The weakest part of the TTB is that stub shaft sticking out of the differential on the passenger side. What really sucks is that in stock form you have to drop the third member to change it out in the event that it breaks, which makes it not really a viable trail repair. The best thing you can do is obtain a stub shaft out of a Dana 50 TTB and swap it in. As previously mentioned, when you do the swap go ahead and leave the c-clip that retains the stub shaft out of the differential. That allows the shaft to be easily swapped in the field if needed. Instead of the c-clip most guys I know who have done this swap have put a small spring in the shaft slip joint to keep the shaft properly pushed in. Once you swap out the stub shaft for a stouter one the next weakest point on the TTB is a toss up between the hubs and the outer shafts, which is right where you want it. I broke three Warn Premium hubs and one outer shaft on my TTB before I sacked up and went to a D60 solid axle in the front of my '90 Bronco, and that was with running 36" TSL's for about two years. No matter which way you decide to go, buy hubs with a lifetime warranty, and don't loose the receipt.