To install a short throw shifter on your third-generation Challenger you will need to remove the top of the center console to access the shift lever mounting point on the transmission. You will also want to make sure that the shifter is in neutral before removing the old shifter from the transmission; otherwise leaving the transmission in gear will make it hard to line up the new shifter correctly.
This job will be very time consuming and you will be dealing with a lot of small parts. It’s also a job that requires a clear mind free of any stress so you will want to set aside a couple of hours to avoid running into a situation where you are rushing and may lose parts or install the shifter wrong leaving yourself in a total mess.
Professional Help: This is one of those jobs where experience is key. The nature of the job requires a keen eye and a trained hand that is familiar with the systems. Professional shops deal with these types of upgrades every day and will have it turned around for you faster than you could book the appointment. There’s no shame in turning to professionals for help.
It’s not so much hooking the shifter up that makes it a major pain as it is getting to it in the first place. The Challenger has a lot of plastic trim that will need to be removed to access the shifter, and without the proper tools it’s very easy to break something. If you wind up cracking the trim and losing your head the shifter install will become much more aggravating and may drive you to walk away. It’s a minor job and there’s nothing wrong with letting the pros handle it.