I've seen these on Ebay before and thought it would work good in my old truck. However I don't really know that much about them.
http://cgi.ebay.com/ebaymotors/WATSON-3-SPEED-BROWNIE-OVERDRIVE-TRANSMISSION-30-OVER_W0QQitemZ290326279834QQcmdZViewItemQQptZMotors_Car_Truck_Parts_Accessories?hash=item4398cb769a&_trksid=p4506.c0.m245&_trkparms=65%3A3%7C39%3A1%7C240%3A1318

Umm, they're not brown....