I have to deal with single-weight oils all the time with marine diesels, so I get that...and I understand your reasoning; I was more lamenting the fact that one more Jimmy's going off the roadI (with the expertise of typ4) tried but the cost of rebuilding this 2-stroke is right on par with a repower...and us 2-stroke guys have to run single weight rated oils (which are not so common anymore).
I'd turbo the 2-stroke but that adds $ fast as I'd also need to swap out the injectors too. The efficiency of the 2-stroke is still pretty bad so then I'm trying to blow even more KBTU's through the less than ideal radiator system. It's a loosing battle.
I'm not expecting to blow over the grades at the speed limit but some of our climbs have us in the single digits MPH and that's getting unreasonably slow. The hope is to upgrade (a little) and spring some life into this old beast so we can keep using it. If there was any way to stuff a 6+ speed gearbox in there I would have already done it and kept the jimmy. There isn't anyone else I've found running slushboxes tied to the 6-71 as their RV and now I think I know why
That VC is a tall steel to house the extra hardware for the jaccobs brakes.
And, here's a summary of my opinion of slushboxes in general and Allisons in particular...
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