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Cobra R's
R-spec Tremec TR3550...?
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<blockquote data-quote="tomshep" data-source="post: 16961901" data-attributes="member: 8203"><p>There was no R-specific TR 3550 EVER. All Rs came with a 3550 with the .68 overdrive. When they started racing the Rs they discovered on the large tracks such as Daytona the cars couldn't accelerate when in OD with the factory 3.27 rear gears. So a .8 OD was substituted to allow the cars to accelerate. (I honestly can't remember if it was .87 or a slightly different ratio.)</p><p></p><p>When the TKO came out they did offer a .8 OD variation and it is a direct swap, but that was an upgraded 3550. 3rd gear is the weak link in the 3550 in our cars. If you are putting in a stronger motor than the stock 351 I would upgrade the tranny. Unless you plan on running it in a track environment I'd keep the .6 OD for better highway rpm.</p><p></p><p>Tom</p></blockquote><p></p>
[QUOTE="tomshep, post: 16961901, member: 8203"] There was no R-specific TR 3550 EVER. All Rs came with a 3550 with the .68 overdrive. When they started racing the Rs they discovered on the large tracks such as Daytona the cars couldn't accelerate when in OD with the factory 3.27 rear gears. So a .8 OD was substituted to allow the cars to accelerate. (I honestly can't remember if it was .87 or a slightly different ratio.) When the TKO came out they did offer a .8 OD variation and it is a direct swap, but that was an upgraded 3550. 3rd gear is the weak link in the 3550 in our cars. If you are putting in a stronger motor than the stock 351 I would upgrade the tranny. Unless you plan on running it in a track environment I'd keep the .6 OD for better highway rpm. Tom [/QUOTE]
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R-spec Tremec TR3550...?
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