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11-17-2004, 04:12 AM
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#1 |
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Its Magically Delicious
Join Date: Jan 2003
Location: oregon
Posts: 2,398
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How to properly correct my speedo
After the rear end ratio change ..
I went from 3.07 to 3.42 .... just recently hooked up a tach and notice my tach says 2500 rpm at 70 mph .. should be sitting at roughly 3,000 rpm.... Suggestions ? 
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71 C10 LWB 350sbc -TH350 12 bolt 3.42 Posi Of all my favorite things to do, The utmost is to have a brew. My love grows for my foamy friend, with each thirst-quenching elbow bend. Beer so frosty, smooth, and cold it's paradise pure liquid gold. Yes beer means many things to me that's all for now cus I gotta pee. |
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11-17-2004, 08:18 AM
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#2 |
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67-72 Addict!
Join Date: Feb 2002
Location: The TAX State!
Posts: 7,856
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You need the correct plastic gear on the side of the tranny. It's inside the bullet on the end of the cable.
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Jim 1970 C/10 Fleetside w/Ghost Flames Lowered 4.5" front and 4" rear (Raked) 355/350 Turbo w/shift kit 10" Redneck Performance Verter w/2500 stall Hooker Super Comps part#2808-1 Performer RPM Air-Gap 12 Bolt w/3:73 gears- Eaton Posi Comp Cams XE262 with 1.6 Crane Energizers, Road Demon 625 and Brodix IK 180 heads |
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11-19-2004, 01:31 AM
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#3 |
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Registered User
Join Date: May 2003
Location: Shreveport LA
Posts: 3,170
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Count the teeth on the driven gear (the one hooked to the cable). Multiply that number by 3.42 and divide by 3.07. If you're lucky, it will come out a whole number or close enough to round off. Get a new driven gear with that many teeth. If not, you'll need to change the drive gear also (the one on the tailshaft). Go to this site with your tire diameter & you can find what combination to use. http://novaresource.org/speedo.htm
Tire diameter can be calculated here http://tciauto.com/tech_info/speedo_gears.htm |
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