Transmissions and Drivetrain Need help with your trans? Problems with your axle?

Speedometer correction HELP

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Old Nov 20, 2009 | 03:00 PM
  #1  
DC1992Z28's Avatar
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From: OHIO
Car: 1992 Z28
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 10 BOLT 3.73 POSI
Speedometer correction HELP

From the factory my camaro had a 2.73 gear since it has been changed to a 3.73 , and my speedo reads way off, My understanding is that runs off a speed sensor on the transmission, how can I get the correct speed to register.
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Old Nov 20, 2009 | 03:26 PM
  #2  
John 89 Formula's Avatar
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Joined: Jul 1999
Posts: 853
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From: Everett, MA . USA
Car: 89 FORMULA FIREBIRD, 86 CHEVY CAMARO
Engine: L98, LB9 RESPECTIVLY
Transmission: 700 R4 (BOTH)
Re: Speedometer correction HELP

You need to change one or both of the speedo gears in the transmission tail housing, not sure which. The ratio is determined by the color of the gears and there are several different colors available. Also, if your car has the electronic speed sensor you may need to change the permanent magnet generator, because I do not think that gear alone is replaceable. Also the tail shaft has 2 mounting holes for the drive gear you may or may not need to move the gear to the other hole, if things don't fit back in right.
Do a search and you should be able to find the right combination.
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Old Nov 20, 2009 | 03:30 PM
  #3  
JamesC's Avatar
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From: Lawrence, KS
Car: Met. Silver 85 IROC/Sold
Engine: 350 HO Deluxe (350ci/330hp)
Transmission: T-5 (Non-WC)
Axle/Gears: Limited Slip 3.23's
Re: Speedometer correction HELP

Hey, DC,

Welcome to TGO. As you'll discover, using the search function on site is always a good idea. For the time being, check the stickies at the top of the page.

JamesC
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Old Nov 23, 2009 | 02:07 PM
  #4  
DC1992Z28's Avatar
Thread Starter
Junior Member
iTrader: (2)
 
Joined: Sep 2009
Posts: 9
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From: OHIO
Car: 1992 Z28
Engine: 305 TPI
Transmission: 700R4
Axle/Gears: 10 BOLT 3.73 POSI
Re: Speedometer correction HELP

Ok thanks for the info , yes im new to the site and it is very heplfull to have all of this knowledge at my disposal.
Thank Again.
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