It depends on how steep the hill is, but mine does the same thing. Maybe because they are very heavy cars. As long as the trans shifts fine and the fluid looks good it is fine. MB trannys tend to last a long time and die a very slow death.

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2006 CL500
2009 C300 4matic
1969 280SE
2023 Ram 1500
2007 Tiara 3200