- Joined
- May 9, 2024
- Messages
- 3
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 Tears" in a Miata. I've also recently used the Motul Gear 300 75w-90 in a Subaru manual trans and am quite happy with the improvement.
I've used both Redline MTL and MT-90 in the past on various cars as well as differing flavors of synchromesh options. While I've never been displeased using those, I did not see the staggering improvement that I did with the unicorn tears or the good improvement with the Motul. I have never personally used the D4 in either a manual or automatic, but I hear good things online from the Corvette/Tremec guys.
I get why they spec'd this truck/trans to use Mercon back in the day, 35+ years ago but that can't still be the best choice now?
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 Tears" in a Miata. I've also recently used the Motul Gear 300 75w-90 in a Subaru manual trans and am quite happy with the improvement.
I've used both Redline MTL and MT-90 in the past on various cars as well as differing flavors of synchromesh options. While I've never been displeased using those, I did not see the staggering improvement that I did with the unicorn tears or the good improvement with the Motul. I have never personally used the D4 in either a manual or automatic, but I hear good things online from the Corvette/Tremec guys.
I get why they spec'd this truck/trans to use Mercon back in the day, 35+ years ago but that can't still be the best choice now?