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Re: RE: 816 wrecker gearbox air valves sprag is a one way clutch. in this case it's shifted by air such that it locks in the front and rear together. it's supposed to detect a differential speed between the front and rear and when theres a differance it locks them together thus giving you...

the deuce system is totally different. when the deuce locks in it does it via the transfer case with a air shift valve. it does not use a sprag like the 5T trucks do.

it you get the clank in both directions it sounds good to me. thats what mine does. there is a MWO to put a deuce airshift valve on the 5T but I dont have a copy of it and dont know how the mod is done. wish I have it bc I'd like to do this to my 5T.