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If you are using a Truetrac do NOT use synthetic oil. Switch it to old fashioned dinosaur oil. Castrol, Mobile, Shell not Valvoline (per Eaton tech service). Running summer weight / extreme use 95/140 weight will help as well.

600 miles of NM & Az up to 9000' and 100 degree temps, mix of forest roads and highway. With the Castrol 85w-140 in the differential its...quiet. I got a couple suuuper soft chirps near the continental divide but they we so light that unless you were really paying attention they would have...

With the Castrol 85w-140 in, I went for a 30 min drive...and its about 98% quieter. Encouraging so far, if I make it through my seven hour desert trip this weekend with the same results I'm gonna call this one closed. Now it is quite possible that the issue was the change in oil weight, and...

Straight line any speed, completely quiet. Turning at slow speeds you can hear it, right or left...at some point normal driving noise drowns it out, or its not there. When I leave for work in the am, and everything is cooled off its totally silent, until about 20 minutes later it starts to...

For the really fast mountain roads...I take my Subaru. That said I've got a 99' XJ with 3.5" RE front/rear, Detroit Truetracs front/rear with 5100's all around. Night and day difference from a stock replacement shock (blue Napa's are built by Monroe, just like most OME's). For a daily driver...

Nothing else made noise until the truetrac went in. Put it up on a lift and spun up the front wheels both manually and with 4WD engaged, went from full lock side to side with nothing goofy, no unwanted noise. It only makes noise under load so getting it in the air revealed nothing...

As its only two weeks old and under warranty for a year from date of purchase I'd be reluctant at best to rebuild it at this point. Right now I'm trying to collect as much relevant information as possible and either live with it or send it back. The entire front end is either "new or improved"...

I've got a 99' auto 4x, Chrysler 8.25 rear, Dana 30 front that I recently installed Detroit Truetracs in. Mostly a DD but with lots of use in the desert sand in the summer, NM & Co snow in winter. The rear Trutrac is dead quiet, however the front has a soft squeak that sounds like a fingers...

Awesome thread. My build plan is more minimalist, DD/hiking/climbing/camping, but I'm only six months in...you know how these things morph over time. Just finished putting Detroit Truetracs & ARB covers front and rear since I spend so much time in sand/snow, now moving on to gear storage and...