I have a 92XJ with a rough country 3" lift. For the longest I had the stock 235's on it because I could not afford new tires.
Right now I am actually waiting on a phone call from the tire store telling me that my new 31" are installed.

What I am wondering is if I would be able to lift it another 1.5" without a SYE. I have the spacers front and rear already but I did not put them on because 4.5" lift would look terrible with stock 235's. I could shim the axles, would this be enough or no. Just let me know your concerns or if you have similiar experiences.

 

It depends on the year of the vehicle and axel type. Shims would help. If that doesn't do it it's either the TJ or YJ wrangler that has a longer slip yoke (not sure which one). You could grab one from a jy for cheap. Also a TC drop may help. Or some auto shops can lengthen your driveshaft. Try it. Worst that could happen is you can't correct the vibes and have to remove the extra 1.5 spacers.

 

Yeah I thought about just throwing them on and trying it out. I didn't know that about the wrangler driveshafts, thanks!
I tried the TC drop and once one of the bolts broke off I quit there. Will try to drill them out this summer.

 

I'm in that same boat as you. I can do a lift but don't wanna deal with the whole SYE headache. I'm looking to do a 3" lift. Do you have any vibes with the setup you had? Did it include the TC drop? If so how far did you drop it.

 

give it a try.....you might not like the look of 4.5" of lift on only 31's

 

Just because you lift doesn't necessarily mean you have to do a SYE. I currently have a 5" lift on the rear without vibration. I had it at 6" and lowered it an inch because the driveline would not handle that much flex without going to a wrangler slip yoke. The thing is that when lifting the angle on the differential has to be the same as that of the transfer case. If it is, the drive line will not vibrate. Stick a wedge in there and it will and then you will be doing the SYE and new double cardon drive shaft. Just make sure your angles are the same.

 

So driveshaft vibration doesn't usually come from the yoke moving out too far but rather a difference in angles at the TC and rear diff? Completly different from what I've read but I gotta admit that does make sense....

 

there is a lot more to it that that



and any one that has more that 3.5 lift with no tc drop already has the high angle yoke

 

Mine was a very basic setup. coils add a leafs and shocks. It's been a couple years but I did have a slight vibration at speeds around 70. My jeep is getting pretty beat up and doesn't like those speeds anymore so I cruise around 60 maybe 65 with no problem. I just got back home with my new tires so I don't know how those will do.
I bought a TC drop but broke off one of the bolts and stopped real quick until I can find time to drill out all of them. If you can drop yours 1" seems to be the most popular.

 

So do you think a 3" lift with shims and possibly a TC drop would be vibe free?

 

a 3" yes
but you were talking 4.5 and that can work with a tc drop
depending what yoke you have

 

i did the 3" with 2" spacers/bastard pack on 33" tires.. Flexis great, No vibes, NO tcdrop or SYE..

I did get a free IRO tcdrop so i will be installing it, but it has not been needed yet.

 

it all depends on the jeep. i would be looking at getting a leaf pack degree shim about 3 to 6 degrees is a good range and will help point the axle back at the jeep transfer case. and most likley a drop kit for the t-case about 1 inch should do. or you can just spend the money on the s.y.e. and do it right

 

Isn't it better to just do a full lift then add spacers/shackles? I read it was cheaper but not the best way for lift.

 

A full lift is better in one respect, it will articulate more. if you are just mall crawling, spacers and small lift kits will work fine. But if you are looking for maximum off road performance, go with the full lift