Driving my 2005 1500HD Silverado 6.0L crew cab on the highway at 110km/hr. Truck started slowing down but RPM's going up. Pulled over to side. Tranny fluid at correct level and good color, drive shaft still there. no visible damage underneath or fluid leaking. Got back in truck put it in neutral, switched to 4hi then back to 2hi and my truck was good to go. This wasn't the first time this has happened.
Can anyone let me know if this is a transfer case, tranny or even just a u-joint problem.