Jeep Wrangler Rubicon Unlimited.
Its not a truck but its the best 4x4 out there as it has...
- Selectable locking front and rear differentials. This makes a HUGE difference when stuck
Figured I would wikipedia explain it because they do a much better job of it than I ever could...
Quote:
Many differentials have no way of limiting the amount of engine power that gets sent to its attached output shafts. As a result, if a tire loses traction on acceleration, either because of a low-traction situation (e.g. - driving on gravel or ice) or the engine power overcomes available traction, the tire that isn't slipping receives little or no power from the engine. In very low traction situations, this can prevent the vehicle from moving at all. To overcome this, there are several designs of differentials that can either limit the amount of slip (these are called 'limited-slip' differentials) or temporarily lock the two output shafts together to ensure that engine power reaches all driven wheels equally.
Locking differentials work by temporarily locking together a differential's output shafts, causing all wheels to turn at the same rate, providing torque in case of slippage. This is generally used for the center differential, which distributes power between the front and the rear axles. While a drivetrain that turns all wheels equally would normally fight the driver and cause handling problems, this is not a concern when wheels are slipping.
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Your ordinary 4x4 truck will get stuck in a lot of places where I'll just power on through.
Edit: By the way, if you insist on a truck, at least get one with a Rear Diff Lock (Chevy's Eaton G-80 locker really doesn't count as its really not very good and isn't selectable). Ford offers the selectable RDL as well as the Tacoma. Not sure about Dodge.