Did I kill my Diff?

[wjburken]

I would pay $200 more to get a True Track instead of an open diff.

 

[OR VietVet]

I would pay $200 more to get a True Track instead of an open diff.

Without a doubt

 

[Doubeleive]

Make sure it's a Eaton Detroit, not some other garbage, leave yourself open to possible additional cost if he gets in there and finds the pinion/bearing is shot to often that is the cause of the vibrations that and worn u-joints

 

[ks03]

Any chance you just have a u joint trying to lock up on you?

 

[blown240]

It is an actual Eaton True Track...

Im not sure if I have a u joint going bad. That would be a pretty big coincidence if that happened the day after I changed the diff oil...

 

[Doubeleive]

It is an actual Eaton True Track...

Im not sure if I have a u joint going bad. That would be a pretty big coincidence if that happened the day after I changed the diff oil...

that's a good price then my last one ran me about $1200, I don't remember if that included the pinion or not

 

[ks03]

Im not sure if I have a u joint going bad. That would be a pretty big coincidence if that happened the day after I changed the diff oil...

The coincidence... if the fluid was changed on a drive on rack, that would be odd to effect the u joint. If the fluid was changed on a hoist that lifted by the frame, extending the suspension and moving the driveshaft to a sharper angle than typical, then it seems reasonable to effect a u joint.
Either way, dropping the shaft and checking free movement is fairly noninvasive. You could also do it, find a real stiff joint, replace it, and have no effect on current symptoms

 

[Wylie_Tahoe]

Running the truck in drive with the rig lifted off the ground by the frame, should still have the prop shaft well within a safe operating angle. Should not hurt a u-joint. Modified suspension could be different story.

 

[ks03]

A perfectly good u joint shouldn’t be affected by that. I’m suggesting if it was already the source of the noises prior to the fluid change.

 

[swathdiver]

Buy a used rear axle and swap the whole thing out, about $400-500 plus fluid and labor if you have someone do the work.