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12-27-2003, 12:46 AM
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#1 |
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Junior Member
Join Date: Aug 2003
Location: SW Nebraska
Posts: 50
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M-20 speedometer gears
I have a 67 C-10 with a Muncie M-20 4spd tranny. I have changed the rear end from a 3:73 to a 3:07. The tranny currently has a 19 tooth steel one piece gear. I will be using 235/75/ R15 (29 in dia.) tires. What speedo gear do I need to change to, and where do I get them. The two GM dealers that I went to do not have info that goes back that far. Please help! Todd
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Old Chevys never die they are just reborn! |
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12-27-2003, 01:04 AM
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#2 |
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1FINE69
Join Date: Aug 2003
Location: Detroit, Michigan
Posts: 239
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Go to TCI s transmission website they have lotsa good info to get you going in th right direction.
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Had a 69 swb fleetside 350zz3 w 400turbo trans oak lined bed with rhino coated sides red exterior. SOLD |
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12-28-2003, 05:21 AM
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#3 |
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Registered User
Join Date: May 2003
Location: Shreveport LA
Posts: 3,170
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My '79 Suburban with 3.07 gears & 29" tires (255/70-15) had a 9-tooth drive gear & a 20-tooth driven gear. The speedo matched the local police radar trailer at 50mph. My old M-20 had an 8-tooth steel drive gear, but I've never seen one with 19. An 8-tooth drive gear with an 18-tooth driven gear would be almost the same as my Sub. Check these sites out:
www.novaresource.org/speedo.htm www.novaresource.org/speedo2.htm www.tciauto.com/tech_info/speedo_gears.htm Last edited by jimfulco; 12-28-2003 at 05:33 AM. |
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