i was looking at the trannys that you posted. i thought that everything else being equal i think that your first gear ratio being higher would help you off the line and in each gear. its kinda like adding to your 4.10's and making them a little better. i looked for the ratios but couldnt fine one from tci i think. the summit one listed the first gear. if the tci is a higher number for first then i would go with that. i will give you a little more torque out of first and off the line. my .02 cents
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66 mustang-292-Holley 4160-World Castings Windsor Sr.-Hooker super comp headers-MSD box & Coil.3.55 gears. B&M Z-Gate-Black leather racing seats with 4pt harnes.
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