4R70W in a 1988 Thunderbird. Shifter install. December 15, 2019, 08:27:41 AM So I wanted to make sure that i could keep the car stock looking on the interior and exterior. So know I am tackling the shifter. I tried to keep the stock shifter in the car but it was not working out well. My plan was to install a 99-04 Mustang shifter and make it sit well with the console and cover. Sounds easy but it takes some work. The 88 shifter mounts to a flat plate on the trans tunnel. A 2002 shifter mounts to the curvature of the Mustang floor. So since that was not working, off to the junk yard with a sawzall I went. I cut a big part of the floor out of a 2002 Mustang and started my modifications. The Thunderbird shifter plate on the floor was screwed in and seam sealed to the trans tunnel. After getting that part out, I cleaned up the area and started to make the 2002 part fit onto a 1988 part. With a lot of trimming, fitting screwing around and modifying the console, I was able to get it all to fit and play nice.