Hi Tob, talked to you years ago, but lost your number. i need your input on two upper differential bushings i want to use. pn# br3z-5a638-b has a hard durometer, pn# dr3z-5a638-a which has a much harder durometer. i have a 2010 gt 500 and in the process of installing a Roush wheel hop kit.Thank you for your help in this mattery.
https://www.svtperformance.com/threads/new-market-rules.1100184/