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Old 01-12-2012, 08:03 AM   #1
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life with a 2012 JKUR

I have a touch over 5k on it now, driven it across country, lifted it, run 35 inch tires since new. Currently have aftermarket front and rear bumpers, narrow fender flares, and wheel the crap out of it. Driveshafts (both) need to be replaced, exhaust relocation for the crossover pipe is mandatory! IT really seems to be holding up well for what I do to it. still has great road manners.

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Old 01-12-2012, 12:25 PM   #2
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Man, that is a cool picture.

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Old 01-12-2012, 01:09 PM   #3
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Jealous.
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Old 01-12-2012, 01:14 PM   #4
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Why do both driveshafts need to be replaced? Are they that junky on the new jeeps?
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Old 01-12-2012, 01:23 PM   #5
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Originally Posted by jeepjones View Post
Why do both driveshafts need to be replaced? Are they that junky on the new jeeps?
The pinion angle that's created with that much lift. Your boots seals start to fail. I suppose you could drop the t-case, but that's not really done on JKs. Read this: http://www.jpmagazine.com/techarticl...fts/index.html

The axles also become a little short eventually relative to the height. And I think it's worse in the 2012s because of exhaust piping or something that interferes with the wide factory shafts.

Some good pics from a pre-2012: http://www.jkowners.com/forum/showpo...1&postcount=10

How much lift do TJs require to clear 35s with room to flex like as pictured? Would they not not need new driveshafts by that point? (Serious question - not being snarky.)
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Old 01-12-2012, 06:44 PM   #6
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my jeep is set up as a LCG style. actual lift is just under 3 inches with the added weight of armor, bumpers, and winch. But the actual travel of my suspension is equal to 6 plus inches of lift. my wheelbase is stretched almost 2 inches. The stock driveshaft design can not handle that range of motion with out all the rubber tearing apart.. The front exhaust pipe crossover is a problem over anything more than a BB. If I didnt run my suspension thru its full range of motion I could of left everything alone, driveshafts and crossover pipe. Anything more than mallcrawling would be off limits.
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Old 01-12-2012, 06:48 PM   #7
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ram video.m4v - YouTube a short little easy offroading in my jeep
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Old 01-12-2012, 08:03 PM   #8
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Quote:
Originally Posted by MTH

The pinion angle that's created with that much lift. Your boots seals start to fail. I suppose you could drop the t-case, but that's not really done on JKs. Read this: http://www.jpmagazine.com/techarticl...fts/index.html

The axles also become a little short eventually relative to the height. And I think it's worse in the 2012s because of exhaust piping or something that interferes with the wide factory shafts.

Some good pics from a pre-2012: http://www.jkowners.com/forum/showpo...1&postcount=10

How much lift do TJs require to clear 35s with room to flex like as pictured? Would they not not need new driveshafts by that point? (Serious question - not being snarky.)
Like 3-4" I believe. A 2" coil + a little body lift is common to clear 35's. Also dropping the TC like you mentioned keeps the DS angles. A
motor mount lift is simple and easy to do also. I don't think new drive shafts are needed on the Tj unless you go super extreme. I think with a Tj you need a SYE if anything??
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Old 01-12-2012, 08:26 PM   #9
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Quote:
Originally Posted by MTH
The axles also become a little short eventually relative to the height.
Edit - Meant "driveshafts" here.

Quote:
Originally Posted by kjeeper10

Like 3-4" I believe. A 2" coil + a little body lift is common to clear 35's. Also dropping the TC like you mentioned keeps the DS angles. A
motor mount lift is simple and easy to do also. I don't think new drive shafts are needed on the Tj unless you go super extreme. I think with a Tj you need a SYE if anything??
But you would probably need new driveshafts to clear 35s if you didn't drop the t-case, right? Especially if you didn't use any body lift, but instead went with a straight 3-4" suspension lift? I've got to think that's going to generate crazy angles otherwise--just like on a JK.

I've heard non-rubi TJs need slip yoke eliminators, though I truthfully have no idea what that really is. Don't know what a "slip yoke" is or why it must be "eliminated."

Is the motor mount lift related to the body lift? Sounds like it, but again, I'm painfully ignorant pre-JK.

I do know my brother's got my dad's old TJ and I have PLANS for that jeep. Our dad's gone now and we've got to do something he'd think was cool.
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Old 01-13-2012, 07:33 AM   #10
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Quote:
Originally Posted by MTH

Edit - Meant "driveshafts" here.

But you would probably need new driveshafts to clear 35s if you didn't drop the t-case, right? Especially if you didn't use any body lift, but instead went with a straight 3-4" suspension lift? I've got to think that's going to generate crazy angles otherwise--just like on a JK.

Yes. I think a TC drop and SYE is all that's needed for a 3-4" lift. Beyond that, longer driveshafts.

I've heard non-rubi TJs need slip yoke eliminators, though I truthfully have no idea what that really is. Don't know what a "slip yoke" is or why it must be "eliminated."

The slip-yoke is between the drive pinion gear shaft yoke and the output shaft yoke, and is designed to slip and therefore create the extra length to the drive shaft when moving up and down.

Is the motor mount lift related to the body lift? Sounds like it, but again, I'm painfully ignorant pre-JK.

I don't think it's done for any other reason.

I do know my brother's got my dad's old TJ and I have PLANS for that jeep. Our dad's gone now and we've got to do something he'd think was cool.
Owned a Tj for 10 years and still don't know everything

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