I just bought a 79 blazer 400/T350/203 and towed it 40 miles home, tranny and t-case in neutral. Now it has a bad clunking noise up front. It only happens when the front drive shaft is in. It doesn't matter if the hubs are locked in or not. I pulled the diff cover off and didn't see any metal shavings. Drive shaft looks fine. Any help wood be greatly appreciated. Thanks.