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[ExcursionPSD]

Driving in 4x4 with the front hubs engaged, puts a lot of stress on the drive line because of binding, the wheels want to turn at different speeds, but the transfer case keeps the front wheels turning at a consistent offset compared to the rear wheels. However, the driveline can probably deal with this better than the transmission, especially in reverse where the gear ratio on the 4R100 is actually higher than in first gear. (in soft ground, you will notice it take higher engine rpm to start moving in reverse gear than in first gear if you are on the level)

Read the posts on 2 wheel drive low, it is easy to do if you have installed manual hubs, like I have, but also simple with ESOF, you just disconnect the electrical connector to the Pulse Valve Hublock vacuum solenoid on the right fenderwell, near the vacuum pump, BEFORE you switch from 2WD into 4 x 4.

4 x 4 Low does not automatically lock the torque convertor, otherwise you would not be able to idle when out of neutral or park. The low range, means the torque convertor does not have to work nearly as hard to make enough torque to move the vehicle. If the torque convertor does not have to make as much torque, it also is not making as much HEAT!