A tech article from The Star (http://www.mbca.org/MBCA_parts_wear_out.htm) mentions that delays in engaging reverse may be a sign that the tranny needs an overhaul. Hopefully that's not what's required to fix it...

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Rainmaker
93 500E, 43k mi, Pics of upgrade parts
Evo II Wheels on Dunlop FM901 235/45x17s
94 Facelift
RennTech CF Airbox
RennTech ASR Defeat
RennTech Chip
1st Gear Start
97 Range Rover 4.6 HSE Vitesse, Yellow, "Tonka" (sold)