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Discussion Starter · #1 ·
Right now I have a pretty faulty, what I believe to be original, 3-speed cruise-o-matic auto transmission on my 66 mustang. I plan on putting in a 5 or 6-speed manual. How much quickness or HP change can I expect?
 

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There will be no increase in HP, as there are no changes to the motor.
 
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