Rafael, what is your truck's serial number that's stamped on the front frame rail (should be eight digits; for example 80011151)?

From LUBRICATION ORDER LO 9-8030. AIR CLEANER – (Oil bath type). Daily, replenish to bead level with OE, crankcase grade. Every 1,000 miles, clean reservoir and refill with OE as above. Disassemble, clean all parts, refill with OE as above whenever crankcase oil is changed. For desert or extremely d...

AVM locking hubs for the Dodge M37 part number from the AVM website:
http://avm.com.br/products4.htm

Locking hubs AVM Model Number 408
AVM Service kit 4408

The main problem is the industrial / military style spark plugs are obsolete and no longer being manufactured, and becoming hard to get or very expensive. It seems that a viable commercial alternative spark plug for the 3.8 liter engine in the stock M37 is either an Autolite 295 non-resistor or Auto...

There is a series of technical manuals that cover radio installations in the M37. TM 11-2300-352-14-8 (Jul '72) - Installation of MK-1412/VRC-24 in M37 TM 11-2300-352-15-1 (Apr '66) - Installation of AN/GRC-106 in M37 TM 11-2300-352-15-2 (Sep '66) - Installation of AN/VRC-12 in M37 TM 11-2300-352-15...

SKF technical support was able to direct-cross the M37 Transfer Case companion flange seal (four used, one seal used with each transfer case companion flange) using the G741 parts book Chrysler number 927367 (SEAL, Chrysler part number CC-927367, Ordnance part number 7705744 in the M37 G741 parts bo...

The Specialty Tire of America (STA) Superlug Tube-type size 9.00-16LT tire is an 8-ply rated tube-type tire with an STA product code of LT286. STA also makes two other Superlug Tubeless size 9.00-16LT 8-ply rated bias-ply tubeless-type tires with STA product codes of LT285 & LT28M. If you’re put...

I use the conventional concentrated O'Reilly house-brand green antifreeze part No GAL Line AFZ from O'Reilly auto parts. It's listed on the front for use in 2000 and earlier Ford & Chrysler and 1995 and earlier GM and all other makes & models. It's concentrated which means you need to add wa...

I ordered a can of each from SkyGeek (Styles Logistics, Inc). https://skygeek.com/?msclkid=4472795fc3531f55dd1e1a17637c675a 1 × Skilcraft® 0674-330 ECO SURE® FS 33538 Flat Yellow A-A-2787A Type I Spec Industrial Enamel Paint - 11 oz Aerosol Can $15.27 1 × Skilcraft® 0674-111 ECO SURE® FS 11136 Gloss...

Great detective job!!! What a butcher job on the fuel filter from a previous owner; when you buy something I guess you never know what they may have done to it to cause you grief going forward. I have a 24 VDC Facet fuel pump in my truck on the frame rail just below and forward of the fuel tank (FAC...

The paint color codes in the previous post are from Federal Standard 595 COLORS USED IN GOVERNMENT PROCUREMENT. The first number in the code indicates the following: Gloss 1xxxxx SemiGloss 2xxxxx Lusterless 3xxxxx The yellow plate color scheme was retained into the four-color camouflage era of the 1...

After researching TB 43-0147 C2 COLOR, MARKING AND CAMOUFLAGE PATTERNS USED ON MILITARY EQUIPMENT of December 1975, TM 43-0139 PAINTING INSTRUCTIONS FOR ARMY MATERIEL of 27 July 1988, and MIL-S-405626D(GL) SIGN KIT, VEHICLE CLASS of 31 March 1994 I believe the older Bridge Plate (applicable to the M...

Ignition connection would be to the dash spider harness (+24 VDC hot when the ignition is on).

If you look up the MIL-STD's for those gages, the smooth connector goes to IGNITION and the ribbed connector goes to SENDER.

Bob Stahl from Veteran Vehicles has an outstanding article on 4.89 gearing for the M37.
He's a very helpful guy, sells parts (including an M37 third member with 4.89 gears installed), and knows these trucks!
Go to this site for his article.
https://www.dodgepowerwagon.com/stahl/gearing.htm