Transfer Case

[FordTruckGuy96]

I am building a truck and am trying to figure out what transfer case I should go with for the build. I have an 8v92TA Detroit backed up by an Allison HT740 transmission. For the wheels I have 16r20 Michelin XL's and 5 ton Rockwells for the axles. Initially I was going to use a 2.5 ton transfer case for the build but now am thinking that a 5 ton transfer case might be better due to the hp of the engine. Someone had mention to use a transfer case out of a M1075. Looking for any help I can get before I contact my parts guy to pick a transfer case up. Thanks in advance, and if this needs to be moved to a different forum please let me know.

 

[simp5782]

Oshkosh 55000 Is going to be the strongest.

The m1075 PLS Oshkosh 55000 cases are much bigger than the base model 55000s. The PLS cases have a front output power divider and a double lube pump on the rear


I have a basic model 55000 case in the crate for sale.

The T138 and T1138s won't handle the power from the 8v92.

The HEMTTs, HETs use the same drive train. m916A1-3s use the same transmission and Oshkosh 55000 case with a Detroit 60 series engine

It will really depend on how fast you want to go.

T1138 gives the most OD and .76/73 I believe
55000 is a .98
Oshkosh 30000 AWD case is a no go with 1.36 single speed.

 

[FordTruckGuy96]

It is somewhat of an old school monster truck build, so I don't see it ever needing highway speeds, but most roads around me are 55mph though I would not be driving that in 4x4. From my understanding the T138 and T1138 are tcases from a 5 ton, and they won't handle the output of the 8v92. I will need a more robust tcase. So the 2.5 ton tcase is completely out of the question.