Alright, here is the lowdown. A short time after I lifted my jeep from 2.5" to 3.5" I have noticed issues with the drive line. I am not exactly sure what is going on. But when I start out slow sometimes, for example on a cobblestone road in 1st or 2nd, the jeep starts to buck. If I step on the gas it goes away, but as soon as I let off again it seems to make a clunking sound and starts up again. This is driving me crazy and I cant figure out what is going on. I did notice on my front stock drive shaft the rubber boot is sliding back and some grease. Everything look ok under the jeep. There is some some play when I rotate the rear driveshaft back and forth. What does everyone think is my problem??? Trans, driveshaft, rear end??? I have always maintained all my fluids and use royal purple. Just to give you a run down on mods I have 3.5" RC series io lift,quick discos, wheel spacers, running 33's. Also when accelerating on the highway, if I let my foot off the gas abruptly it makes a clunking sound in the rear. Whatever is going on I am sure it's going to cost to have fixed. Any insight on opinions are appreciated.

2007 sahara
69000 miles
6 speed manual
3.21 gears
D44 front
D3o rear

 

Did you get an alignment when you lifted it? It also may be the trackbar is worn and causing death wobble. Make sure your trackbar is tight and is not "wollowed" out.

 

free play with your shaft is AOK, it's the play you pay for that you gotta be careful with...

 

I'd dump out the Royal Purple to start....scary bad oil. Try Amsoil, Brad Penn or even Mobil 1... Any of those are much better lubes.

 

Thanks everyone for the feedback. I will check these possible issues this weekend. Hoping it is my gears so I can replace with 4.56.