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Right for 5k you can buy a whole running 1500 - 2500 series GM truck or van with a 5.3 or 6.0. You could find a camaro or transam too with aluminum 5.7 LS1 but those are harder to find cheap

Heres a LS HMMWV 6.0 LQ9 Swap from the Hummer Network Forum on Youtube https://www.youtube.com/watch?v=L1bwjmPUntU&feature=youtu.be

I personally wouldn't change anything, the gearing is fine. It's just that if you want to actually drive the M998 like any modern fullsize truck you need another gear, or more RPM on the engine side, and an engine that can cool with electric fans. A LS would do all that for super cheap and get...

When i was looking for my M998 I was using search tempest to look all across the country and I saw no less than 5 HMMWV body swaps on to solid axle suburban chassis with 350/454 engines and another 2 kit Humvee aftermarket bodys with 350/454 and solid axles. They were all $6k or less. LS would...

specs on the 3.5 are good, used to have a mustang and a lightning. Be a good swap as well

An ecoboost swap would get good gas mileage, still under powered though. 250hp 290tq at the flywheel. So less torque than the 6.2 6.5 im sure less average tq across the power band from the 2.0 Ecoboost even with the turbo. Kits are $6k. You can get a lot of LS power for 6k. These some LSx...

Also an LS swap is so easy. 12v to the harness, carb kit, needs low profile intake and carb cleaner, high alternator mount to keep any fording ability, flexplate adapter for the old 3l80e and some routing of the hoses. Bolt in.

I think a LS would be good a good fit. It works in all the full size GM trucks just fine. Reliable cheap parts easy swap to do fuel injected or carburetored. I have a LS2 - aluminum 6.0 in my Corvette no issues. Had a Tahoe with the 5.3. It’ll do highway speeds, pull a boat, run on regular gas...