You may get differing opinions on what to use, but any automatic trans fluid should work--synthetic would seem overkill to me, since there won't be any temp problems. But it won't hurt, either.
Some have found it beneficial to add 'fork oil' from the motorcycle world as a 'stiction' reducer--supposed to help??
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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