Originally Posted by jc-ski
249 it is. Guess I'll keep that single pair of cable chains in the back for show, or if things start getting serious ongoing this winter pick up a second pair.
Snowfan, if you don't mind my asking, are/were you in the auto biz? Engineer, mechanic, Jeep enthusiast, or ??
If you get into deep snow or a short patch where you need to chain up go ahead. What you should avoid with a 249 is having no wheel slippage, like on dry/wet pavement while the wheels in front or back are effectively larger/smaller in diameter, even slightly. The viscous coupling looks like this...
Marvelous contraption. HD and weighs a bunch. It is filled with fancy silicone that instantly heats up when it detects rear wheel slippage and locks the front and rear drive shafts together. By default it spins the front with 10+% and is thus AWD all the time. These wear out around 120,000-150,000 miles. When worn, they lock in 4wd and steering becomes heavy with severe tire chirping and in tight turns like in a parking lot.
Newer rigs have electronic systems but as mentioned earlier, IMO, these are fantastic in the snow and allow just the right amount of slippage to be completely unnoticeable.
Back in the late 80's and early 90's I was a car dealer in Los Angeles. Most of my business was exporting cars and parts Japan. Have always been a gearhead, redneck engineer and Jeep nut.
To summarize...you can chain up your GC but don't drive it on pavement that way. The silicone in the VC will boil out and you will be stuck in 4wd but not disabled. They are expensive $350 plus labor.