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#1
08-05-2007, 01:59 PM
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Speedo gear help needed 1980 T/A
I have a 1980 Trans am non turbo, car is all stock. The car has orig 3:08 rear with stock tires ,27" diameter. When driving, the speedo reads too high, I think by quite a lot. When I pace traffic at around 40 MPH the speedo reads over 50 MPH. The TH350 trans is a replaced unit from the prior owner, so I am trying to get things right, as he did not . The drive gear appears to be green with 17 ot 18 teeth. The driven gear is a pinkish color with 35 teeth. My factory build sheet shows it needing a 42 tooth driven gear which is green, but the problem is, how do I find out which "drive gear" came in the car originally? Anyone out there have an idea ? Or better yet, with my 18 tooth drive gear retained, is there a driven gear I can use to attain correct speedo reading
 . TIA, Craig
Last edited by cdb; 08-05-2007 at 04:34 PM. |
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#2
08-05-2007, 02:11 PM
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This site has a calculator and all the gear info:http://tciauto.com/Products/TechInfo/speedo_gears.asp
__________________
1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/3.08 2002 WS6 Convertible LS1/4L60E/3.23 1966 VW Type 2 Single Cab Pickup 140hp 2276 1956 VW Type 2 Panel Van 36hp 1200 1957 VW Type 1 Beetle 180hp 2276 |
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#3
08-05-2007, 03:52 PM
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Thanks for the link. I now know what I need. Will get it this week. Craig
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