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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Apr 2005 Posts: 2,098 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,098 | John,
There are 3 speedometer driven gears currently available for the Muncie 3 speed or 3 speed OD transmissions: White 25 teeth, Yellow 24 teeth, and Green 22 Teeth. The drive gear does not have to be replaced to use either of them. I get the gears on ebay from Muttonhollow Chevy. He usually has the best prices.
Changing the gear oil is a good place to start but any grinding in 2-3 generally indicates a syncro problem. Don't rule out the clutch though.
Fred
Note: Earlier regular 3 speeds used a 19 tooth steel gear. They also use a different drive gear.
Also, the SM319 is a factory overdrive and would make a serious improvement in overall driving and also lower engine rpm's.
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
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