My AW-55 rebuilders manual is at my shop. I’m unlikely to see it anytime soon, but I don’t recall a thermostat in the transmission...
I’m surprised by the lack of noticeable temperature improvement. It may be that’s the best result you’ll get under modest load, where the fluid is relatively cool, and warmed by the radiator.
My hope would be, that the fluid under heavy load, when it’s quite hot, gets noticeably cooled by the cooler. Yiu would need some before and after data to confirm.
In any event, I think you’ve done a good thing for your transmission. It still runs at normal temps, but I don’t think it will hit the same highs under heavy use.
Let me also add that I’ve relaxed my position on fluid. I used to be pretty adamant about JWS-3309 and only used Mobil 3309 or Toyota T-IV. But I’ve used Valvoline Import Multi-Vehicle and AMSOIL Signature Series with good results, so, pick a fluid that’s JWS-3309 among the many available, and change it often.
https://www.amsoil.com/p/signature-s...ion-fluid-atf/
Last edited by Astro14; 08-27-2020 at 03:53 PM.
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