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I am not sure about whether the engine or transmission generates the most heat. Though I read here (on the forum) that A0 units had the transmission cooling loop routed in to the cooling system differently than later units. I have wondered if there is a convenient port to add a temp sensor to...

Do you have a photo of the unit number? Or can confirm only 'H' is supplying?

Sure. Wife is out of town this weekend, where shall we meet? Hondo would be good. I have a client developing a project in Natalia and visiting the site would be good for me, too—

First test drive with the ECO HUBS went fabulously. Much quieter, smoother, cooler (hovered near 200, fan did not kick on), and she cruises at 60 like she is walking diligently. When the transmission hits that next gear at 60+ she leaps forward like she wants to run. Thank you @Xengineguy...

The way Congress is going our military is going to need every spare part and truck they can hold on to—

I don't know for sure: I gleen from several sources, including @Ronmar and @GeneralDisorder, these pieces: 1— CAT 3116 lacks electronic controls and data the CAT 3126 and CAT C7 engines have; 2— units with CAT 3116 use analog pulse per mile (PPM) speed signal, while CAT3126 and CAT C7 use a...

I doubt the overspeed as @Ronmar stated, because of the lack of electronic sensors on the A0. All I am suggesting is based on @GeneralDisorder statement that many programs exist, and I read, residing in the newer ECU's; that by changing the way power and ground are applied may access other...

When I last spoke with @Plasa an Arduino prototype $320 including shipping to the US–

After replacing our battery disconnect relay, installed the new Dana ECU made for an M939A. If I am reading the M939 and M1078 schematics right our new ECU can receive power or ground on H and X, or V, F, and Z. Our M1078A1 is providing power on H and M (though M is not used on the M939), so...

Got new battery disconnect relay installed; problem solved. Thank you all for the guidance—

Good advice. I'll order the seals and add to my cab and chassis plan. Thank you—

I have been pondering this since watching @Xengineguy installation video. As it is we have gear oil/brake cleaner contamination in the rears and gear/oil/brake cleaner/grease in the fronts. What is the proper way to clean it?

Interestingly, in the 1,500 miles or so I have driven, her by the back of hand test, the front hubs have felt cooler than the rears—

After I posted this while finishing the front passenger hub up I had the same thought: someone packed the bearings. I didn't pull the bearings, though I blew through my metal cleaner stash until the bearings ran out clean. I'll drop the center Monday, refill all three and redo in 250 - 500...

Adding ECO HUBS to our M1078 this weekend is going well except the front axle gear oil is clotted. Not cloudy or milky, black as midnight, clots when cleaning out the wheel hub with metal cleaner. It was difficult to clean out the wheel housings sufficiently. Planning to drop all the gear oil...

While I await the arrival of the new battery disconnect relay I took a look at the existing one. It looks almost as old as I am. Though I realised the new one is expecting a plug, not individual wires. Anyone know which plug?

I can be really slow. Are these just fancy ATC (breakers) fuses?

I have ordered hoses from CAT for years, though I use that little tag they put on there. I looked at this site this morning and said a similar thing: How am I going to know how to order the right hose–

Water is the universal solvent—

I am so grateful you all put up with noobs like myself. ABS (I noticed there is no relay in the ABS slot at the PDP, best to address) is labeled M-43 Detector and Decontamination Ap is air-over-hydraulic. Brilliant. Thank you both, need educating—