Engine/Transmission (1994 - 1998) Dana 70 Trac-Lok

[PRohr]

The Trac-Lok unit in my D70 is chattering. I am running Amsoil SVG-75w-140 oil and two bottles of the Amsoil LS additive. I can feel the vibration on turns and I know it's the LS unit. The fluid is not that old and I changed it when this started... . I figured it might just take a bit to work the additive through... . nope. Do I need to use the Mopar additive? The truck has 250K miles... time for a rebuild of the Trac-Lok? Has anyone here rebuilt one? Special tools needed? I've read through the FSM and I have rebuild rear diffs but never a LS unit.

 

[KBurgoyne]

if its seen 250k miles with some towing its probably starting to waer out. west coast differentials has complete directions on their website on how to rebuild an axle along with a tool list.

 

[Vaughn MacKenzie]

I've had to put 3 bottles in my Dana 80 before, but at your miles it's quite likely the clutches are pretty well done.

 

[PRohr]

Yeah... I might try dumping another bottle of additive in to see before I rip it apart. I might just try and find a D80 and put that in vs. rebuilding and putting any money in this 70 though.

 

[LHastings]

I had the same problem. I changed the lube and additives with no help . I finally replaced my clutch pac. It was not that hard of a job. I got a differential spreader but did not have to use it. Just make sure you pay close attention how the clutches are arranged when you take it apart. One tip is when you put it back together you can push down on the assembly by hand to check to is if the clutches are splined correctly, if they don't push down all the way you you have one that is miss aligned .

 

[PRohr]

Thanks. I was wondering about the case spreader. I thought about ordering one but everytime I've done a diff I haven't needed it. I stopped by the dealer and bought a bottle of LS additive..... for $7 it's worth a shot. If I do have to rebuild it where is the best place to get the clutch packs from?

 

[PRohr]

Just got back from a test drive. No more chatter. I guess time will tell if it stays like that and if it does I know I need 3 bottles of Mopar LS additive from now on.