Not sure where I should've put this thread, so I put it here. When I was out wheeling sunday and today, I noticed a few times that when I shifted into 4 wheel drive and when I stepped on the gas, a loud clicking would come from underneath the truck. I noticed it happened more when I put strain on the truck, and I didn't feel it slipping at all so I'm thinking it may be a U-joint. But it only happens when I'm in 4wd, never in 2. So it's either a front U joint or something in the t case.... Any ideas?