So I'm new at this but here it goes.
I have 98xj that im putting a 4.5inch rc lift on. I bought the kit used but only for about 6 months so its in good shape. Finally after about 6 days of working mostly on my own for bout 3 hours a day i got everything on. I went to drive down the road and i started getting vibrations from the transfer case i believe but i put the drop kit in. Does anyone have any idea what i should do to solve this?

 

you need a slip yoke eliminator and dual cardan driveshaft.

the t-case drop is just a band-aid and doesn't work for everbody.

 

Have the leaves settled all the way? And I think the ax-15 cross member drops the t-case little with out losing ground clearance if not yea def the sye I'm just cheap lol best of luck

 

Maybe the ujoints

 

looks like i'm spending my next 2 paychecks on an sye. would it hurt to drive the car with these vibrations for about a week while i wait for it to ship? it only vibes between 30 and 35. thanks for input

 

You'll be fine i just wouldn't stress it by wheeling

 

I just did a 3" lift and I'm noticing minor vibes in the steering wheel. I've already rebuilt the rear driveshaft when I swapped out the Dana 35 to an 8.25. So next I'm going to rebuild the front driveshaft. I think the u joints are worn. After all those years of working one way when you change the angle all of a sudden, they don't like that. I would try that. They probably need to be replaced anyway.

 

Check for loose steering / wheel bearing-ujoint play

 

post pics of drive shaft at tc ,rear yoke and whole shaft can tell alot more by looking

 

You do need an SYE, there is not much range of movement with the stock slip yoke. If you're getting a vibration on level ground, just think of how much of a bind the ujoint will be in if and when the rear axle droops into a hole.