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Yea there's a bunch of info in that build thread on the m816 and I'm nowhere near done haha. No clue on the generators. Find out what the power requirements are for the battery charger you plan to use and (if that's the biggest load it will have) size the generator to it.

https://www.steelsoldiers.com/showthread.php?132200-quot-Rescued-quot-M816-Wrecker/page36 Kinda starts at post 353 with the install. Covered all the hub work/plumbing. Figure on about 1k dollars with the plumbing/fitting/valves. I simplified the air brake valves to run the minimum necessary...

For brake upgrade theres 3 options that I debated: 1. Dual circuit conversion and add pinion brakes to the rear axles for a strong parking brake. 5 tons don't have the space constraint difficulty that the m35's do for this. 2. S cam conversion like M1 did. 3. Install m939 series airbrakes...

Correction .57 OD ratio between the T1138 and spicer 6453. Couple people on here running that setup already with great results on 11x20 tires, Opcom was the first that I know of. Figuring 42" tall tires that's 1900rpm at 65mph so right above the sweet spot with those tires. 53"s would be lugging...

Which 5 speed manual are you calling normal simp? The 5 speed direct drive that only came in the m39 and m39a2 series, or the 5 speed overdrive 6453 that came in everything else? 6453 has a .78 5th gear. Combined with the .73 of the T1138 it's about a .56 OD ratio, faster than the setup in your...

About 1540rpm at 60mph with that setup. https://www.ringpinion.com/calculators/Calc_RPM.aspx Not worth the cost to swap to an auto trans. Could sell the truck and go to a m939 series for cheaper than that. She can learn to drive a stick to. Friend of mine got a crash course one night being the...

According to others experience on the T1138 into a m809 series it will put you at about 1800rpm at 60mph if still on the 11x20"s. Not quite a direct bolt in but not a complex swap.