In 2WD mode I have never noticed anything different from when the front was open. I have yet to be in a low traction situation in 2WD, though. Put it in 4WD on pavement and you will notice that the stearing effort increases significantly when making turns. This is much less noticable out on the trail, though I would say that the turning radius is higher now. Haven't had her in 4WD in the snow so I can't comment there.

Out on the trails I've been very pleased with the improvement. I have no real negatives to report and would certainly do it again.

1991 Montero LS, fading red paint
Front and rear limited slip differentials
95 SR Rear Springs, torsion bar crank, 137,650 miles
33x12.5 ProComp Mud Terrains, Bushwacker Fender flares
3 litre V6 with new heads