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10-25-2008, 07:24 PM
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CC Member
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Join Date: Oct 2008
Cobra Make, Engine:
Posts: 89
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Not Ranked
bouncing speedo
ok i just went through the complets superformance section looking for this and nothing, i remember reading it but now cant find it. any cure the bouncing speedo? tips in doing so, what to do tips , tricks?
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10-25-2008, 07:56 PM
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CC Member
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Join Date: Oct 2006
Location: Des Moines,
IA
Cobra Make, Engine: SPF 545" stroked 460 - sold
Posts: 239
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Not Ranked
Well I went thru that a bunch of times, one broken speedo, one broken reverse angle drive, new cable etc my cure was a Smiths electronic speedo. Now perfectly steady, accurate, digital odometer  Assuming you want to keep you mechanical Smiths, things to try are lubricate the cable (grease not oil) straighten any kinks in the routing - get underneath and make sure it makes only gentle bends - make sure connection at trans is free of bind, check the speedo gear for burrs or missing teeth (it is just plastic and easily damaged). Next is check your reverse angle gear, it should spin freely with no bind - it just unscrews from the back of the Smiths. Finally check your Smiths itself for bind internally - spin the inlet see if it moves freely. If any probs I suggest send it off to Nisongers for professional repair tho some take apart and service their own... All just IMHO  others can fill in their fixes  There is a ton of data on this over at SCOF as well.
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10-25-2008, 08:00 PM
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Senior Club Cobra Member
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Join Date: Aug 1999
Location: Carlsbad,
CA
Cobra Make, Engine: Previous owner of SPF#1938, with a Keith Craft 496ci Genesis 427 side oiler, 667 FWHP, 633 FWTQ, 560 RWHP, 550 RWTQ.
Posts: 1,303
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Not Ranked
Disconnect the speedo cable from the reverser gear and shorten the cable tip by 1/4" to 3/16". Debur the tip and reassemble the cable into the reverser gear.
__________________
Jim Woodard
Don't interfere with somethin' that ain't botherin' you none.
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10-25-2008, 09:49 PM
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CC Member
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Join Date: Sep 2002
Cobra Make, Engine: SPF#0760
Posts: 3,404
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Not Ranked
First try reorienting the cable. Make all bends smooth. Turns and angles to a minimum...Then do the cable shortening suggestion.
__________________
Wiring Diagrams: SPF MKII, MKIII, GT40, CSX7000, CSX8000, Corvette Grand Sport, and Shelby Sebring, Bondurant & Cinema Tribute Cars.
Owner’s Manuals: SPF MKII, CSX7000, CSX8000, Sebring, Bondurant, Cinema Tribute Cars $ GT40’s..
Large, easy to read and trace schematics with part numbers, wire colors, wire gauge, fuses, and electrical upgrade information. Trouble-shooting and replacement part numbers for those roadside repair adventures.
SPFWiringDiagrams@Comcast.net
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10-26-2008, 05:21 AM
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Senior Club Cobra Member
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Join Date: Sep 2003
Location: Kingwood,
WV
Cobra Make, Engine: SPF 2682, Roush 427
Posts: 219
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Not Ranked
Try a NAPA 615-1644 cable. Just lubricate the cable before installing.
This cable is the right length and wound for the direction of rotation.
Chet
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