Buying a 727, what to look for?
The easiest way to tell a BB from a SB trans is the BB trans only has four small 1/4" holes at the bottom to retain the dust cover. A SB cover has three 1/4" holes and two 7/16" holes holding the cover on. Print out the list I posted below (in pdf) and make sure it's a 71 or newer trans and not a lockup model. 71 and newer models used a wider 1" front drum support bushing. 70 on back used a 1/2" wide support bushing. 71 and newer also had part throttle kickdown (if you plan on using the stock valve body it's nice). If you can find a 71-73 that's the best. In 74 they went to the load control front servo which isn't as responsive. That's not as big of a deal as the wider bushing though IMO and you can always swap the servo for a early style or billet one.
BTW: you can tell a lockup model from a non lockup by the input shaft. I'll attach a pic of them. The top shaft in the picture is a lockup trans. See how it has the end of the shaft milled down smooth and a non lockup has splines all the way too the end.
The easiest way to tell a BB from a SB trans is the BB trans only has four small 1/4" holes at the bottom to retain the dust cover. A SB cover has three 1/4" holes and two 7/16" holes holding the cover on. Print out the list I posted below (in pdf) and make sure it's a 71 or newer trans and not a lockup model. 71 and newer models used a wider 1" front drum support bushing. 70 on back used a 1/2" wide support bushing. 71 and newer also had part throttle kickdown (if you plan on using the stock valve body it's nice). If you can find a 71-73 that's the best. In 74 they went to the load control front servo which isn't as responsive. That's not as big of a deal as the wider bushing though IMO and you can always swap the servo for a early style or billet one.
BTW: you can tell a lockup model from a non lockup by the input shaft. I'll attach a pic of them. The top shaft in the picture is a lockup trans. See how it has the end of the shaft milled down smooth and a non lockup has splines all the way too the end.
