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SVT Shelby GT500
A tale of two shifters...
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<blockquote data-quote="Tob" data-source="post: 14201129" data-attributes="member: 83412"><p>I don't normally speak about PM's via the public forum but I received a somewhat technical PM that I think deems merit and further discussion here.</p><p></p><p></p><p></p><p>As much as Whiteline employed a somewhat similar method via their MT82 transmission bushing insert I'm not a fan of this type of solution in an effort to increase overall durometer. First, I do believe that factory designed and cast-in voids serve a purpose, generally. They allow articulation (however slight) in specific planes where movement is deemed necessary or preferable. This can help to minimize unwanted NVH as well as minimize added heat induced into the bushing by increased friction.</p><p></p><p>A year or so ago I spent some time searching for an aftermarket bushing for the rear of the factory GT500 shifter, all years '07-'14. The only listing I could find was for one made by Energy Suspension, # 4.1131G "shifter bushing set." The listing showed fitment across not only the GT500 but for the GT as well. <em>I knew that couldn't be</em> but ordered a set anyway just to see what would show up at my door. What finally showed up will definitely<em> not work </em>on a GT500.</p><p></p><p></p><p>The box included a rear mount bushing as well as two halves for a front fork bushing, clearly for the MT82 (fork bushings are the wrong diameter and width for the GT500 shifter as well). The ES pieces are in the center and the right. Factory GT500 bushing is on the left.</p><p></p><p>[ATTACH=full]579236[/ATTACH]</p><p></p><p>In addition to the rear bushing being the wrong width and height, the cast in slot where it would slide onto the shifter is inverted in comparison to the GT500 bushing.</p><p></p><p>[ATTACH=full]579237[/ATTACH]</p><p></p><p></p><p>But back on topic, note that ES is casting this bushing without any voids in a higher durometer than the factory GT bushing, in essence, only allowing the shifter to slide in one plane while severley limiting twist. In my view, there was very little engineering done and the voids were eliminated to lower the cost of manufacturing (which I don't see being passed off to the consumer). In addition, close examination of the ES bushing shows open pore casting bubbles as well as "peel." A much better solution to the ultra soft OEM bushing would be a properly engineered high durometer polyurethane bushing, ala the KR/FRPP bushing. The problem with the KR/FRPP bushing has been availability. The only way to get it is to either buy a complete KR or Ford Racing shifter assembly or to by a '08/'09 GT500KR<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" />. I have dug as deep as you can go with respect to obtaining these and it looks as if it may happen. If the stars line up it looks as though Van at Revan Racing may have these available soon, that being the high durometer KR/FRPP rear shifter bushing. It will fit all year factory GT500 shifter assemblies, '07-'14. It is the perfect complement to the solid front bushings Van currently carries. I've been running this combination since last year. It has served to change the shift quality from that of churning butter to a much more precise actuation device. I also use a direct mount stick as well with no isolation bushing. </p><p></p><p>For you guys that are looking to do the same, I hope Van pulls this one off.</p></blockquote><p></p>
[QUOTE="Tob, post: 14201129, member: 83412"] I don't normally speak about PM's via the public forum but I received a somewhat technical PM that I think deems merit and further discussion here. As much as Whiteline employed a somewhat similar method via their MT82 transmission bushing insert I'm not a fan of this type of solution in an effort to increase overall durometer. First, I do believe that factory designed and cast-in voids serve a purpose, generally. They allow articulation (however slight) in specific planes where movement is deemed necessary or preferable. This can help to minimize unwanted NVH as well as minimize added heat induced into the bushing by increased friction. A year or so ago I spent some time searching for an aftermarket bushing for the rear of the factory GT500 shifter, all years '07-'14. The only listing I could find was for one made by Energy Suspension, # 4.1131G "shifter bushing set." The listing showed fitment across not only the GT500 but for the GT as well. [I]I knew that couldn't be[/I] but ordered a set anyway just to see what would show up at my door. What finally showed up will definitely[I] not work [/I]on a GT500. The box included a rear mount bushing as well as two halves for a front fork bushing, clearly for the MT82 (fork bushings are the wrong diameter and width for the GT500 shifter as well). The ES pieces are in the center and the right. Factory GT500 bushing is on the left. [ATTACH=full]579236[/ATTACH] In addition to the rear bushing being the wrong width and height, the cast in slot where it would slide onto the shifter is inverted in comparison to the GT500 bushing. [ATTACH=full]579237[/ATTACH] But back on topic, note that ES is casting this bushing without any voids in a higher durometer than the factory GT bushing, in essence, only allowing the shifter to slide in one plane while severley limiting twist. In my view, there was very little engineering done and the voids were eliminated to lower the cost of manufacturing (which I don't see being passed off to the consumer). In addition, close examination of the ES bushing shows open pore casting bubbles as well as "peel." A much better solution to the ultra soft OEM bushing would be a properly engineered high durometer polyurethane bushing, ala the KR/FRPP bushing. The problem with the KR/FRPP bushing has been availability. The only way to get it is to either buy a complete KR or Ford Racing shifter assembly or to by a '08/'09 GT500KR:). I have dug as deep as you can go with respect to obtaining these and it looks as if it may happen. If the stars line up it looks as though Van at Revan Racing may have these available soon, that being the high durometer KR/FRPP rear shifter bushing. It will fit all year factory GT500 shifter assemblies, '07-'14. It is the perfect complement to the solid front bushings Van currently carries. I've been running this combination since last year. It has served to change the shift quality from that of churning butter to a much more precise actuation device. I also use a direct mount stick as well with no isolation bushing. For you guys that are looking to do the same, I hope Van pulls this one off. [/QUOTE]
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A tale of two shifters...
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