Trucks of that era used a steel gear that matched the drive gear on the rear shaft.
Your replacement transmission is likely from a car which uses a larger plastic gear to match the
drive gear. The plastic gears are white 25 tooth, yellow 24 tooth, and green 22 tooth to match
the gear ratio of the rear end. The same speedometer "bullet" is used with both applications.
Note: There are some differences between car and truck transmissions.
The internal components are the same but there is a difference on the side cover shafts clock
position, the lower mount holes are threaded on the truck, and the speedometer gears.
Fred
