The speedometer gear installs on the speedo drive housing that gets installed into the transmission. Danchuk # 15543 is blue, has 20 teeth, and will work on any 1957 classic Chevy with an automatic transmission. Replaces GM # 3708246.
Note: Match speedometer gear color to your original.
Danchuk has the largest selection of quality 55, 56, 57 parts for your classic Chevy project.