This will sound stupid but I don't mean to offend... Are you doing this on pavement or a hard surface? 4wd is for loose surfaces. If the front wheels are getting too much traction (same as the rears) you will get this reaction. Otherwise you are going in the right direction by checking axle u-joints and the center axle disconnect. There is a kit out to eliminate the thermal/Vaccum disconnect. A vac leak will cause the collar to partially/ completely fail to engage. Good luck and keep us informed... Chris
'02 2500 Quad Short Box, HO Cummins, 6 speed,Fast Cooler and filter kits, Con-OFE clutch, 3:55 limited slip, Banks exhaust and Brake, K&N, Autometer Lunar series gauges, Air Dog 100gph, Adrenaline chip SOLD :-(
Current ride: 95 2500 2wd with a P-pump
90 Miata LS-1, 6 speed, 8.8 Cobra IRS
5-21-93 married, cost $15k
4-29-02 bought my Ram, cost $28k
3-15-99, 8-8-05 sons are born PRICELESS!