I use Case IH Hy-Trans Ultra and love it. Lowers stall 100-200rpm, and seems to hold more torque when the TC is locked up.
I know PDD has some fluids that are supposed to be even better, but I haven't tried them yet.
I've been using it for about 5k miles on my 47re I built this spring. Seems like good stuff, it definitely got lots of abuse this summer. I also put it in my transfer case lol not sure if I should have done that but I haven't noticed any ill effects yet. Biggest thing is the cold, if you dd your truck and have a low stall converter, well you know the rest.
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How cold are you taking? What stall is your converter?
I need to drop the pan on my 48RE to change pan gasket. With the price of ATF, I'm considering a hydraulic fluid switch over to the Super S 303 also. We run 303 in all our tractors.
Good deal, im looking to lower my stall mainly, and this seems to be the easiest way to do so, I wouldn't mind going even more then that. Thanks, it just seemed that everyone ran JD, wasnt sure if it was a must for some reason.