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I agree, most everything on mine seems to match up to the A1 version.

I agree, I wouldn't go to the trouble unless they start breaking regularly. No more than I drive it, good belts should last a long, long time.

I'm leaning to the idea that these "R1" rebuilds only got what they needed. Most were upgraded to the "heavy variant" and the 6.5L motor. The rest of the rebuild was dependent on condition of the unit most likely or maybe what they had on hand. If the transmission was in good shape or they...

My 6.5L also has the multiple belts with no serpentine option.

Not sure if true, but from my research you risk oil leaks by using synthetic oil in the HMMWV. As for the blow back, these units have often been sitting for years. Once they run a bit and the piston rings reseat, any blowback might clear up or at least improve. I would run it some before being...

I have a M1097R1 and it has a 6.5L with the 3 speed.

Correct. If the bolt is on right, it’s a 6.5 and if on left a 6.2.

First off, you do want to use ATF on the power steering, as that is the preferred fluid. I just rebuilt my power steering box with a kit I bought from one of the well known military suppliers. The kit was junk! The input shat seals were the wrong size and the pitman arm shatf seals failed...

I have the 6.5L. All my paperwork on it says 6.5L as well. I believe all of the R1 were upgraded to the 6.5 when they upgraded them to the heavy variant. The 6.2 motor wasn’t robust enough for the heavy trucks.

I had another thought on this that might help, but not sure. It might be worth looking into it. Is it possible that some of these boxes have different diameter Pitman shafts? If so, maybe the Pitman arm you have is too small? If you have any calipers, I would measure the inside of your old...

With a rebuilt gear box, mine now drives great with no slack at all in the steering. Very responsive now and easy to steer and drive. It’s amazing how difficult it is to steer these things without power steering. With the right tools and know how, it’s not that difficult really. I got my...

This is just a guess, but if the transmission and transfer case were low mileage and in good shape, they probably didn’t change them out. I know there is no way to know for sure about mileage, but my unit has less than 3000 miles and the motor reflects that too I think.

More fun links on the racap program. HMMWV Recapitalization (globalsecurity.org) Joint Light Tactical Vehicle Funds Redirected By Army To Buy New Humvees (thedrive.com)

Looks great! Thanks for the extra pictures. For anyone interested, I found this link on the R1 designation, although I know my recap did not include the 4-speed transmission. Wondering why many weren't upgraded to the 4-speed transmission now? U.S. Army Weapon Systems Handbook 2012 (fas.org)

My serial number is in the 600000 range as well and I also have the 3 speed transmission. My serial number is 602733, and I never seem to find anything talking about the 1097R1 with serial numbers in the 600s. Nice job on your refurb, hope mine looks that good in the near future. Just curious...

Yep, mine has three large belts to the generator and one smaller belt that runs only the power steering I believe. I assumed maybe they used three belts so if one broke, you would have backups and enough to keep it generating power, but that might not be the case at all, so I could be wrong on that.

After cleaning up the inside of my 1097R1, I finally found a plate that shows the correct manuals, and it does appear that I should be treating mine as an A1. It seems someone tore the plate off somehow during use, and it was in the floor under a lot of junk and trash. It looks like my unit sat...

I would be interested in hearing how to do this as well. Thanks!

If you look at the shaft coming out of the gear box, notice there are notches as well as the splines. Make sure you line up those notches with the notches on your pitman arm and if you get them right, the pitman arm should slide on rather easily due to the fact the shaft is tapered. If you have...