On the passenger side at the front edge of the maincase there is a small metal tag with a heh or rug number.
Rug s transmission.
The toploader has been designated as a model t 170 or an heh or rug transmission based on the designations ford gave to it through its years of production.
The lower number on the tag is the serial number of the transmission in the order it was tagged it has nothing to do with the serial number of the vehicle the transmission is in.
These code numbers can be found on a tag riveted to the passenger side of the transmission case just behind the bellhousing mounting surface.
The transmissions were stamped on the front right corner of the main case with the last 6 digits of the vin found on the car.
68 and later units were coded rug.
Other manual transmission links.
Rug rts srod t176 t177 transmission 1 2 synchro assembly with rings springs keys fits ford jeep 79 87 1at170 80b.
Tremec 3 speed parts list tremec 4 speed parts list click below images to enlarge.
Aftermarket toploaders are still used by many circle track racers including nascar.
This is a list of tag numbers that decode the transmission.
Transmission model srod series includes the rug iron case srod aluminum case heh rug 4 speed and iron case rug 3 speed o d rts and t176 units are shown in the following illustration.
However a more significant point may be that the rug s transmission code5 was installed on the first 50 135 vin cj mustangs.
Earlier 1964 67 toploader units were designated by an heh transmission code.