2008 Challenger 6.1 swap input

More importantly, there's a sensor required to determine the wheel speed and adjust engine operations accordingly, which is part of the rear axle assembly. You need to put a tone ring on the trans output shaft to create the signal, since you won't be using the rear. You should really contact Hot Wire Performance or one of the other vendors that specialize in these swaps so you can make sure you're getting all the factory pieces you need to make it work. Without some of the pieces, you could be looking at quite an extra chunk of change over and above the $5k.