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Transfer Box & Air Shift x Sprag Operation
The sprag works kinda like a "Chinese finger puzzle": The harder you pull, the tighter it gets. And yes, it slips when there is no need for it, as when the rears and front are at the same speed. Remember, there are two sets of them in there, one for forward motion, the other for reverse. The...- G744
- Post #8
- Forum: 5-ton and up
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Transfer Box & Air Shift x Sprag Operation
Good questions, possible I can relate some good answers. The sprag system will allow up to a bit over 5% rotational slip before it locks in the front axle. 6% is the target for action. It really doesn't care what you are doing as far as driving goes, all it looks for is the loss of rear...- G744
- Post #6
- Forum: 5-ton and up
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Transfer Box & Air Shift x Sprag Operation
Yep, that transfer is really similar to those in the G744-series trucks. Where you are confused, is air is used to pick the sprag rotation direction via a valve on the transmission. It decides which direction you are going, forward or reverse. The front axle is designed to 'come online' when...- G744
- Post #3
- Forum: 5-ton and up