'59 Speedo drive gear for 700r4 ?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

paul5663 · 11-05-2007, 08:55 PM

I bought a rebuilt 700r4 for my '59 but it didnt come with a speedo drive gear. I want to use the original speedo. Anyone know which gear to use (approx) using 18" wheels on rearend? If not, how 'bout a formula to figure it out? Thanks......Paul

http://67-72chevytrucks.com/vboard/s...d.php?t=229882

solidaxel · 11-05-2007, 09:17 PM

Do you still have the one from your transmission you took out of the truck?

paul5663 · 11-05-2007, 09:55 PM

No, unfortunately, I bought the truck minus the drivetrain.
Paul

entourageguy · 11-06-2007, 07:48 AM

found this

Speedometer Calculation Formula
The SAE Standard for Speedometers on American cars is set up so that the speedometer cable will turn 1,000 rpm at 60 mph or 1000 revolutions in 1 mile.

Simply multiply the rear axle gear ratio by the speedometer drive gear, divide that by the tire diameter and multiply this by 20.2 (a constant).

The following formula can be used to determine the correct speedometer driven gear.

Driven Gear = Gear ratio X Speedometer Drive Gear divided div. by TireDia = a

a X 20.2 = Number of Teeth on Speedometer Gear

Brian ...

solidaxel · 11-06-2007, 04:10 PM

Do you have any idea what gear ratio the rear end is, 2:00, 3:00, or 4:00

solidaxel · 11-06-2007, 04:15 PM

Do you have the gear installed on the mainshaft of the transmission, inside the tail shaft?

paul5663 · 11-07-2007, 07:03 PM

Well, the rearend is a Dana 36 w/ 2.59 gears.

paul5663 · 11-07-2007, 07:09 PM

Ooops! submitted before I was done w/ message! Anyway, thanks for replies...Brian, I will try it out.
Paul

http://67-72chevytrucks.com/vboard/s...d.php?t=229882

11-05-2007, 08:55 PM	#1
paul5663 Registered User Join Date: Feb 2007 Location: Hilton, NY Posts: 47	'59 Speedo drive gear for 700r4 ?? I bought a rebuilt 700r4 for my '59 but it didnt come with a speedo drive gear. I want to use the original speedo. Anyone know which gear to use (approx) using 18" wheels on rearend? If not, how 'bout a formula to figure it out? Thanks......Paul http://67-72chevytrucks.com/vboard/s...d.php?t=229882

11-05-2007, 09:17 PM	#2
solidaxel Registered User Join Date: Dec 2002 Location: Cactus Patch So. Az Posts: 4,749	Re: '59 Speedo drive gear for 700r4 ?? Do you still have the one from your transmission you took out of the truck? __________________ 53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42

11-05-2007, 09:55 PM	#3
paul5663 Registered User Join Date: Feb 2007 Location: Hilton, NY Posts: 47	Re: '59 Speedo drive gear for 700r4 ?? No, unfortunately, I bought the truck minus the drivetrain. Paul

11-06-2007, 07:48 AM	#4
entourageguy Yellow truck club Join Date: Apr 2006 Location: Barrie Ontario Posts: 2,080	Re: '59 Speedo drive gear for 700r4 ?? found this Speedometer Calculation Formula The SAE Standard for Speedometers on American cars is set up so that the speedometer cable will turn 1,000 rpm at 60 mph or 1000 revolutions in 1 mile. Simply multiply the rear axle gear ratio by the speedometer drive gear, divide that by the tire diameter and multiply this by 20.2 (a constant). The following formula can be used to determine the correct speedometer driven gear. Driven Gear = Gear ratio X Speedometer Drive Gear divided div. by TireDia = a a X 20.2 = Number of Teeth on Speedometer Gear Brian ... __________________ ................................................................ Brian ...... My hub garage address http://www.hubgarage.com/mygarage/59apache I gue$$ everything has it'$ price ALL GONE NOW *59 Chev Apache* *PRAISE THE LOWERED* 350 700r lokar shifter power MII front end, shockwaves tilt, 4 wheel discs 4-link and bags 10 bolt limited Last edited by entourageguy; 11-06-2007 at 07:55 AM.

11-06-2007, 04:10 PM	#5
solidaxel Registered User Join Date: Dec 2002 Location: Cactus Patch So. Az Posts: 4,749	Re: '59 Speedo drive gear for 700r4 ?? Do you have any idea what gear ratio the rear end is, 2:00, 3:00, or 4:00 __________________ 53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42

11-06-2007, 04:15 PM	#6
solidaxel Registered User Join Date: Dec 2002 Location: Cactus Patch So. Az Posts: 4,749	Re: '59 Speedo drive gear for 700r4 ?? Do you have the gear installed on the mainshaft of the transmission, inside the tail shaft? __________________ 53 TuTone Extended Cab 350 4-Spd 3:08 (SOLD) 53 Chevy Moldy pearl green ZZ-4 4L60E 9" 3:25 55 GMC 1st Black Mll (ZZ4) ZZ6 TKO 600 5 sp 3:73 62 Solidaxle Corvette Roman Red (327 340hp 4spd 3:36) C4 & C5 suspension tube chassis LS 3 4L70E 65 Corvette Coupe 327 350hp 4spd 4:11 78 Black Silverado SWB (350/350) 5.3 & 4L60E 3:42 2000 S-Type 3.0 (wife cruiser) 2003 GMC SCSB 5.3 4L60E 3:42

11-07-2007, 07:03 PM	#7
paul5663 Registered User Join Date: Feb 2007 Location: Hilton, NY Posts: 47	Re: '59 Speedo drive gear for 700r4 ?? Well, the rearend is a Dana 36 w/ 2.59 gears.

11-07-2007, 07:09 PM	#8
paul5663 Registered User Join Date: Feb 2007 Location: Hilton, NY Posts: 47	Re: '59 Speedo drive gear for 700r4 ?? Ooops! submitted before I was done w/ message! Anyway, thanks for replies...Brian, I will try it out. Paul http://67-72chevytrucks.com/vboard/s...d.php?t=229882



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