just did mine yesterday. first disconnect sensor from inside cab towards top of DD. there should be a little metal piece somewhat hiding it. jack up back of sled as high as u possibly can. sensor is located at bottom of DD in tunnel. There is a black screw type piece that u need to pull out. doesnt unscrew just pull. sensor should then slide off of case. feed sensor through hole in tunnel and take out from inside cab. hope that helps.
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