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Message: <blockquote data-quote="OLD H2S" data-source="post: 1447053" data-attributes="member: 20979">Buy it new?  The 2R comes in the new Mustang and the 3R has a higher multiplier in it and really digs hard out of the corners.  I did the 3R in mine and converted to rear air bags to adjust for the squat easier, the rear coil overs were too much of a pain to keep upping the spring rate and then have to change to fronts to match and made the whole set up too hard for the street.I like the unit and it is quite and smooth but I had the car set for racing and now have gone back to street and the 3R  hooks hard when I punch it. Your IRS could be a better set up? But your going to have to check your ride height because there could be rubbing when you get the suspension wrapped up under power.  The set up is for NO wheel spin and Torson says not to do drag starts or burnouts so plan accordingly, it will put a lot of strain on the power train with high HP and I have had to reshim the rear end to keep it tight. I should switch to the Ford heavy duty diff. bearing set up. Install is easy and now is the time to change the ratio if you want, save the old crush spacer and have a solid one made, they are cheap and strong and keep the pinion tight under big power.</blockquote>