speedometer gear

[RSZ28]

Planning to install 3.55 gears in my 8 3/4 rear end, and will use 28" tires. My transmission is a 1965 BB 727 (one year only). What speedometer gear color and teeth are needed to fit this transmission? I know that a 33 tooth yellow was used on later transmission but do not fit 65. Thanks

 

[Dipstick]

Planning to install 3.55 gears in my 8 3/4 rear end, and will use 28" tires. My transmission is a 1965 BB 727 (one year only). What speedometer gear color and teeth are needed to fit this transmission? I know that a 33 tooth yellow was used on later transmission but do not fit 65. Thanks

The pre-'66 uses a speedo pinion with a tooth range of only 17-21. In your case either a 20 or 21 will work but they're hard to find.