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I can attest for simp's knowledge. He took a stock m923 swapped the trans cause it failed to a 7155 cat trans then needed more power after driving thousands of miles and swapped the engine. Needed lighter bed sides and more fuel so put 2 hemtt fuel tanks on it and a mtvr bed on it. Upgraded the...

@wheelspinner may have a tan cover he would trade

Nope that is definitely an 8.3. Same exact as in my m932a2.

Basically.

That truck has a 16speed air shift transmission

Personally from what I have heard is run 16.00s on a m920a0e1 (m920 but had a 7 speed automatic Alison). Easy to drive and lots of power and payload.

@simp5782 may have a few for sale. The m915 is the 6x4 version of the m916 sits taller and has 6x6. The m920 is a longer version of the m916 with a drop axle. There are may diferebt types of each truck available such as a1 a0 a2 a3 a4r2 ext. A dealer will be much more expensive than an individual.

Can you point me in the direction for a more in detail forum on how to change settings on a m939a2 ctis unit?

I personally wouldn't if you don't need to. Seems like a lot of hassle and tire wear for minimal results.

No CTIS. If you really need CTIS then you are definitely taking that truck in the wrong spots. It is a 6x6 truck with a drop axle but I believe he was saying was to add another drive axle. They are fairly simple and bulletproof from what Ive read and experienced with my m915. Simp had some...

I agree with simp. A m920 probably won’t have as good offroad capabilities but wayyyy easier to just buy a m920 with a 7 speed and a big cam 400.

An a2 truck will be different than an a1 truck because an a1 truck has a doghouse.

@simp5782 Would be your expert. He swapped a 400 bic cam into his m923a1. From what I've read you need to raise the cab and hood 2 or more inches and swap the transmission and most likely the transfer case. (Transmission is weak and transfercase will crack with the torque. Oshkosh 55000 transfer...

Be my guest. Open the trails up a little bit.

Well he was the line leader. Windrock just isn’t designed for a 8.5ft wide truck.

Are you sure about that?

Thanks! I don’t want to pay for new ctis components when I go through a mud hole or skid against a rock and get mud in my hub and have to rebuild my front hubs all the time.

@simp5782

Got it working!

(axles under your work truck are valuable) Wes: Just cut off the back half of the truck we'll figure it out later.