I just put 3.73s in from 3.08s. This means that my speedo is reading about 125% of what it should. GM doesn't make speedo gears to fix the problem, does anybody know how I can fix this? I've heard of speed shops building some kind of add-on box with another set of gears to fix the problem. Anybody know anything about this???

Any help is greatly appreciated and needed,

Jason

 

Manual or automatic tranny, and what size tires?

[This message has been edited by Omar (edited January 23, 2001).]

 

Stock T-5 tranny and the stock 15" wheels and tires. The diameter of the tire when mounted is approximately 25" if that helps you all (I measured).

Jason

 

btt

 

Come on now, somebody knows something about this.

Jason

 

89BlwnRs,
I'm in the process of having my gears changed from 2.73 to 3.73. My car being an 86 has a mechanical driven speedometer, yours has the electronic so the regular ratio boxes wouldn't help you. Either of these sights can help you. Try:
http://www.specmo.com/NewFiles/Calib...libration.html

They deal with factory instruments as well as other things. I know they sell something that will work. For pricing and such you could also try:
http://www.speedometershop.com/ratio.html

Hope this helped you out

[This message has been edited by ryn28 (edited January 24, 2001).]

 

Actually I have a mechanical speedo, at least I'm pretty sure. Anybody know what 89s have?

Jason

 

89 Camaros have the cable speedo, and if you searched this board, you'd have seen that you need a 7 tooth purple drive gear, and a 21 tooth driven gear. I dunno its color, I think red?

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

You can get almost any t5 speedo gears from here. mike@forestparts.com

 

Kevin, that email address bounced. Are you sure its correct?

 

Well Kev, you were right about the 7/21 combo, except I just got off the phone and GM doesn't make a 21 tooth gear, just a 20 and 22. The only problem is the 20 tooth gear is $45.71.

But there's hope, instead I can buy a ratio adapter for $50 that'll get it pretty close, and I don't even have to remove the tailshaft of the transmission. Sounds good to me, just lettign everybody know about this.

Jason

 

What?? I need a 20 tooth gear for my setup! I was told they didnt make one. Maybe they dont make them for electronic speedos. The 21 tooth gear is stock in 3.73 cars from 83-85. Weird that they stopped making it. Someone mentioned that earlier.

 

before i ditch the car....... ok I have a '85 4 banger/5 speed firebird parts car (it's an SE tach, nice interior, 14" wheels and all) and I have a '88 camaro 2.8/auto. other than swapping out the rear to get the maro up to 3.73's where can I get this "gear" from the firebird to have my speedo read right????

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• 1988 Camaro Sport Coupe
• 2.8 V6
• TCI 3200 Stall TC
• B&M Transkit
• 2.5" 80 Series Flowmaster & Catback
• Hi-Flo Kitty
• '83 Z/28 Hood
• '87 IROC Wheels
• '92 Z/28 Bowtie Grille
• IROC Gauges
• IROC Taillights
• IROC Foglamps