M936A2 wrecker 90psi CTIS tire pressure modification

[Suprman]

I don't know about other wrecker owners but I can't lift heavy weight without putting the side legs down to brace. Otherwise the rear tires give and the back of the truck comes down. There has been discussion previously about the wrecker having a higher highway pressure setting. I found all the info. The wrecker uses a different pressure sensor in the cab valve body along with the newer gen ctis controller to achieve the higher pressure. I believe it also uses the newer style ctis valves, same as the LMTVs use. This pressure transducer and ecu upgrade should work for any m939a2 truck that the owner would like higher tire pressure for heavy loads.

 

[therooster2001]

At least for the non wreckers, just the ECU is needed. The others run 70 PSI with the upgraded ECU. Works flawlessly on my M925a2.

 

[Suprman]

A lot of the wrecker owners have discussed in the past trying to figure out if some special ecu does the 90psi.

 

[M35A2-AZ]

I understand your pain. When we pickup my M936 with the 11x20's we could only get 65psi in the tires and on the way home I hit a bad spot in the road with a lot of ruts in it. It was not fun driving it for about 4 sec. The truck started rocking back and forth. Now I run 90psi all round.

 

[Jbulach]

I would love higher pressures!!!

 

[Monkeyboyarmy]

Now where do we find that pressure transducer at a reasonable price? I contacted the oem for replacements for the early style and they wanted about $500 ea.

 

[Suprman]

I have a good quantity of them coming in 2 weeks or so at a very reasonable price. Knock off a zero.

 

[Jbulach]

Any chance you'll have the rest of the components as well?


M925A2 with dump hoist

 

[Suprman]

I think I have the wheel valves in limited quantity. The original ones may still work though. The controllers are not hard to find. I have the correct part number listed above in a pic. The transducer pressure sensors were the hard part. I kind of figured all this out backwards after researching the sensors.

 

[Monkeyboyarmy]

I was hoping that someone got them.