Join Date: Jun 2011
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I would jack it up and check the condition of you wheel hub bearings...Also I would pop the inspection cover and see if anything is going on with your ring and pinion gear since the problem is only occurring when you are lock in 2wd or 4wd... If it is a heavy thud you could have a loose pinion or something of that sort.
~1973 F250 Highboy
~2003 F350 Super Duty XLT FX4 6.0 Powerstroke
4.56 Yukon Gears,Detroit Locker,37x13.5x17 Interco Super Swamper M16,8in Custom Lift,Bilstein 5125 Custom Valved Shocks (Triple Front/Dual Rear),Fabtech Dual Rear Shock Kit/Traction Bars,ARP Head Studs, Sinister Headers/Y Pipe/Regulated Return,175 cc Injectors,Edge Juice Platinum with Attitude,SCT Tunes,Snow Performance Stage 3 Water Methanol Injection,FASS 150/180,Banks Techni-cooler System,Fluidampr,4in Straight Pipes.