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It does not.

I like that mod because it gives you high and low 6x4 and high and low 6x6. While it removes some of the bind on the t-case in low range by not forcing low to always be in 6wd , it doesn't resolve it completely and low range reverse still runs a risk of breaking the t case.

They're air shift. The ratios aren't the same. It really isn't worth mating up the Tcase out of the M939series with the transmission out of the M809series as you end up with a gear or two that aren't useful. I'm thinking the M39 series is the same as the M809series except for the engine...

The 939series 5ton trucks have a 10:1 reverse gear. In low range, this is enough torque to break the transfer cases. Thus you can't back up in low range reverse in those trucks. Not an issue in the older trucks.

Another 818 with 53" tires. The truck tractor wheelbase makes a big difference.