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I'm honestly not really sure where old school Mercon falls on the weight chart. Redline MTL isn't particularly heavy...

FS as in the FS40/50? This is the first I'm hearing of the stuff. Not finding much in the way of user reviews. I suppose the FS40 would be comparable weight to the Mercon? Price isn't really a concern, I just want the best feeling shifts and most protection. I have heard a bit about hytrans...

I feel like here and now in 2024 there must better a better option(s) than Mercon for a heavy duty truck manual transmission, right? I feel as though IF (reasonably) safe to step up to a 90 weight the Ford XT-MT-QS fluid would be the ticket. I've personally experienced the wonders of "Unicorn...