Figuring speedo gears.... - The 1947 - Present Chevrolet & GMC Truck Message Board Network

44th Miss Inf · 11-21-2005, 04:17 PM

Anyone know the formula to figure out which speedo gears (the one that goes on the tailshaft, and the one the cable attaches to) I need? I have both wiped out in my transfer case (208C, 82 model) My speedo was off, and since I am buying new gears, would like to get the speedo right.
Truck is a 82 3/4T 4x4 w/ 3.73 gears and 33 inch tall tires.

Thanks,
Virgil

swb85 · 11-21-2005, 06:54 PM

Try here. This is where I figured out my speedo gears.

http://novaresource.org/speedo.htm

79BIG10 · 11-21-2005, 10:21 PM

Also try here http://www.73-87.com/7387garage/drivetrain/speedo.htm

44th Miss Inf · 11-22-2005, 10:44 AM

Thanks, I did a search, but must not have been using the right key words. These helped me figure out what I needed.

Thanks again,

Virgil

11-21-2005, 04:17 PM	#1
44th Miss Inf Registered User Join Date: Sep 2002 Location: Liberty, Mississippi Posts: 672	Figuring speedo gears.... Anyone know the formula to figure out which speedo gears (the one that goes on the tailshaft, and the one the cable attaches to) I need? I have both wiped out in my transfer case (208C, 82 model) My speedo was off, and since I am buying new gears, would like to get the speedo right. Truck is a 82 3/4T 4x4 w/ 3.73 gears and 33 inch tall tires. Thanks, Virgil

11-21-2005, 06:54 PM	#2
swb85 On a budget like Fred Sanford Join Date: Oct 2005 Location: Topeka, KS Posts: 2,031	Re: Figuring speedo gears.... Try here. This is where I figured out my speedo gears. http://novaresource.org/speedo.htm __________________ '85 Silverado swb: 383 stroker, 10.5:1, vortec heads, 232/238 roller cam, RPM air gap, performer 750 carb, stainless longtubes, 3" duals/super 44's, T56/4.11 383ci build / exterior refresh thread '98 Camaro z28: 370ci twin turbo 370ci build '01 Tahoe LT 4x4: 5.3, longtubes/ory, magnaflow duals, custom tune....wife's DD

11-21-2005, 10:21 PM	#3
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,774	Re: Figuring speedo gears.... Also try here http://www.73-87.com/7387garage/drivetrain/speedo.htm __________________ 1979 Chevrolet Bonanza Big10 "Tootsie Roll" 1985 Chevrolet Silverado (wife's) Member of the Southern Bowties Club "Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson

11-22-2005, 10:44 AM	#4
44th Miss Inf Registered User Join Date: Sep 2002 Location: Liberty, Mississippi Posts: 672	Re: Figuring speedo gears.... Thanks, I did a search, but must not have been using the right key words. These helped me figure out what I needed. Thanks again, Virgil



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