5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

speedo showing way too fast

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Old 05-20-2008, 06:02 PM
  #1  
89cobra5.0
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Default speedo showing way too fast

I went to 3.73's and my speedometer obviously is reading off. what specific gear do I need to get it running accurately?
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Old 05-20-2008, 06:38 PM
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Does Not Exist
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Default RE: speedo showing way too fast

21 tooth gear. Make sure ya get the correct one for your tranny though.


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Old 05-20-2008, 07:06 PM
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mjr46
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Default RE: speedo showing way too fast

red 21
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Old 05-20-2008, 08:25 PM
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nitrous_bob
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Default RE: speedo showing way too fast

yes, if it's an '89 t5 then red 21 driven gear

if it's aod, nothing
if it's newer than '90 trans... nothing w/ out swapping out the drive gear
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Old 05-20-2008, 10:24 PM
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Does Not Exist
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Default RE: speedo showing way too fast

Yeah, red 21...I knew that.[sm=nerd.gif]
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Old 05-22-2008, 01:22 AM
  #6  
89cobra5.0
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Default RE: speedo showing way too fast

ya its an '89 5speed manual. so the red 21 tooth?
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Old 05-22-2008, 07:58 AM
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88BlueGT
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Default RE: speedo showing way too fast

yup.
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