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TH 350 speed gear (Read 503 times)
Mar 12th, 2016 at 6:11pm

A.Sharpe   Offline
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  Have a 79 with TH 350. Originally 3.55 gears. Changed to 3.08 gears now speedo is off. Test drove with GPS and at 45 mph actual speed is 55.  At 57 mph actual speed is 72/73mph. Anyone know what color gear I need.
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Reply #1 - Mar 13th, 2016 at 12:05pm

Artsvettes   Offline
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New Jersey

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  It would be best to do a search on speedometer gear calculator. You type in your info and it will tell you. I say this because going by the GM part numbers will bring you close and todays tires will be a little off from what Gm has listed in the parts manual. I looked through it and it gave me a headache of all the different gears they have listed...........jack
 

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Reply #2 - Mar 13th, 2016 at 3:09pm

68-73   Offline
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NCRS Member 68,73,77 Corvettes
Newark,Delaware

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I went thru the same thing on my Dodge...finally gave up and settled on a 10mph difference. But who cares it just goes fast anyway. Smiley
Alan Smiley
 
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