Do differential covers really help and if so how?
They help by holding the axle bearing caps in place and preventing flex. Flex will kill you as it allows gear teeth and axel splines to come out of contact with their proper mating surfaces and then Bang! you break.

I did think the rear took a dump once. Was popping and grinding like a *****. Took it all apart and could not find anything wrong
Put it all back together and it's been fine ever since 
Big fan of the girdle.



