Check the listing for details. GM TH350 POWERGLIDE SPEEDOMETER GEAR SET 18 19 20 21 22 TEETH DRIVEN GEARS. Condition: New. Listed at 19.00 USD. Powered by eBay Turbo Lister The free listing tool. List your items fast and easy and manage your active items. GM TRANSMISSION DRIVEN SPEEDOMETER GEAR SET 18 19 20 21 22 TEETH 18 Brown 19 White 20 Blue 21 Red 22 Grey COMES WITH NEW O-RING INNER SEAL NOT INCLUDED Gears Meet or Exceed OEM Quality Gears have a higher percentage of fiberglass giving them a higher temp rating and increasing tinsel strength for the drive cable. Colors may very Helpful tips Driven gear: Fewer teeth will speed up the speedometer reading, more teeth will slow down the reading. For every tooth added or subtracted is + or - 2mph. Drive gear: Fewer teeth will slow down the reading and more teeth will speed up the reading. For every tooth added or subtracted is + or - 10mph. CHECK OUT OUR OTHER GREAT PRODUCTS