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It takes you 68 seconds to go 1 mile at 60mph that is roughly a -11.8% change. You will need to work within your driven gear series to speed up your odometer/speedometer. If you have a 21 tooth driven gear; 21 - 11.8% = 18.5 which would round up to the 19 tooth driven gear. Jody Haag 610-413-8015. Jody's Transmissions on Facebook.
This Heavy Duty 3-speed, depending on year, is called either a Dearborn (1965-1969) or a Muncie (1970-1973) M13 unit, and utilizes the code M13 on the sheets. Surprisingly, a 3-speed transmission was the standard transmission for all GTO’s from 1964 through 1972, although in its initial year of 1964, the 3-speed was an M12 unit made by Muncie ...
At 75 MPH, with a 3.31:1 gear ratio and a 27.1" tall tire, your engine will be turning 3078 RPM. The same combination with a 3.42:1 gear ratio will put you at 3180 RPM. The same combination with a 3.55:1 gear ratio will put you at 3301 RPM. The same combination with a 3.73:1 gear ratio will put you at 3468 RPM.
The 2.20:1 ratio first gear is usually referred to as the Muncie M21 transmission; based on GM's production codes. The 2.56:1 ratio is referred to as the M20. Muncie also had a second close-ratio transmission coded M22 and known as the "rock crusher," which was used behind performance big-block engines and in some Corvettes. These M22 units are ...
Question for Muncie speedo gear experts. For those of you who know Muncies intimately, you know that there are GENERALLY (emphasis on generally) two DRIVE gears: 8 teeth 1.84in and 8 teeth 1.76in. The larger 1.84 drive gear mates with the smaller 17-18-19-20-21-22 teeth side gears. The smaller 1.76 drive gear mates with larger 22-23-24-25 teeth ...
Help identifying this Muncie 4-speed. Looking for some group assistance in identifying exactly which Muncie 4-speed transmission this is. (pics) I just pulled out of my '67. Thx in advance! Post another pic of the input shaft where it shows the pilot bushing back to the bearing retainer. There's grooves there that give the 1st gear ratio.
According to the chart below (cell phone views only sideways) you need to go from a blue (20) to a brown (18). You need to verify if these are not original but you will be going smaller. Bigger gear on shaft spins smaller gear faster to speedo. Hope this helps. 18-22 tooth .810 diameter gears must be used with a 1.84 OD speedo drive gear.
36 posts · Joined 2009. #1 · Nov 24, 2016. I have a 1966 chevelle with 383 stroker engine and a muncie 4 speed transmission. I replaced my stock 3:08 gears in my rear end with 3:73 gears. I am currently running about 2800 rpm at 60 mph with my new gears. Which I feel is pretty high. Id like to lower my rpms at highway speeds and keep my 3:73 ...
Since I changed gear ratio's I need to change the M20 speedo gear. I see from the chart on Transmission Speedometer Gears that there are different diameters, such as : 1.76 and 1.84 and 1.94 for gear with the same number of teeth. It also mentions you have the match the Drive gear that you have with the correct diameter speedo gear.
I run a 2.87 first gear in my tko, and a 4.56 rear gear for 13.08 total. I wish I had got the TKO500 stricktly for the 3.27 first gear ratio. Starting line gear ratio is EVERYTHING for a street/strip stickshift car. 67 Camaro ,Nash 5sp crashbox, 6.0 LS. best to date 10.79 @ 129. 3500lb street car.