Hey, I'm new here and need some help figuring out what's up with my truck. I have a 95 Ram 1500 4X4 with 5 speed manual tranny. I have a 5 inch suspension lift, 3 inch body lift, 38 inch tires, and 4.56 Genuine gears with about 500 miles on them. The truck has 50K miles on it. What's happening is when I am going down the highway and let of the gas there is a mix between a grinding and whining noise. It quits when I completley let of the gas but if I hold the pedal with just slight pressure on it, it continuously makes the noise until I get back on the gas again. It is the most noticable when I'm in 5th gear and going at highway speeds. Also when I let of the gas in any gear completley there is a cluck. Here is what I have checked so far. U- joints - good, backlash in rearend since I just put in 4.56's - good, pulled tranny because that's where the noise sounds like it's coming from, went through it and everything looks fine. Could it be a pinion bearing and the noise is vibrating up the driveshaft? I don't know where to go next with this. The gears shouldn't be that noisy should they. Any input I would appreciate.