after a small 3.5 lift on my xj, drive shaft is vibrating,, ive tilt the axle and still have a problem (joints are new) do i really need to drop my t-casse ? thanks for helping.

 

you want to match the angle thats at the axle to the angle thats at the tcase, u can buy the angle gauge for like $7 bucks at home depot, and if you cant make it work with that, than yes, dropping the tcase will more than likely help

 

you shouldn't need a t-case drop with only a 3.5" lift... check that your u-bolts on your axle are tight... (btw this should be in OE cherokee tech, not Fabrication)

 

Moved to Advanced Tech.

 

Actually Its adv tech.

& depending on his jeeps year. YES he will need one. If he has a 97+ he will need one. I have yet to meet someone with the new years over 3 who doesnt need one. Mines at 3.5 and I had HORRIBLE vibes. Installed a drop.. almost 0 vibes. (btw it vibed some stock...actually does it less now though haha)


I made mine for less than 10 bucks and took less than an hour total.

 

How bad are your leaf springs?

 

Awe beat me too it, only if I hadnt forgotten to hit "reply" haha

 

Why would that have anything to do with his sy vibrating in his tcase?

 

thanks 2all of you for your help !

 

I also had to do my ninja work and move it, and did so before posting.

 

well now you know of atleast 1 person.. My 99xj has a rough country 3.5" lift and i have no issues with my rear d-shaft vibrating

 

Is this a Rubicon Express 3.5" lift by chance? If so they are known to actually sit about 4.5" in the rear, which is definately enough to potentially cause some vibes. I just installed my so-called "3.5 inch" lift (bastard pack rear, but about the same height as the RE full packs) and had AWFUL vibes at every speed except 40-50 mph. Installed a t-case drop and it definately helped, although I still have vibes between 25-35 mph. Not all XJ's are the same when it comes to driveline vibes as there are different driveshafts used, different t-cases, etc. depending on the year and options of your particular Jeep.

Short answer to your original question- if you know the u-joints are good then yes, I would definately try a t-case drop. They are only about $20 and are very easy to install as long as you don't have a frozen stud (I was lucky, mine came right out and it took maybe 30 minutes to install the drop spacers).

 

thanks' i'll try it out 4sure, btw(its a home made add 2 leaf + a triangle block for my axle,,)

 

its a 1999, but some say a MT might not vibrate compared to an AT ..

 

If you wanna see my homebrew tcase drop I'll show, it costed like literally 5 bucks or so.

I left the stud in place, used a cuppler on it, with a bolt.

Then since my Ace had only two of the copplers I needed I got ones that were way to big, cut them down to size, ran my bolt through them into the tcase. Its less jank than it sounds. Haha