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It would be the same rules with any tranny Chuck. The more splines you have on the input and output shafts the better. More splines = more area to take all the stress. It all depends on what kind of applications you're planning on using. I've never really messed with a toploader, but I know the differences between Tremec trannies. I think the regular 3650's and 3550's have 10 spline input shafts, while the TKO's have 26 splines. The TKO of course is rated for about 75-100 lb-ft more...
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