No cooling fan was installed, and the thermostat housing casting lacked the threaded hole required for the fan sensor
Second and third gears were changed at engine 73059, frame 66220 (reference Service Bulletin GT-29) with one tooth being removed from the 2nd and 3rd drive and driven gears
A change was made to the fuel petcock to include a v-ring seal (44353-33154) to better prevent fuel leakage (service bulletin GT-37) - from frame 67962 onwards
The 1976 model used the same shouldered mounting screws for the plastic radiator grill as was used in 1975