Hello all. This is my first post here, and I seached for the answer like crazy and couldn't find anything, so don't hurt me /forums/images/graemlins/grin.gif OK, I installed a 2" add-a-leaf to my truck(front only) and everything was great--or so I thought. The truck is a 74 chevy 3/4 ton 4x4. I took it out for it's first wheeling trip since the add-a-leaf install a few weeks ago and noticed that when the hubs where locked, it made a LOUD banging sound from under the floor. I unlocked the hubs and the sound went away. A week later while hauling my camper, I noticed sounds coming out of the front wheels--in two wheel drive. I swapped out the front wheel bearings and they were toast, so I figured that that was the problem--and it was, at least while free wheeling in 2 wheel drive. Thinking all was well with the world, I took the truck out to the mud last weekend and it made same loud whacking noise when the hubs where locked. It sounded like somebody was beating on the floor with a hammer from underneath. So I ventured underneath the beast again today and I think I found the problem: The Cardan CV on the front driveline is contacting the crossmember/support as it rotates. I couldn't believe it. To verify, I pulled the driveline and took it for a drive hubs locked and sure enough, the sound is gone. Here is a pic of the cardan where it hits the support: I should mention that the truck has always made the noise when the hubs are locked, just not as nearly as consistently or as pronounced as now. It used to only do it rarely(probably only when the front suspension maxed out, now that I know where the sound is coming from), but since it so rarely did it, and only while off roading, I was never able to nail down the cause. I'm sure that it was the lift is what is making it do it all the time, but I also know that there are TONS of trucks like mine that are lifted and do not have this problem. Has anyone ever seen this before? Shouldn't the tcase be higher or the support lower? I had noticed before I had installed the lift kit that the floor/body above the tcase had been cut out, and a new piece screwed in over the cut, in what looks like an attempt to give the tcase more headroom. Here's a pic of what I am talking about, with the area highlighted in red(fear my PS skills): So what do you all think? Where should I start? Replace the bushings in the support mounts maybe? Or is it just monkey rigged in the first place? Any help would be greatly appreciated. Thanks!