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Found this. Also Connecticut starts with a C and so does cold. So myself yes you could add 10 or 15/40 if you were topping off. https://www.steelsoldiers.com/showthread.php?77746-Allison-Transmission-Fluid-Research

Well when the transmission fluid is up to temps try a full peddle run up. The motor has a governor so you won't hurt that and that Allison will handle just about anything you can throw at it. I don't know what transmission is in there so I ask you is it the computer or transmission governor that...

Yep very important. Also one would think how was the machine to be used in the case of the transmission. Going down a highway at speed plenty of air flow and cooler transmission. Mud pits and mountain climbing would be low ground speed, high rpm and little air flow. Good luck with what happens.

Don't know if I believe everything on the Web but found these figures on regular transmission fluids versa miles and heat. Yea I remember that same engineer Mr.Johnson aka Mr. Transynd and I had a thread from him where he stated that at the time the C4 or the motor oils were ok by him and...