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06-24-2012, 12:52 PM
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#1 |
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Registered User
Join Date: Oct 2009
Location: Broken Arrow, OK
Posts: 1,220
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Change of gears need retuned?
I'm looking at changing my 3.07 dana 36 rear over to the optional 3.54 or 3.75 gears. What I don't know is does the ecm for my 01' 5.3l have to be changed? Can't the shift points stay the same? And since I have a programmable electronic speedomoter I don't need it there. Just not sure if the ecm uses the gear info for anything else like timing or such. Thanks for any info.
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06-24-2012, 02:13 PM
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#2 |
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A guy with a truck
Join Date: Sep 2005
Location: Germany, for now
Posts: 5,920
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Re: Change of gears need retuned?
PCM will need to know. It uses VSS from your trans tailshaft for determining shift points, which will change with the different gear ratio.
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