Hey guys, I just installed my 3" Zone AAL lift this weekend. My jeep only has 90K so the existing leafs are still pretty strong. Anyways, it hasn';t settled any yet but the front ended up netting 3.5 inches and the back a smidge over 5 inches!! I am sure that will settle some but this jeep looks HUGE for a 3 inch lift right now. LOL My question is that I am getting light vibes alost from the get go....nothing too serious. I assume a TC drop would cure this and down the line do a SYE. I am more curious about when I am going over 35 MPH and I let up off the accelerator I get a short grind sound.....almost feels like something turning over near the rear. Once I accelerate or remain coasting it is fine......just when I let up off the gas is when it happens. ANy ideas?

I will get some pics up this week of the lift etc.

 

same exact 2 problems, i think in the rear u joints being worn and a tc or better yet a SYE will solve the vibes

 

Check your driveshaft angle. If the rear pinion is pointed up too high it might be causing the ujoints to bind up when you let off the gas at speed.

 

Your front ujoint on the rear shaft is binding up, there is not a lot of angle in that front ujoint before the slip yoke contacts the driveshaft.

 

I had the exact same issue. I got the impression if I wasn't putting any rotational pressure (accelerating or coasting down a steep incline) on the drive shaft something else was taking the extra pressure resulting in that grinding sound. Anyway, SYE and problem solved.

 

yep, and when you decel, the pinion will dive down, making the angle worse.

 

How long before any damage is done? I can spring for the SYE in a few weeks I think. I won't do any major damage will I until then? Is the SYE a hard install?

 

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Im having the same exact problem. Id like to do an sye but im gonna try a tc drop first.

 

bump

 

Go to you tube and look up "hack n' tap SYE" and click the first vid. See if it looks like something you can do. Also consider a small axle shim. If you can't do the SYE quickly, then a combo of a 1" TC drop, front DS, and like 3* axle shims may solve the issue for less than a new SYE kit.

 

I would like to get an answer for this. I just did a 3 inch lift on my XJ and have a TC drop kit on the way. Until then is it ok if I DD my rig?

 

Yes how long before any damage is done? I just put new leafs on mine and get vibs as well. Since the rear is now higher then the front. A tc drop is in the works. Just need to know how long I can go.

 

The grinding is the two yokes hitting each other. I should take a picture of what my old drive shaft looks like looks like. But when its binding its putting pressure on the tc bearing. I'd go with a cheap hack n tap as soon as you can. Im on a 5.5" lift so mine was pretty bad. No damage to mine tc bearing though

 

I think this was spot on. I finally got to installing my tc drop and the grinding is gone. Just wanted to update the thread for any future searchers.