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06-04-2012, 03:47 PM
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#1 |
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Registered User
Join Date: Nov 2011
Location: powhatan virginia
Posts: 402
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Speedometer Off
I had seen a thread on this forum that had a formula to calculate which speedometer gear for a Turbo 350 and where to purchase. I am running 275/65/15 tires, 307 12 bolt rear and my speedometer is off about 18-20 MPH.
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1970 442 convertible 1970 Cutlass SX 1962 Chevy Stepside 2011 GMC 3500HD Crewcab SLT DRW |
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06-04-2012, 05:06 PM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,736
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Re: Speedometer Off
Instead of looking for and changing the drive or the driven gear I've used an adaptor on several of mine that where off. They come in various ratios.
Here's a link to one on ebay. http://www.ebay.com/itm/NOS-AC-DELCO...e46614&vxp=mtr |
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06-04-2012, 05:49 PM
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#3 |
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Registered User
Join Date: Nov 2009
Location: Galt, Calif
Posts: 2,437
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Re: Speedometer Off
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`64 C10 vortec 350/350/373 posi `69 RS/SS 350/350/308 `37 Ford 406/350/324 traclock `68 Dart 370/904/323 suregrip |
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06-05-2012, 08:02 AM
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#4 | |
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Registered User
Join Date: Nov 2011
Location: powhatan virginia
Posts: 402
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Re: Speedometer Off
Quote:
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1970 442 convertible 1970 Cutlass SX 1962 Chevy Stepside 2011 GMC 3500HD Crewcab SLT DRW |
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06-05-2012, 08:07 AM
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#5 | |
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Registered User
Join Date: Feb 2012
Location: Ruskin Florida
Posts: 4,567
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Re: Speedometer Off
Quote:
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70 swb 4x4 406sbc 700r4 203/205 d60/14blt locker yadda yadda http://67-72chevytrucks.com/vboard/s...88#post6935688 Yeller 72 Blazer 2wd conversion project "No Daggum Money" http://67-72chevytrucks.com/vboard/s...d.php?t=550804 LS1-T56 3.73 LSD super budget build Blanco-2014 Sierra SWB https://67-72chevytrucks.com/vboard/...d.php?t=810350 |
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06-05-2012, 09:24 AM
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#6 |
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"Where were you in '62?"
 
Join Date: Jul 2004
Location: Cleveland County, North Cackalacky
Posts: 5,013
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Re: Speedometer Off
  http://www.tciauto.com/tc/speedometer-gear-calculator http://www.bgsoflex.com/speedo1.html http://www.chevymania.com/tech/speedo.htm http://www.transmissioncenter.org/GM...eter_Gears.htm http://www.transmissioncenter.net/sp...____va.htm#350 http://www.jegs.com/webapp/wcs/store...edometer+Gears Had to replace my Speedometer outside O-ring on the Speedometer Gear Housing. The gear was ok. And I cant remember if it was a 18 Tooth. You can buy them from 18 to 23 Tooth... I also had to replace the seal that goes inside the Speedometer Gear Housing as well. Replaced the rear main seal to. My truck is 8mph off according to the GPS. No big deal to me since I don't drive it much. I may change the Speedo Gear later, but now I cant remember what # of teeth I need to get now. The guy at the Chevrolet dealership told me. Should of wrote it down.
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PROJECT: "FULL METAL YELLOW JACKET" 1962 Chevy C-10 Stepside Shortbed Nostalgia Pro/Street Pickup Truck PROJECT: "FULL METAL YELLOW JACKET Build Thread What Are You Workin' On? - 1Bad62ChevyPickup PROJECT: "TYRANNORAMBLER REX" 1969 AMC Rambler American Nostalgia Pro/Street Youtube Channel: Father Son Projects Youtube Channel: 2TIMOTHY2FITHTEEN  "North and South Carolina Folks Click Here!" (((( ~ I have Parts For Sale & Miscellaneous Stuff ~ )))) "Well being as there's no other place around the place, I reckon this must be the place, I reckon...Nyuk Nyuk Nyuk" -Curly Howard Ph.D. Last edited by 1Bad62Pro/Street; 06-05-2012 at 09:32 AM. |
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