Sure Grip unit feels much better than Eaton TruTrac did..

I built Jbc426's True Trac equipped third-member (among approx 100 others) about 5 years ago. At that time, I did not hear any complaints from my customers. See below:

Eaton Truetrac noise? Doctor Diff? | Moparts Question and Answer | Moparts Forums

In 2015 I started hearing complaints from a few customers regarding noise associated with the units. See below:

truetrac noise, finally found it, not sure I can fix it!

Even though the problem was hit-or-miss, I quit selling True-Tracs for over a year UNTIL that production run was depleated. I recently re-listed True-Tracs because I haven't heard any complaints with the latest production run.

Again, the problem was a crap-shoot. Read all the reviews on Summit, below:

Eaton Detroit Truetrac Differentials TT70P52790

The issue was not exclusive to Mopar 8.75" rears. Quality control on the Ford 8.8" version also suffered.

BTW, I 'm about to release my own version of the 8.75" True-Trac.