What did you do to your XJ/MJ today? - Page 6110 - JeepForum.com
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post #91636 of 91821 Old 09-16-2019, 09:10 AM
S8NNG8
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Originally Posted by kadetklapp View Post
And speaking of stupid questions, nasty little vibration and some noise on deceleration post-lifting 4”....is this indicator of needing a t-case drop?
I'm sure you know that an SYE is the proper fix. But yes, a remedy is needed. And soon, or it'll end up being your pinion bearing in the axle.


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post #91637 of 91821 Old 09-16-2019, 11:56 AM
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Thanks. I'm a car nut...love working on them, driving, racing, reading...anything/everything cars. We've had a few Grand Cherokees but this is the first XJ. We've only had this a few months, and I can tell why they are so popular. This was my mother-in-law's car. She passed away last year, and we drove it from Nashville to San Diego, and I absolutely fell in love with it during that trip. It has a lot of sentimental value, especially to my wife, which is why we want to just clean it up a bit, not go crazy with mods, and let it be a good memory for my wife of her mom. Unfortunately, recently I've been watching Rust Valley Restorers on Netflix and Restoration Garage on Amazon so I'm ready to pull this thing apart and do a ground-up rebuild to get it factory-new condition. Realistically, I know it wouldn't be worth it but the OCD/perfectionist in me won't let it go.

Definitely lots of info on the internet. Some of the stuff I've seen people do on YouTube is crazy though. Almost seems some people make it up as they go along. Forums like this are great because it's people who generally know what they are doing.

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Originally Posted by bluejunior View Post
Welcome!

Feel free to ask anything, there are a few of us around. Few things I always tell people:



Don't be afraid of search. Google, youtube, forum search here, NAXJA, r/CherokeeXJ, and many others. XJ's are wildly popular and people love modifications, fixes, and restorations. Most common jobs or problems you'll run into have been documented to death, often with step by step picture laden threads or videos.

Make a build thread of your own where you take pictures and detail out what you do. It adds to the documentation for the community, but it also gives you a log of your work so when you can't remember what you did or what parts you used you've got it down in writing and dated.

Have a little fun with it. Even if it's not your car, projects should be enjoyable. There are a ton of little upgrades you can do with these to make them more comfortable or utilitarian.
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post #91638 of 91821 Old 09-16-2019, 02:53 PM
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Quote:
Originally Posted by S8NNG8 View Post
Quote:
Originally Posted by kadetklapp View Post
And speaking of stupid questions, nasty little vibration and some noise on deceleration post-lifting 4”....is this indicator of needing a t-case drop?
I'm sure you know that an SYE is the proper fix. But yes, a remedy is needed. And soon, or it'll end up being your pinion bearing in the axle.
Damn...why ya gotta be the voice of reason...

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Former Police Car assigned to 54-26, RIP.
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post #91639 of 91821 Old 09-16-2019, 03:28 PM
Luke95
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You called?

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post #91640 of 91821 Old 09-16-2019, 03:29 PM
Luke95
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At this point it's kinda nice to see some of the simple questions come up and help out a new member. It's been slowly growing back. Before you know it Luke95 will be filling threads with wheeling pics and converting all the newbs to radicals&#x1f604;
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Originally Posted by kadetklapp View Post
I remember Aircruiser and a few others. And all the 16 years olds wanting to know if 40s would clear stock suspension and me asking of Rough Country is really THAT bad bc I was (and am still) broke...
Can confirm that 40s will fit with stock springs

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post #91641 of 91821 Old 09-16-2019, 04:04 PM
kadetklapp
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Quote:
Originally Posted by kadetklapp View Post
And speaking of stupid questions, nasty little vibration and some noise on deceleration post-lifting 4”....is this indicator of needing a t-case drop?
I'm sure you know that an SYE is the proper fix. But yes, a remedy is needed. And soon, or it'll end up being your pinion bearing in the axle.
Truth be told I’ve never ridden in a lifted XJ let alone driven one. My last XJ I bought a 2” BB for and it never came out of the box.

**1997 Jeep Cherokee SE**
Former Police Car assigned to 54-26, RIP.
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post #91642 of 91821 Old 09-16-2019, 05:24 PM
S8NNG8
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[Can confirm that 40s will fit with stock springs

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There's he is!!!

