if your driveshaft is fine, its either your breaks or something in the differential. To check the rear, you just jack the wheel up, take it off and then pop the drum housing off. its that simple.

I'd also more closely examine my driveshaft to make sure it didn't lose a weight somewhere...the spare I have in my house has TWO weights, one at each end of the DS

 

just got home after a 200mile drive and its still shaking. i have these circle things on the top of my ds almost look like weights them on the bottom i have the rectangle one.

 

Alright UPDATE. I just drove 200 miles this mornign and the shake is def in the rear. On a cold start when i push the brakes just a little bit it jerks me like they lock. I dont know id that is causing the shake i doubt it. Today i am going to check the rear brakes. U-Bolts everything seems nice and tight. Tires i just got them from a guy off CL they are only 2 weeks old and they have weights, he told me that they were ready to go. Alright so then i looked at my shocks and nothings wrong with em so thats ruled out. Now on to the Drive shaft, i replaced the u joints id say about a 2 months ago and the drive shaft looked fine (rusty but fine). So i dont know what is going on. the first week i bought it (july 27th or something) it didnt shake at all then after that the shake happend. so its been a good 6 month problem.

 

Could be a bent axle shaft. That would make the drum turn unevenly and lock the wheel. Put the rear on jackstands and start the engine in 2wd and shift in drive. Observe the wheels if they are spinning straight.

 

i took it to a shop and i had a bad wheel in the back so it was making the drum like hop. so he told me replace the tires so i did and still shakes....

 

did you replace the rim too?

 

yup all 4 rims and tires

 

do what i said in post 49 then.

 

ok then if that is the problem how hard is it to change the axle shaft

 

easy easy...

 

have a write up or anything?

 

but lets see if it's that or not first ok? then we'll do the axle swap together in case..

 

ughh this darn jeep lol. gf wants me to sell it. its my DD so its very annoying. i drive about 400miles round trip every weekend so i have to drive on the highway going like 65

 

man i dont know wat to tell you i have been thinking about this since you said something i am stumped

 

u and me both bro