My wife is hopefully putting her 55 1st together this winter and is going to replace the stock three speed with a 55 three speed Borg-warner with OD that I picked up at a garage sale for $20. In front of it she will have a 55 Corvette engine with dual tattersfield and Fenton headers. I have the engine down pretty pat for her but she will need some real input when it comes to that tranny and overdrive, So Joe don't you plan on no extended vacations-LOL.
I found a site with a lot of infomation on that tranny and
O/D setup-
Borg-Warner O/D It has a lot of other great information also.