Total Bolt In Astro T5 OD Trans (250 I6) All GM Off the Shelf Parts-1965 C10 SBSS

[Sharps40]

Just checked, I quoted a 27.3% ratio reducer with that 19 tooth driven, 9 tooth drive and 3.73 out back and the 27.4" tall tires.

By some struggling thru the math, I calculate my speedo reads one mph faster than actual.

Watchin Mistress Garmin, the speedo is dead on....likely the speedo ain't accurate enough at nigh onto 50 years old to pick out a mile or three per hour difference anywho.

Luck to ya!