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CC Advertisers
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04-01-2011, 08:21 AM
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CC Member
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Join Date: Aug 2009
Location: Atlanta,
GA
Cobra Make, Engine: 86 Everett Morrison 90" WB. 428 FE
Posts: 1,151
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Not Ranked
3/4" DD Shaft
What is the recomended minimum shaft size for manual steering? Does 3/4" DD make it? I'm thinking 3/4" splined?
Ralphy
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04-01-2011, 09:01 AM
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CC Member
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Join Date: Jul 2003
Location: Charlotte,
NC
Cobra Make, Engine: Kellison Stallion, 429 SCJ,
Posts: 109
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Not Ranked
3/4" shaft has been the industry standard for US applications since the 1970's. If the rest of the system such as U-joint angles, connections, bearing supports, etc. are properly designed, this shaft size is more than sufficient for a manual steer vehicle in the weight range of a Cobra.
__________________
Stallion112
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04-01-2011, 09:11 AM
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CC Member
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Join Date: Jun 2008
Location: Chester Springs,
PA
Cobra Make, Engine: Kirkham 289 FIA #690, FRPP 427 Boss engine
Posts: 764
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Not Ranked
3/4 DD is perfect for the shaft, you will only need a 3/4 DD to splined u-joint for the connection to the steering rack. There is a different sized spline depending on a power or manual rack.
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RCR GT40 SOLD to Fast 5
Kirkham #690 289 FIA
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04-01-2011, 09:20 AM
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CC Member
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Join Date: Aug 2009
Location: Atlanta,
GA
Cobra Make, Engine: 86 Everett Morrison 90" WB. 428 FE
Posts: 1,151
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Not Ranked
Thanks Guys,
Just read on Flaming Rivers site 15 degree max angles work best. I also started thinking the rack input shaft is only 9/16".
Power steering has also been standard since when? 
Last edited by Ralphy; 04-01-2011 at 09:27 AM..
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04-01-2011, 12:30 PM
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CC Member
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Join Date: Jun 2008
Location: Chester Springs,
PA
Cobra Make, Engine: Kirkham 289 FIA #690, FRPP 427 Boss engine
Posts: 764
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Not Ranked
Hey, some people even use, God forbid, Chevy engines! 
__________________
RCR GT40 SOLD to Fast 5
Kirkham #690 289 FIA
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04-01-2011, 03:37 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
Borgeson, Flaming River and all use 3/4 as their standard. They are also available in aircraft aluminum 3/4. I like steering to be steel personally. Make sure you put a groove or indent with any u-joints to stop them pulling apart. There was a guy on here a couple of months back that suffered from DD (dangerous disassembling) problems.
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04-01-2011, 05:47 PM
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CC Member
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Join Date: May 2008
Location: Sacramento,Ca.,
Ca.
Cobra Make, Engine: Midstates (2001)
Posts: 1,724
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Not Ranked
Speedway Motors sells a stainles steel (polished) 3/4 dd shaft that looks good....
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04-01-2011, 06:12 PM
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CC Member
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Join Date: Aug 2009
Location: Atlanta,
GA
Cobra Make, Engine: 86 Everett Morrison 90" WB. 428 FE
Posts: 1,151
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Not Ranked
Nick, yeah I have seen to many set screws loosen. Thanks Bob.
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