Duty Solenoid C?

[AyeJaye]

Is there a how-to document on replacing the duty solenoid C? We just got dumped on here and I've found out the hard way that my car is next to worthless in the snow. I know my tires might be partially to blame (Potenza RE750's with more than enough tread on them), but it feels to me like I'm getting absolutely NO push from the rear end. I've driven AWD cars in the snow for years, and this feels absolutely nothing like what I'm used to.

[edit]Just went out and moved it from in front of the house into the driveway, which required quite a lot of finesse and patience. I think the rear wheels are gripping part of the time, but it still doesn't feel like it should. I'm leaning more towards the tires at this point...