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I have been using 10w motor oil in my m929. That what was in it when I got it.

Just get it rebuilt. Be cheaper. It could be the black box on the firewall on the drivers side.

Maybe they just did not want the guys shifting it. You can shift it by hand form under the truck. Just let all the air out of the truck and shift it or have someone push the button on the shiftier. Castle Bravo on here may have a linkage.

74m35a2 maybe able to help you with the 21SI alt.

OK if it is on the Passenger side I have not seen one before on the M939 trucks.

Can you post a pics of it.

Are you talking about the black box on the driver side on the fire wall? That is not a Voltage regulator.

I will be in for a set.

I have some CTIS covers for the A3 if you are interested.

They can be a bear, I clean off the paint, rust and put a little oil penetrate on them, then use my 1" impact and it still works hard. I feel your pain!

Made some Sun Visor mounts for the M923A1, used some Hmmwv visors.

Sounds like you still may have a little air leak. You could bump the idle up a little on the pump and see if that helps. Is this a NHC250 or 8.3?

I used a set on the 3000 miles I drove on the MVPA RT66 convey and I think I got better MPG.

Welcome!

This is what I did to my M923A1 and I have done it on all my trucks. The coolant filter is on the left.

Be sure to disconnect the batteries before you start. The Tack and Speedo cable are what is holding it. Also you can remove the the power and start switches and that will help.

That is good to know, I have that on my M936 also. Thanks for the info.

Is that on the under side of the truck?

Great question, I would like to know that also.

Looks like it got some water in it and set for sometime. I would replace the bearings and race. My M936 was like that when I got it, it was so bad it was starting to make some noise.