Now with 160k on it I have done two pan drain and refills, I plan on draining just the pan and refilling every 30k because the truck see's a lot of hard driving now, towing, off road, ect. The truck has a custom tune on it and shift points and line pressure are tweaked. I have a 2000 4L60E that calls for DexIII, the first 100k on this truck was cushy driving and mostly freeway and at 100k I did a pan drop and filter change as well as flushed all fluid out and replaced with DexVI, I also added a Transgo HD2 Shift kit and billet servos and 4th gear super apply servo. If a transmission was designed with DexVI in mind, the friction properties of DexVI would probably be more suitable than those of Transynd. But I wouldn't bet that everybody else would have the same experience. My own results tell me that the friction properties of Transynd are somewhat different than those of DexVI- and said friction properties of Transynd work better in my 230,000-mile 4T65e. I've seen no reason to believe that Transynd is a "better" fluid than DexVI in any way. It would work- but you'd be taking your chances.
I dunno if we can assume that with Transynd, with the exception of GM pickups. into an application that wasn't designed for it (although one would assume that Amsoil and Valvoline have done some testing for automotive applications. IMO it would be analogous to putting a fluid like Amsoil, Maxlife, etc. it would DEFINITELY be noticed by the tech if there was a warranty issue. But for how long? And under what conditions? And would it cause warranty issues? Transynd is a weird looking ATF once it gets some miles on it- turns a strange yellow color with a reddish tint. In non-Allison applications calling for DexVI, I have no doubt that Transynd would work. Personally I doubt you'd notice any real difference between the two. The choice of OEM fluids in that particular transmission is based more on corporate politics than any distinct advantage. From what I've read, there's very little in the way of 'proof' or solid info that's readily available to us mere consumers (lots of claims, lots of anecdotal evidence. and should work fine in any application calling for that.Īs for whether Transynd or DexVI is 'better' in the Allison transmissions in those GM trucks- I dunno. Transynd is a synthetic atf that meets DexIIIG specs, along with a laundry-list of industrial specs.
Did a complete flush with Transynd and it solved the problem.
Dex iii transmission fluid full#
This particular transmission didn't shift well when I 'upgraded' to DexVI (the 1-2 up-shift started a nasty slip & grab behavior at full throttle).
I've had Transynd in my '01 Lumina's 4T65e for the past 30K or so.
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