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No, that's not your problem. We're guessing the problem is between the engine and the wheels. And that's a guess. Isn't the drive shaft between the engine and the wheels ?
When you say the truck is jerking, are you driving straight ahead or turning (I assume it's straight ahead)? (Answer) Straight ahead except for when they put to much grease in the drive shaft and it was jerking as I was turning slightly in the parking lot making circles till the jerking went away . The jerking stopped while I was making a circle after about a 1/2 mile .
Does the truck feel like it's driving over railroad ties (moving up and down) or does it feel as though it's lunging forward, pausing, and lunging forward again? ( Answer ) Like driving over railroad ties really fast that are 2 inched apart and 1 inch off the ground . No moving up and down , just a vibration feeling . It feels like a really bad warped brake disc and you put on your breaks as your going down a steep hill going really fast . Like anti lock brakes on steroids .
Just to confirm your description of the problem, there is no noise associated with the problem, just a feeling the truck isn't moving smoothly? Yes I can hear a noise . It sounds like a hammer hitting a piece of wood really fast .
When the engine is running, but the truck is stopped (for instance, in your driveway), what lights do you see on the dash when you shift from H to L? You should see orange ABS and DIFF LOCK lights on the left side of the instrument panel, below the tachometer. You should shift the transmission into N before you do this. You can do it in P, but you will also get a red A/T P light on the right side of the instrument panel, below the speedometer, if you do. (Answer) Yes it lit up just like you said both going from N and from P with the ATP. I tried it in low and high at the bottom of the hill and pointing up hill I punched it pretty good both in Low and High and couldn't get it to make the noise or jerking action . In low gear when I punched it the engine did raise up the rpm until it sounded like it went into another gear like 2nd gear once I got going faster and once it shifted gears the rpm dropped back down . I do have the knob on the dash on the left side that has front and rear locking diff . I can't ever remember trying using this knob because I don't know when to use it and when not to use it . I would like to know more about that knob and maybe try it out . I can get on grass in my yard and drive around or I'm not to far from a gravel road . I know I'm not supposed to put it in 4x4 low or any of the other 4x4 setting on blacktop but that's about it . Could you walk me through the front and rear diff settings on that knob ? Is there a good video showing how and when you should use them ? I have a 1,000 mile loop of off road trails called the Kentucky Adventure tour that is in my back door that I'm going to take my motocycle on but also wanted to do the 4x4 trails they have mapped out on the tour as well so I need to get busy learning what gears to use .