I have a stock 97 Yukon. Owned it for about 4 or 5 years now. Never heard of any issues with the torsion bars, but the factory diffs can be a weak point. I've read plenty about people blowing the G80 factory gov-lockers while trying to rock crawl, and there are no locker options for the factory front diff. The front diff is in a cast aluminum pumpkin, and the general consensus I've read is that they can get cracked if overworked (again, like rock crawling). The front CV joints are made for that abuse either. Seems that people who want to take these trucks into the really rough stuff put a heavier duty axle in the rear, do a SAS to the front with a Ford axle, and put 1 ton leafs all around.
Stay within their capabilities and they are really nice trucks. Generally very reliable and great tow vehicles. If I do anything to my Yukon it will probably only be a 2" inch of so leveling kit in the front and replace the stock rear leafs with Suburban springs. Maybe a round of Bilstein B6 HD's as well.
Stay within their capabilities and they are really nice trucks. Generally very reliable and great tow vehicles. If I do anything to my Yukon it will probably only be a 2" inch of so leveling kit in the front and replace the stock rear leafs with Suburban springs. Maybe a round of Bilstein B6 HD's as well.