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Originally Posted by 86TOYO2k17
AT can handle a lot more torque, can shift much faster than a human, and still be controlled to shift or hold gear however you want,
Any FD gear for MTs will work for ATs no different.
MT and AT have the same rear diff pre 17, post 17 MT switched to a 4.3gearing same pumpkin/lsd, which is also still a direct swap and is a much better option for FI Autos.
Final drive will not change your shift points / RPM drop after shifting. Your transmission gearing determines this not FD gearing.
A shorter (numerically higher) FD will provide more mechanical torque to the wheels at the expensive of a lower top speed per gear / rpm.
I tried 4.1, 4.56, and ultimately settled on 4.3. 4.56 was too short. 4th topped out at about 115 which came up way too quick and I always wanted a little more, as you fall on your face once you go into 5th. Also traction was much more of an issue with a 4.56 gear.
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I like that idea. I get to keep it OEM basically and can switch on trade in.
Basically all I would be doing is buying the Diffrential and fluids?