I'm not sure how much yours takes, but mine used about 7 quarts of fluid. Mobil 1 was my choice, was in there before for 100k miles and came out super clean. I renewed with the same and in another 100k mi I'll report back with results. So far this tranny has 245k mi on it with no rebuild and she still very strong.

Amsoil I believe also makes a good synthetic trans fluid.

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Stable Mates:
1987 300TD 310K mi (Hans)
2008 Jeep Grand Cherokee OM642 165k mi (Benzrokee)