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Old 04-12-2017, 05:50 PM   #6
Dead Parrot
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Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,461
Re: Advice on the gear ratio for 350 vortec with TH350 -

Since it is a mix of parts, it is very likely that the speedometer gear unit in the transmission isn't correct for your setup and giving a wrong speed reading. Get a chase vehicle or gps unit and confirm your speed.
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