the pb 2 speed box was great, worked fantastically in a cougar used on road with foams and a sierra cossie body, was quicker than the pro10's down the straight at ashby. i still have a cougar box built up with the pb 2 speed and mip rc10 chain drive kit inside it. also fitted experimently to cat xls, pro10 car (silly....) and an optima mid. mini mustang 2 wheel drive worked really well with two speed, slowing down was only problem, you had to throw it at the corner to scrub off some speed, if you can call it speed anymore compared to the missiles we drive now!
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