WHY I JOIN EXP/FOR

[Cuco]

I’m a mechanic by trade but I don’t know everything. The reason why I joined this forum because I have a driveline vibration that drives me crazy. Only happens when I reach 60 mph to 75 mph when I hit 80 mph the vibration goes away , just looking for answers to solve my problems my colleagues can’t even help me they don’t know either , been having problems for approximately over 5 years , so let me tell you what I did to my 96 explore , lower ball joint , New upper control arms , Front & rear brakes and rotors , New shocks all around , front new driveshaft , front new hub bearing , had the rear driveshaft service by a machine shop by put a new u-joints and have it Balance , New tires all around & road force balance all tires , just ordered a transmission mount waiting for to come in the mail & inner and outer tie rod too, my guts is telling me once I installed them problem still going to be there , I think my transfer case is messed up or I need a rear differential , I even remove the front driveshaft and drove my truck and the problem is still there , HELP

 

[masospaghetti]

I've had this happen three times.

First time, it was bad differential carrier bearings.
Second time, bad axle bearings.
Third time, bad driveshaft*.

* I tried replacing the u-joints which did nothing. I replaced the entire shaft with a used one from the salvage yard, and the problem went away. I think the driveshaft was bent.

I would try a replacement driveshaft first, then replace the axle bearings. Both of these are fairly easy and inexpensive. Carrier bearings are a bit more work.

 

[Cuco]

I've had this happen three times.

First time, it was bad differential carrier bearings.
Second time, bad axle bearings.
Third time, bad driveshaft*.

* I tried replacing the u-joints which did nothing. I replaced the entire shaft with a used one from the salvage yard, and the problem went away. I think the driveshaft was bent.

I would try a replacement driveshaft first, then replace the axle bearings. Both of these are fairly easy and inexpensive. Carrier bearings are a bit more work.

I think the machine shop that rebuild my rear driveshaft would’ve told me it was bent but my rear DEF I think I will get it rebuilt