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the spicer in an 818 is well shorter than a Allison.

It is the same as the Oshkosh 55000 and I have the brackets to bolt it into a 5 ton.... However even on 1600R20s with your .78 5 spd transmission in the truck now you would be turning 2150rpms at 50mph. So basically as fast as you are now on the 11R20s. But you could climb a mountain with big...

T1138s are getting pricey. In the 1500 range or more. I've got a source for several 7 ton Oshkosh 30000 single speed transfer cases. It's an under drive 1.36:1 unit . if you were planning on a 9speed with a double OD. Bellhousing in the engine is an SAE 2 so most common medium truck...

T1138 is an overdrive unit. The T138 is not. You can roll backwards in a T1138 no issue. You would want it to engage the front axle with a TR1 switch. Meaning air to it its locked. The auto lock in low range is done by a modification washer attached to the shift linkage that was part of an...