mayb its some worn out transfer case linkage? check the bushings on it i kno that mine r shot and they make a weird noise pretty often.. o btw u should look into the hack n tap nd xj front shaft, its a great way to get ur sye done and save a bunch of cash
on the tera flex sye dont u need to remove the trasfercase and split it open to install it? seems like thats gona take a lot more time and work than just grinding and drilling a hole to me but i might be wrong. i heard you might be able to grease ur slip yolk on ur rear driveshaft, sometimes the grease dries up and it can make a clunkin noise check the FAQ i think theres a write up in there on how to grease it
Intermittent clunk -> If this is not a bad u-joint, then it is normal wear of the differential. This is often called drive line lash. Years and mileage increase the spaces between the small parts inside the diff. As you shift the tranny, the slack is taken up, and results in a clunk.
Rhythmic ticking -> Inspect the rear brakes for something thing that is slightly out of place or alignment and rubbing.
Clunk when stopping -> Grease the rear drive shaft slip yoke.
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i only have 143k miles on the jeep and its always been babied. no accidents and the previous driver was a grandma...so i am kinda thinking the diff is not worn out. im going to go check the engine mounts and u bolts.
If it is my u bolts or drive shaft ill live with it till i get the tom woods ds and sye.
i think u should look into greasing the rear DS, that usually gets rid of clunks.
Also u can shift into N for about 3 seconds and then shift into R and that helps sometimes.
My old XJ had the same issue when I first got it. I greased the yoke and paused for a second in neutral before shifting to drive and never had the clunk again (or any other problems) for the couple years that I owned it.
ok....heres the update...i went outside this morning and tooks a look at the 3 possible culprits.
Motor and tranny Mounts
The Differential might be a problem, It definitely has a leak i think around the plug...how do i replace that and how do I know if there is enough fluid in there?
U-Bolts have no give to twist the drive shaft. However this does not eliminate it as a culprit. they could need to be drivin a while to show the give.
Last the motor mounts scared me at first look but relieved me upon second look i think. The top layer of rubber per say has peeled back much like a new tire looses a layer of rubber to the elements when first put on. The mounts may have come like that from the factory that way. The rubber under neath the peeling layer is black and smooth and has no dry rot or deep cracks. they almost look brand new (bought the jeep from a dealership so its possible they replaced em.)
The Transmission mount i i almost know for a fact is brand new. Very squishy, no dry rot and no cracks what so ever.
Lastly if the engine mounts where bad they would allow the engine to move quite a bit when starting and revving.
Starting: minimal shake no more than a 1/4"
Revving: absolutely very little movement... 1/8" maybe
Doors dont shake when opened while engine idling.
I think the vehicle is fine i think it is the u bolts....what do you guys think and what should i do bout the diff.