Quote:
Originally Posted by strat61caster
I have Redline MT90 75w-90 GL4 right now, about 8k miles and I can't point to a difference between it and Motul Gear 300 or the OE fill (both for 30k miles). I'd bet even with the GL5 (which iirc is acceptable per the users manual, please check it yourself though) there shouldn't be an issue if it has enough fluid in the trans.
There may be an issue with the clutch install causing the bad shifting, even great shops make mistakes, talk to them, have them drive it, discuss a fluid change and if that doesn't work have them check their work and inspect the clutch install, there should be minimal or no cost to you, specialty shops live and die by their reputation. Best of luck to you.
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GL5 is NOT acceptable by virtue of the criteria which make GL3 and 4 different from GL5. GL5 contains corrosive additives which make it incompatible with soft yellow metals like copper, brass, etc. These additives are what allow it to achieve the GL5 pressure rating for hypoid gears (which a conventional transmission like ours do not contain). Some manufacturers put additional buffers in to prevent corrosion of these metals, which works by coating the yellow metals. However in the case of syncros, their very action removes this coating in a flaking manner any time they are engaged, and thus not only re-exposes them to the corrosive components, but also you end up losing a small amount of the substrate material as the coating flakes off. You will shorten the life of these soft metals by using GL5. By how much, is difficult to know.
There are several quality GL4 transmission oils to choose from, not including Toyota's own 75W LV oil. Why someone would insist on using the wrong stuff is beyond me, but hey - it's a free country.