Help identify this transfer case

[jflanderson60s]

Hey i got this 2 1/2 ton t-case in my mud truck trying to find some more info on it. Like what it is the low&high ratio done a lot of searching and can't find anything hope some one here can help me out ? Not sure what #'s to look at on the case so here's all i could find.

Frt. nose cone-4875-x-284 with a tag of 6-1 by the first numbers

Main case drv. side frt.-3876-w-179 same pass upper 17 1/4

Main case drv. side rear-3875-w-283 W.O. DIV. below first numbers small tag near this is 9-19-52

Hope this makes sense need to know if this case is worth keeping in the truck or do i need to swap it out any info on it would help out greatly thanks Josh

 

[BFR]

looks like a sprag case to me. If the truck's 4wd works I would imagine it involved welding the sprags( there are two, one for forward and one for reverse) roughly 2:1 low range.

 

[jflanderson60s]

Thanks! The 4x4 works all 4 tires rotate. The sprag is not welded me and my cousin pulled it out of the 6x6 just don't remember what it was. Trying to rule out some stuff with the truck looking like the 60's might be it and motor not quite tunned completely.

 

[Recovry4x4]

BFR is right, its a sprag case. T-136-21. If the 4x4 works going forward, it won't in reverse unless someone has been welding on it. The front drive ratio is slightly lower and when the rear spins, the over running clutch locks up. it spring loads to this position. Backing would require that shaft above the front driveshaft to be pushed in to switch the sprags.

 

[jflanderson60s]

Ok so thanks so much guys dose that mean the shaft above the frt driveshaft is for forward & reverse not sure i like that. I know it went in reverse real good out at my buddy and mines pit hole was deep enough by the end of the night we high centered the front end alls good though thanks again.