Originally Posted by AkSSS

I hope you have heaters on your truck? I have dealt with very cold temps my whole life. I have never lost a differential from being to cold. You might want to check your diff fluid, try a synthetic 75/90. I didn't have a garage for years growing up in Alaska and I would go out and start my truck at -40. I never did anything to the front diffs.

I have had 2 sets of front carrier bearings in my SSS in 75k miles. I don't even drive it in the winter any more. I think the little bit of power I am putting down is hard on it? If I remember correctly, you can get a bearing kit for like 140 bucks. I have rebuilt mine by myself both times. Never had an actual failure but I got that whine up front on Decel. Cant stand it.

Originally Posted by Gadgetized

I don't think you can make the 149 into 2wd. I believe there is something with decel in a 2wd that will ruin the Viscous Coupler. There might have been a selectable transfer case in a jeep.