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Now I read that also when the thread was new , by all means put Transynd Allison synthetic in the truck. It is better im sure but I got quotes of $48.00 (cheapest) a quart for it. Go to Allisons web site , download the manual for the 1545 and read the list maybe 4-8 approved fluids for it , 15W...

If you download the Manual for the tranny from Allison , 15W-40 is a approved fluid to use in the tranny and will cause no harm. -Jay P.S. Dont go flush and replace with Allison Transynd in your tranny unless you want to pay probably what you paid for your truck. P.P.S , "the air filter in...