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Very useful info, thanks!

Yes sir, that assembly has been replaced with a brand new one. I just did not know the fan engaged when the air supply was cut off and vice versa. Makes sense to do it that way. Thanks!

Question has been answered elsewhere. Air off, fan engages, air on, fan disengages.

The fan on my truck engages automatically when first starting for about 15-20 seconds, then disengages. With the air system pressurized, engine off, key on, when engaging the clutch manually, the fan physically moves in towards the engine. However, when sending air manually with the engine...

I would also check all 8 planetaries.

Is there a device that controls (latches / unlatches) the solenoids when sequentially locking or unlocking of the axles each time the switch is pressed? Also, there are four solenoids. I know three of them control the individual lockers on each axle, but what does the fourth one do?

Discovered the hose going to the center locker has a big hole in it. Will replace it and see if the axle will lock. having said that, what is the best way to determine if the axle is locking without chaining the truck to a giant tree or something?

Ok, next question, what is this?

The bed isn't the issue. The side bodies and tailgate are dung.

If it's what's on the MTVR, you don't want it. IMO, it's flimsy junk.

What about a cc for the C12?

Thanks Eli!

Welcome from Perry Florida!

Welcome from North Florida! Where Floridians are still sane.

I didn't have time to mess with them this weekend. I think the first order of business will be to determine if the solenoids are operating and sending air to the locker mechanisms. Once I determine that, I'll go from there. If they are getting air, the old MM oil trick will be applied.

They look great!

Watch for limbs…

I'll monkey with them. Hopefully I can get them working.

Only one axle indicator would light up before I learned to change the CTIS setting. I'll get my son to help me tomorrow and get under the truck and listen to see if I can hear them engage (or not) while he changes the setting.

Re-plumbed it per your photo, ran air line to horn, wired it up, horn works now, no more air leak. Thank you for the help!