I know there are two different tranny's in an 01 Mustang...how do I know which tranny I have in my 01?

 

a search would of produced this

here ya go


The Mustang GT in 2001 had both the T5/T-45 and 3650 Transmissions. Check your driver's door for a sticker and look under "TR" for a "K". If you have a "K" then you have the 3650 Transmission