3.55 with boost, it will redline fast as shit if you want to take it out on streets. Yeah you can go with 3.73 but I went from an aod with 4.10 to A T5 with 3.27 on my car for my application.
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Ryan
1990 Mustang GT (In Process)
1993 LX Coupe (Daily Driver, but just choose not to)
2005 Excursion (Big Pig)