4.6L General DiscussionThis section is for non-tech specific information pertaining to 4.6L (Modular) Mustangs built from 1996 to 2004.
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Ok so i have the t45 with 3.27 gears and 580rwtq but the stock trans crapped out so i need to upgrade. Switching from 4th to 5th gear with the t45 the rpms drop a lot my question is if i were to get a t-56 would there still be a big jump from 4th to 5th? also having 3.27 gears would i even benefit from a six speed transmission? not set on t-56 just would like to know what would be best for my setup. any info is appreciated.
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well...idk the 6spd i know is easier to bang it into 5th to keep the rpms up, but either way 5th is in a another H pattern so to speak, so ur gon alose a few rpms compared to the 1-4 gear bangin, but wont be as bad, because i too lose osme serious rpms in my t-45...and i would go witht he 6spd as well becuase you can add a steeper gear and still have the roms to cruise on the highway with the double OD
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well if you dont the like the big jump to 5th from 4th in the T-45, the T-56 will be what you want. The final gear ratio is the same(or so close you cant tell the difference) as the T-45, unless you get the Viper spec T-56. Basically the T-56 is the same as the T-45 with the exception of a extra gear that is placed in between the T-45's 4th and 5th gears. The T-56's 1st gear is taller though i believe. I wanna say the end gear ratio of the regular T-56 is like a .62 where as the viper spec is a .50 i believe.
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