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Attached Stock case angle in green with shaft installed. 55000 case with no shaft installed. Video is the shaft from the CAT to the 55000. Remember the cat is higher on the frame than the stock Allison since it is an SAE1 unit.

I used the shaft for a 931 transfer case to front tandem. It is 36in if I remember right. That was the shortest you could really go without having slip problems with the axle articulation. Plus I had an easy access to em.

55000 is a .98 high 2.66 low compared to the t1138 is 1.72 low. The 939 would only go .5mph in low reverse With the 55000 so it's useless. The 30000 series case even with a .73 OD, which is standard in a 13spd transmission, on 1600s it would still be at 55mph at 2200rpms. A transmission With a...

On an A2 truck you won't have to move your transfer case back. In its stock spot it will clear the bed. A2 Trucks motor/transmission overall length is about a foot shorter than that of an A1 truck. The A1 Trucks have a doghouse in the cab to compensate for the bigger engine, the A2s do not. You...

You can not run the Oshkosh 30000 in a 939. Unless you just wanted to go everywhere under 40mph It is an underdrive unit.

You are really over thinking this. Way too much. Truck frame rails are generally all 34in. 939 parts are off the shelf civilian available vs MTVR doesn't have anything other than parts at the cat house and u joints/seals. So factor that in to when you gotta replace something on either truck...