Either a bad ujoint or cv joint in you front drive shaft. If its got any lift the driveshaft prob should have been "clearance" around the cv ears for more angle. Your hearing the front drive shaft wobble or pop. Check the ujoints and the cv nuckle and that should fix you. 
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Cruiser: 1972 K5, 400/TH350/NP205, D44 and 12Bolt, 35 TSLs.
Trail rig: 86 K5, 350 TBI, SM465/NP205, 5.13s, 14ff locked, h1 beadlocks, 42" TSLs, 64" rears, 56" fronts, D60 locked, 35pline, drive flanges, crossover, hydro assist, OBA.
Tow rig: 2002 F350 PSD CC Dually FX4, chipped, cold air intake, BFGs
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