am i correct in saying the xxx4 is a single belt car?? i remember on the old pb single belt cars if you tried to use reverse the belt slipped due to the position of the belt tensioner being designed to work properly for power transmitted in the forward direction only. if its slipping going forward at all, tighten the belt a little, only a fraction at a time though. you will just have to put up with belt slipping in reverse, no race cars are designed for reverse as its not normally permitted at race meetings
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