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11-23-2009, 09:39 AM
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Turbo 350 speedo help.
Got a 78 T/A, pontiac 400, turbo 350 with 3.73 gears and 28" tall tires, my problem. What in the world speedo gears do i use?!!? It has a 30-something tooth driven gear in it now, but the drive on is worn out so ill replace both the drive and driven gears. Just need some help finding out which two i need, and possibly the part numbers for them. Before it was right on with 2.56 gears, but the gear wore out just before i changed to the 3.73's, so i dont have anything to compare to. thanks for any help!
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11-23-2009, 05:54 PM
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A 9 tooth drive and 24 tooth driven gears will get you the 2.66 speedometer gear ratio you need according to the di-it-yourself math equation calculator on Transmissioncenter.net's website for speedometer gear parts. BUT the 24 tooth gear isn't available for the TH-350 from them, drive gears are available in 7, 8, 9, or 10 tooth, and driven gears are available in 17, 18, 19, 20, 21, & 22 tooth count gears. LINK HERE.
Their linked online calculator can be found HERE. The linked calculator says you can use a combination of a 7 tooth drive and 19 tooth driven, OR 8 tooth drive and 21 tooth driven gears.
__________________
I'm actually making progress on my 1988 Suburban TH-700R4 to SM-465 transmission swap, CLICK HERE TO CHECK IT OUT. CanAm Chevelle Club 700R4 Basics 700R4 Basics W/pics ______
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11-23-2009, 10:24 PM
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forgot to mention, it has the large driven gear, about an inch and a half across, not the smaller one.
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11-25-2009, 02:42 AM
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Quote:
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12-07-2009, 08:41 PM
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http://novaresource.org/speedo.htm has the formula you need and the available gear combinations for both sizes of driven gear.
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