You could possibly have 3.73s. I have a rpm calc and I have to use gear ratio and trans ratios and I am not sure if 3rd gear is the same in the t-45 as is the t-5. If so you have 3.73s.
i dont have a t45 ....i no longer have the car in my signature, iam just to lazy to change it.... I have a 2003 Mustang GT now.... So its a TR3650 transmission, right? .... someone from another forum told me that its equivlent to a 4.10.
You most certain do not have stock gears. I also have a 2003 mustang gt and at 35 miles an hour I am at 2000 rpms. Thats usually when i switch from 3rd to 4th gear.
ok guys so today i put the car up and marked the drive shaft and the wheel... the drive shaft indeed turned alittle more the 4 times... so iam pretty happy... 4.10 ftwww