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I know full time can be used on dry roads. And, that turning on dry pavement with part time binds up the drivetrain. But, what is the mechanical difference between the two?
Which would be better in deep snow?
The difference is that full time has a differential in the t-case that allows the front driveshaft to operate at a different speed than the rear DS or not at all, essentually sending power to one of your four wheels in very slick conditions.
For deep snow, part time is the one to use.
I know full time can be used on dry roads. And, that turning on dry pavement with part time binds up the drivetrain. But, what is the mechanical difference between the two?
Which would be better in deep snow?
The transfer case acts a differential between the front & rear driveshafts. "Locked" TC ==> part time FWD. "Open" or "Limited Slip" TC ==> full time FWD.
"Part time" is better in snow because it at least guarantees that power gets to each axle.
The best thing about fulltime is that you can leave it in fulltime when the roads are partially snow or ice covered (patches of snow/ice). Its a good compromise between part time and 2WD