Thomas makes some very cool stuff!
I've had Durango gear diffs in my B44 for... is it 3 years now? Custom job by Thomas - never any issues or maintenance! And finally NOW AE offers it
The XB4 is much much quicker now though on astro
Only problem I've had with the car is the drive axles, both center and wheel. You need:
-pins with flat field (TC part)
-"cylinder" with windings + set screw (TC part)
-alu securing cups (option part)