Hey guys, I'm new to this so bare with me. I've got a 2010 F150 FX4 with a 4" Rancho Lift and 35" Nitto Trail grappler MTs on the factory 20" rims. The problem is, when I shift it into 4WD High, and turn either hard left or hard right, and attempt to turn at idle speed, the INSIDE REAR tire locks up and starts to skid. It does this when the Locker is both engaged AND not engaged. I can gas it and it'll go, but it feel like there's some resistance, and the tire still skids. Also, in 4WD Low, the tranny revs really high, and then jumps into gear for each gear. I am too scared to try this on the highway in fear that I'll break something. Otherwise, in 2WD, the truck is fine. It sometimes feels like theres resistance in 2WD, but i think its the tire size and treads. Anyone know whats going on? Is it the IWEs or the solenoid or am I just stupid? I almost just hope I'm stupid so I dont hafta repair anything.

 

Seems like the 4wd is doing its job. The reason why you're getting some skidding is probably due to levels of traction on each axle and the fact that 4wd binds the front and rear axle together (This is different from AWD which lets the front and rear axles slip from each other). So you're going to have resistance when making turns in 4wd, especially in a hard lock. 4wd on trucks are meant to be used in conditions where the surface is slippering or loose. Try doing the same on some sand or a loose surface. Truck should drive just fine, The locker will make your problems worse as well, it's really only meant to be used if moving on sand or possibly snow, or even climbing over an obstacle and the open differential is allowing for too much slip. It all depends
on your situation. Your truck should not skid at all when you're driving straight in 4wd under any circumstance. 4Lo sounds like it's working right as well, it reduces the gearing so your engine has to rev higher to achieve the same speeds in 4Hi. 4Hi is meant to be used when you're in slippery conditions and you literally just want to crawl up or down or around whatever obstacle you're navigating. It's ok to go into 4wd Hi on the dry as long as you're just going straight, it helps to keep the seals and gears lubed up. But if you're going to make any turns, you best stay in 2wd.

Hope this helps.

 

sounds normal to me, the more aggresive tires probably agravate the normal vices of four wheel drive, I wouldnt worry about it. If you have the owners manual, I believe it basicly says too expect what you are experiencing with the binding and screeching tires in tighter confines of a parking lot.