unlimited LJ w/31x10.5x15's. Wanting to put 33's on stock 15x8 rims, if possible. How much lift is needed?

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Old 02-02-2013, 06:11 PM   #2
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2.5" and 1.25"BL

You'll probably need spacers(I'd go spidertrax) if you want to keep the stock wheels

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Old 02-02-2013, 06:15 PM   #3
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how big of spacers?
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Old 02-02-2013, 06:19 PM   #4
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Quote:
Originally Posted by zapper71 View Post
how big of spacers?
Take your pick


1.25"
Jeep 1.25" Thick Wheel Spacers



1.5"
Jeep 1.5" Thick Wheel Spacers
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Old 02-06-2013, 06:39 PM   #5
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I'm sure raider would love to have his pick...
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Old 02-06-2013, 07:01 PM   #6
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Quote:
Originally Posted by zapper71 View Post
Just purchased my first jeep stock, '04 Unlimited LJ w/31x10.5x15's. Wanting to put 33's on stock 15x8 rims, if possible. How much lift is needed?
33's are fit in two common ways on TJ's:

1. 4" suspension lift, with ~2" bumpstop extensions in front and ~2.5" in the rear. Requires a SYE/CV shaft.
2. 2.5" suspension lift, with a 1.25" body lift, with ~1-1.25" bumpstop extensions in front and ~1.25-1.5" in the rear. The 1.25" BL usually accompanies a 1" Motor Mount Lift to offset some of the driveline angles.

Either way you go, figure on some or many of the following components: longer front brake lines, extended sway bar links front and rear, gears, brake and steering upgrades to accommodate larger tires, SYE, CV shaft, bumpstop extensions, new shocks, adjustable track bars, and a rear track bar bracket.
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Old 02-06-2013, 07:55 PM   #7
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Quote:
Originally Posted by UnlimitedLJ04 View Post
33's are fit in two common ways on TJ's:

1. 4" suspension lift, with ~2" bumpstop extensions in front and ~2.5" in the rear. Requires a SYE/CV shaft.
2. 2.5" suspension lift, with a 1.25" body lift, with ~1-1.25" bumpstop extensions in front and ~1.25-1.5" in the rear. The 1.25" BL usually accompanies a 1" Motor Mount Lift to offset some of the driveline angles.

Either way you go, figure on some or many of the following components: longer front brake lines, extended sway bar links front and rear, gears, brake and steering upgrades to accommodate larger tires, SYE, CV shaft, bumpstop extensions, new shocks, adjustable track bars, and a rear track bar bracket.
Does an LJ require an SYE for 4" suspension lift? I'm asking, because I don't know. I'd guess it's a good idea, but required?
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Old 02-06-2013, 08:45 PM   #8
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I just did a 4" lift from Rough Country, the N2.0 lift. It came with the proper t-case drop, bump stops, and track bar bracket. I was rubbing BAD with the 33x12.5s and 2" budget boost. Glad i made the switch
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Old 02-06-2013, 08:51 PM   #9
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Does an LJ require an SYE for 4" suspension lift? I'm asking, because I don't know. I'd guess it's a good idea, but required?
with the LJ, you will likely not have vibes on the highway with 4" of lift.

however, the u-joints won't be very happy at full droop, and you may stress the output shaft on the t-case...which can causing damage.

vibes on the road aren't the only reason to install a double cardan driveshaft.
more info here: What is a CV shaft and why do I want one? - JeepForum.com
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Old 02-06-2013, 08:56 PM   #10
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Quote:
Originally Posted by UnlimitedLJ04 View Post
with the LJ, you will likely not have vibes on the highway with 4" of lift.

however, the u-joints won't be very happy at full droop, and you may stress the output shaft on the t-case...which can causing damage.

vibes on the road aren't the only reason to install a double cardan driveshaft.
more info here: What is a CV shaft and why do I want one? - JeepForum.com
I understand all of that. I just wasn't sure if the wheelbase might be long enough to mostly negate the need for SYE. The stock 231 output shaft configuration can't be very strong, by design, so a fixed yoke is just a better design, no matter the lift height or drive shaft length.
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Old 02-06-2013, 08:58 PM   #11
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And it always bugs me when a double cardan joint is referred to as a CV, or constant velocity joint, because it isn't.
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Old 02-07-2013, 06:48 AM   #12
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Patrick, on my LJ I'm running a 3" suspension lift, no BL and 33x10.50s on 15x7 wheels w/3.75 bs.
No vibes, still running stock driveline.
Works well as a DD and on the moderate trails I run.
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Old 02-07-2013, 07:05 AM   #13
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I have a 06 with the NP231 t case and i can tell you from personal experience that having a 4 inch lift without a SYE kit and CV shaft is riding on borrowed time. the vibes got to where it actually ate the rubber on the t case balancer off threw the ring around my drive shaft. after which i removed and was lead to false information saying you dont need it. few months later i ended up blowing a rear end out. after several busted knuckles and a few choice words i have a new rear end with posi locker a AA sye kit and a tom woods custom CV shaft
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Old 02-07-2013, 07:55 AM   #14
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Originally Posted by mossyoakwrangler View Post
I have a 06 with the NP231 t case and i can tell you from personal experience that having a 4 inch lift without a SYE kit and CV shaft is riding on borrowed time. the vibes got to where it actually ate the rubber on the t case balancer off threw the ring around my drive shaft. after which i removed and was lead to false information saying you dont need it. few months later i ended up blowing a rear end out. after several busted knuckles and a few choice words i have a new rear end with posi locker a AA sye kit and a tom woods custom CV shaft

Is your Jeep an LJ? That's what we're talking about here.
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Old 02-07-2013, 07:56 AM   #15
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Quote:
Originally Posted by lynn View Post
Patrick, on my LJ I'm running a 3" suspension lift, no BL and 33x10.50s on 15x7 wheels w/3.75 bs.
No vibes, still running stock driveline.
Works well as a DD and on the moderate trails I run.
That's what I was thinking. In fact, your Jeep was my point of reference..
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Old 02-08-2013, 05:26 PM   #16
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2in budget boost and trim your fender flares or not but 2in is the minimum thats what mine sat at after my 2.5 coils settled and never had a problem rubbing.

BTW i didnt trim the flares still stock

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