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SVT Shelby GT500
A tale of two shifters...
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<blockquote data-quote="Tob" data-source="post: 14360630" data-attributes="member: 83412"><p>I have wanted to verify shifter stub lengths for some time now and today was the day for me to do it. I disassembled one of each iteration of factory GT500 shifter (07/08/09, KR/SVT, 10/11/12, 13/14). These are the numbers my vernier showed. Note that the dimension from the center of the fulcrum to the top of the stub is always the same. In essence, Ford played with the ratios but never raised or lowered the top of the shift knob. Dimensional changes were always from the center of the fulcrum to the center of the bolt for the actuation rod. Overall length of each stub is from top to bottom, not top to bolt center.</p><p></p><p>[ATTACH=full]596362[/ATTACH]</p><p></p><p></p><p>The 10/11/12 shifter stub is indeed a perfect match in terms of mechanical advantage to that of the KR/SVT (Ford Racing) shifter. Physically, the two differ in that the stick mounting faces are 90* apart from one another. Other than that they are identical. Makes you wonder why you don't hear the same proportion of KR owners (or those that added the FRPP shifter) complaining about second gear grind as the 10/11/12 owners.</p><p></p><p></p><p>The mechanical advantage of a lever is the ratio of the length of the lever on the applied force side of the fulcrum to the length of the lever on the resistance force side of the fulcrum. Here are the dimensions needed to check each respective shifter...</p><p></p><p>[ATTACH=full]596363[/ATTACH]</p><p></p><p></p><p>If my math is right this is what I get:</p><p></p><p>07/08/09 = 4.613 to 1</p><p>KR/SVT = 3.494 to 1</p><p>10/11/12 = 3.494 to 1</p><p>13/14 = 4.196 to 1</p><p></p><p>The above numbers were obtained by dividing the applied force side (8.35") of the fulcrum by the resistance side of the fulcrum (dependent on year).</p></blockquote><p></p>
[QUOTE="Tob, post: 14360630, member: 83412"] I have wanted to verify shifter stub lengths for some time now and today was the day for me to do it. I disassembled one of each iteration of factory GT500 shifter (07/08/09, KR/SVT, 10/11/12, 13/14). These are the numbers my vernier showed. Note that the dimension from the center of the fulcrum to the top of the stub is always the same. In essence, Ford played with the ratios but never raised or lowered the top of the shift knob. Dimensional changes were always from the center of the fulcrum to the center of the bolt for the actuation rod. Overall length of each stub is from top to bottom, not top to bolt center. [ATTACH=full]596362[/ATTACH] The 10/11/12 shifter stub is indeed a perfect match in terms of mechanical advantage to that of the KR/SVT (Ford Racing) shifter. Physically, the two differ in that the stick mounting faces are 90* apart from one another. Other than that they are identical. Makes you wonder why you don't hear the same proportion of KR owners (or those that added the FRPP shifter) complaining about second gear grind as the 10/11/12 owners. The mechanical advantage of a lever is the ratio of the length of the lever on the applied force side of the fulcrum to the length of the lever on the resistance force side of the fulcrum. Here are the dimensions needed to check each respective shifter... [ATTACH=full]596363[/ATTACH] If my math is right this is what I get: 07/08/09 = 4.613 to 1 KR/SVT = 3.494 to 1 10/11/12 = 3.494 to 1 13/14 = 4.196 to 1 The above numbers were obtained by dividing the applied force side (8.35") of the fulcrum by the resistance side of the fulcrum (dependent on year). [/QUOTE]
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A tale of two shifters...
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