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: speedometer drive/driven determination larietrope Dec 13th, 07, 4:41 AM Muncie 4-speed m-20 3:08 rear gear P245x60x15 tires Can someone give me the correct drive/driven ratio to correct my speedometer ? Many thanks. Jeff74 Dec 13th, 07, 8:04 AM http://www.novaresource.org/speedo.htm I figureed from this chart and it was within 3 mph. yours should be 8 teeth on drive gear 19 teeth on driven gear GMPETE Dec 13th, 07, 10:27 AM 19 tooth(white) goes into the tranny(passenger side rear). Pete 2k3Chevelle468 Dec 13th, 07, 1:50 PM Try this - http://www.bgsoflex.com/speedo1.html JodysTransmissions Dec 13th, 07, 9:25 PM Muncie 4-speed m-20 3:08 rear gear P245x60x15 tires Can someone give me the correct drive/driven ratio to correct my speedometer ? Many thanks. P245x60x15 = 26.6" (diameter) x 3.08:1 Drive / Driven 8 (1.84" dia.) / 19 9 (1.84" dia.) / 21 Yes, there is a nylon 9 tooth drive gear available for the 27 spline mainshaft. Choose the best drive gear for future driveline changes. I hope this helps. Wally Dec 14th, 07, 9:58 AM P245x60x15 = 26.6" (diameter) x 3.08:1 Drive / Driven 8 (1.84" dia.) / 19 9 (1.84" dia.) / 21 Yes, there is a nylon 9 tooth drive gear available for the 27 spline mainshaft. Choose the best drive gear for future driveline changes. I hope this helps. HMMMM, 9 tooth nylon means you need to drill a hole in the main shaft unless you are lucky enough to have a 69 shaft when GM tried the POS plastic gear and trashed it the very next year. Use the metal gear, when I find one with the pastic gear it goes in the trash and a metal gear goes in. larietrope Dec 14th, 07, 10:01 AM Thanks guys. JodysTransmissions Dec 15th, 07, 12:03 AM HMMMM, 9 tooth nylon means you need to drill a hole in the main shaft unless you are lucky enough to have a 69 shaft when GM tried the POS plastic gear and trashed it the very next year. Use the metal gear, when I find one with the pastic gear it goes in the trash and a metal gear goes in. I also agree with Wally, use a steel drive gear over the nylon drive gear every time you have the option on a Muncie. But mostly, I think the problem was the light duty designed metal clip securing the nylon drive gear to the mainshaft. ST10s, and Richmond 4-5-6 speeds use nylon drive gears but, they are secured in place with snap rings and machined splines. These transmissions seldom have nylon drive gear issues like a Muncie. | ||