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post #91643 of 91821 Old 09-16-2019, 06:07 PM
Luke95
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There's he is!!!
I still do stuff

https://www.instagram.com/p/B2ckvRLH...=1lstelelfcro3

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post #91644 of 91821 Old 09-16-2019, 08:58 PM
bluejunior
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Quote:
Originally Posted by kadetklapp View Post
Truth be told Ive never ridden in a lifted XJ let alone driven one. My last XJ I bought a 2 BB for and it never came out of the box.
Just for clarity: A TC drop makes the rear angles better, but the front worse. It also doesn't do anything to fix the increased distance between teh rear axle and the TC after the lift. Lift enough and try to drop, you'll ruin the front angles, pull the driveshaft into little enough spline engagement that the output, shaft or both get chewed up, or the whole damn thing will fall out durig flex.

3-4" it usually works out okay for light duty stuff, but an SYE with a proper length driveshaft absolutely is the right fix.

Lifted, Locked, Stiffened

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post #91645 of 91821 Old 09-17-2019, 03:03 AM
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What did you do to your XJ/MJ today?

Quote:
Originally Posted by kadetklapp View Post
And speaking of stupid questions, nasty little vibration and some noise on deceleration post-lifting 4....is this indicator of needing a t-case drop?

Before you drop the T case, pull that rear shaft and just check that your u joints are in good shape. My fiancs Jeep is at 3.5-4 of lift and I was able to remove the shine the lift springs came with (they would hav been the right angle for an SYE, but wrong for stock shaft) and replace one U joint and got rid of the vibration without the need to drop the crossmember.

Also, if you do determine you need to drop the crossmember, you can do it a washer or two at a time and you may find that only a small amount of drop is needed to get rid of your vibration.

As Blue said, dropping the T case will improve the rear driveshaft angle, but make the front worse. Everyone does it anyway because the rear shaft has a load on it at high speeds where the front does not, so your much more likely to feel a vibration from the rear. In the end, SYE is the proper fix for the long term.


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2000 Silver XJ, 4.0, AW4 with 350k+, Locked C8.25 w/ Chromos, Trussed hp30, 4.56's, Stiffened, IRO leafs, RE coils, custom 3 link, WJ knuckles, 35's
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post #91646 of 91821 Old 09-17-2019, 06:46 AM
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Truth be told I’ve never ridden in a lifted XJ let alone driven one. My last XJ I bought a 2” BB for and it never came out of the box.
30,000+ miles with my 4.5" lift with a t-case drop and no vibes or problems. I still have the original u-joints right now. No problems doing it on my other 2 XJs either. You should see how short the driveshaft on a TJ is. On a TJ with a 4" lift, the "right" fix is a SYE, DC driveshaft and all 8 adjustable control arms. My old 05' had a MML (motor mount lift) and 1/2" t-case drop with washers. After 8 years all was still good.

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TheBoogieman is a jerk.
03' Rubicon/Zone 4.25" combo lift/Rancho 9000XL shocks/5.13 gears-35" MTZs/BM brakes
99' XJ / 5" BDS lift/ 33" DC extreme country MTs. Jeep #18
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post #91647 of 91821 Old 09-17-2019, 08:24 AM
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Quote:
Originally Posted by kadetklapp View Post
Truth be told I’ve never ridden in a lifted XJ let alone driven one. My last XJ I bought a 2” BB for and it never came out of the box.
30,000+ miles with my 4.5" lift with a t-case drop and no vibes or problems. I still have the original u-joints right now. No problems doing it on my other 2 XJs either. You should see how short the driveshaft on a TJ is. On a TJ with a 4" lift, the "right" fix is a SYE, DC driveshaft and all 8 adjustable control arms. My old 05' had a MML (motor mount lift) and 1/2" t-case drop with washers. After 8 years all was still good.
Sometimes you get a good bandaid that sticks.

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post #91648 of 91821 Old 09-17-2019, 12:25 PM
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Sure, I ran a tcase drop for years until I managed to snag an SYE in a parts swap and many people do it without issue. Just need to make sure the new folks know the trade-offs in terms of risks and weaknesses even if an actual failure never manifests for many. Just about every option in an XJ is a tradeoff, if only in terms of something as simple as cash.

Lifted, Locked, Stiffened

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post #91649 of 91821 Old 09-17-2019, 04:46 PM
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I appreciate the input, seriously. That’s why I came back to the forums. The fact is I’m not a mechanic, I’m a self-employed quick lube jockey for my own fleet. Despite the knowledge I’ve gained here when putting it in practice I’ve thrown in the towel hence why I farmed out the lift to an actual mechanic.

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Former Police Car assigned to 54-26, RIP.
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post #91650 of 91821 Old 09-17-2019, 04:48 PM
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I never thought my Jeep would go this high. To be honest I’m excited, but I didn’t anticipate that my Amazon/Craigslist/Facebook Marketplace mishmash of new parts would actually hoist this pig that high... Hence, my sudden unanticipated need to correct driveline angles.
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