I wasn't sure if this should go in the suspension or drive train section, maybe both. Anyway, I'm getting more of a "thunk" coming from the rear end of my car whenever I come to a stop and it downshifts into first. I also get it when I driving slow like in parking lots when I'm on and off the gas or in a line of traffic going slow and it's in first gear. It's getting pretty annoying. I've checked all the nuts, bolts and bushings on everything in the rear end, suspension and everything is tight and the bushings are good. The car only has 86, 0000 miles on it. It's a 95 tbird with new rear swaybar end links and a trac loc rear end. A few months ago I upgraded to 3:75 richmond gears, F150 S-clip, 93 Mark VIII aluminum driveshaft and forced lube tailshaft. It seems like it was more noticeable after I had all that done but I'm not sure because my end links were making so much noise before, I didn't hear the "thunk". You can actually feel it too when it does it. I took it back to where I had the gears installed and he double checked everything and said it was good and couldn't find anything. Anyone else experienced this with this kind of setup? It's driving me nuts!!