Awaiting E-Mail Confirmation
Join Date: Mar 2004
Location: North GA
If it was stated to be a '98 Mustang transmission then you bought the wrong transmission. A standard '98 Mustang has a 3.8 liter V6 which has the same bellhousing as a 302. What you need is a Mustang GT transmission.
Unless you are in a hurry, I would just sell it and try to find a 99up Mustang GT 4R70W. It's much better than the pre 99 4R70W.