I am paraphrasing a 1994 memo “13-TR-90” from Allison.

Models AT500, MT600, HT700, V 700, MD, HD,B 300, B 400, B500 series on highway Dexron-III or C4 off highway C4.

CLT, CLBT 750, 5000, 6000, CRT3/5/6/7000, DP 8000 and CLBT 9000 series use C4 ATF.

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