Computer Diagnostics and Tuning Technical discussion on diagnostics and programming of the F-body computers

Brain dead - appreciate help

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Old Jun 9, 2015 | 02:18 PM
  #1  
KYWes's Avatar
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Brain dead - appreciate help

Ok, so I got a new PCMFORLESS tune today that is programmed for the rear end I am getting which is to have a 3.73 gear ratio. I currently have the stock 3.42 ratio. Will my speedometer read too fast or too slow?
Old Jun 9, 2015 | 03:21 PM
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Re: Brain dead - appreciate help

It's going to read 8.3% lower than actual speed. At a true 60 MPH your speedo will be showing 55 MPH.
Old Jun 9, 2015 | 03:36 PM
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KYWes's Avatar
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Re: Brain dead - appreciate help

Thanks, that's probably not a bad thing. LOL
Originally Posted by Injuneer
It's going to read 8.3% lower than actual speed. At a true 60 MPH your speedo will be showing 55 MPH.
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