Bart does a lot of Mustang work. That means he has a lot of Mustang-specific tools. Maximum Motorsports makes a subframe bushing removal tool specific to that generation Mustang IRS, and it just happens to work here, too!
The rear bushing that attaches the subframe to the car bolts to the post (previously pictured) and connects to the chassis with four small bolts. We had to apply a little bit of heat with a MAP torch, and then the bushing removal tool was able to pull the bushing most of the way out of the housing.
Once you start using a torch, you should be extremely careful when touching anything, as it’s likely to be dangerously hot. Don’t guess. Wear protective gloves.
I did not use any solid bushings, and FIGS does not recommend them. Lots of people run to the solid bushing store #becauseracecar. The subframe is exposed to very high shock loads from all kinds of places, especially from the drivetrain. For high-powered torque-y drift cars where you are clutch kicking, the subframe and differential bushings provide some relief for these shock loads to go somewhere.
Did you ever wonder why drift cars tend to blow up axles or transmission input/output shafts? It’s because they have solid mounted everything, and the shock loads are transferred directly into these parts that were never designed to see them.
The polyurethane that Superpro uses for their bushings is extremely hard, but it’s not solid. Just that little bit of give drastically reduces shock loading and provides a longer life span for all of the components in the torque path: the transmission, the driveshaft, the differential, and the axles.
Think about it this way: Would you rather replace a poly bushing after a while, or replace a transmission because you blew up the input shaft?
The little tube contains grease. You will need to liberally apply it to the metal housing of the bushing. The washers go on either side of the bushing before attaching it to the subframe.
You could probably do it with the IRS bushing removal tool, but it would be a ghetto hack job. You could probably do a lot of sketchy things to get the bushing into the housing, but the press is the best tool to do the job safely and quickly.