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"won't start" isn't much of a description of what's going on. You will receive better help if you do a couple of things 1) start your own thread. Every thread on here is supposed to be related to a single thing. Jumping into a thread about someone else's truck with a problem not related to...

There shouldn't be. For all intents and purposes, the M1097R1 series trucks are all standard HMMWVs of other variants that got upgraded for extra weight capacity. There really isn't anything special about them whatsoever, other than not following the standard serial numbers of the regular series.

It probably wasn't that the 6.2 wasn't robust enough, but that they had already phased out the 6.2 and everything was getting the 6.5 as a replacement.

Reading through, it looks like there were multiple levels of reset, and starting with different models of truck to turn them into heavy variants. Could just be the first sets were only brought up to being heavy variant, then they did another run and brought them up to heavy A2 version, then the...

So I was looking back over some other pages, and saw where the serial numbers for M1097R1 are broken down to what transmission they have. Your serial number is outside of the ranges listed on that page, so you will need to verify if it is actually a 4 speed or if it's a 3 speed transmission. If...

So the M1097 trucks (all of them) will be in the first series of HMMWV manuals. M1097A2 is the same as an M998A2 except it is considered the "heavy" variant. Here are all the HMMWV manuals for the M998 through M998A2 (the first 3 generations of HMMWV, which is everything that does NOT have...

Then I believe that is a 4 speed truck. Should be pretty much the same as the M1097A2 for repairs and parts unless they did something really different (and I haven't heard anyone who bought one of these say anything like that)

Depends on the serial number, but if it is a 3 speed transmission for the most part you treat it like the M1097A1, and if it's a 4 speed you'll treat it like the M1097A2 when looking for parts. The M1097R1 trucks were rebuilt with a serial number that doesn't match the regular line of trucks...