hey guys. i got another newbie question for you guys, i was wondering what type of transmission I have in my cougar. It is a '68 XR7 and it is a three speed automatic. Is my tranny a C-4 or what? thanks for any info you guys can tell me
All non-overdrive Ford automatic transmissions are three speeds. There was a slightly modified C-4 back in the early 80s that had a lock-up torque converter that improved gas mileage somewhat. That trans is called the 'C-5'.
If you want a 'four-speed' automatic trans, you're looking at one of the overdrive transmissions. The easiest swap is for the non-computer controlled AOD. It is the mmost common overdrive trans behind V-8 cars from 1980-1991.
Most of the other later RWD overdrive trannies need computer control. Then you're talking the AOD-E and the E4OD.
The AOD-E is found behind V-8s from 1991 to ???. The AOD-E more closely resembles the regular AOD. Its just computer controlled instead of throttle position cable controlled. Both the AOD and the AOD-E achieve lockup simultaneous with Third gear operation.
Both the AOD and AOD-E are light duty to medium duty transmissions. The heavy duty truck and van overdrive transmission is the E4OD.
The E4OD is an overdrive C-6. Most of the 'front half' internals are the same as a C-6. The E4OD differs from the other overdrive trannies in that the torque converter lockup is independant from shifting or gear shifting. These trannies are behemoths. Whereas I used to bench press the three speed automatic trannies, (C3, C4, FMX and C-6) into place, there is no way in help that I can lift one of these E4ODs off the ground!
Anyway, sorry I got so long winded here. There are other board members who can guide you through a AOD swap. They have done them. I haven't. I am thinking about it though, just so I can run a steeper, quick accelerating rear gear and with the help of the overdrive, still maintain a modicum of gas mileage!