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Tech/Performance/Info >> Transmission and Differential Questions and Solutions >> TH 350 speed gear
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Message started by A.Sharpe on Mar 12th, 2016 at 6:11pm

Title: TH 350 speed gear
Post by A.Sharpe on Mar 12th, 2016 at 6:11pm
  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.
:-X :-X :-X :-X :-X :-X

Title: Re: TH 350 speed gear
Post by Artsvettes on Mar 13th, 2016 at 12:05pm
  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

Title: Re: TH 350 speed gear
Post by Knotacare on Mar 13th, 2016 at 3:09pm
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=cheesy.gif]
Alan [smiley=beer.gif]

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