I have a 1976 F-100 with a 300 6cyl and 3 speed on the column. I was thinking about replacing the transmission with an automatic and was wondering if any of you guys knew what transmissions will bolt up to the 300. I drive this truck to work occasionally and use it to haul light loads from time to time. The 3 spd just wont let you roll on on the interstate and my wife can't drive it. Thanks for your help