SHELBY GT 350 Member
Joined: Jan 2011
Location: Central Massachusetts
For road track use the Torsen differential is supposed to be the hot setup. I guess it is a little "free-er" in corners without losing much ultimate traction. The stock differential is better for straight-line drag racing where ultimate traction is the goal.
Aluminum driveshaft would be a nice touch while you're at it. I have Shaftmasters which is simple and works fine, but did develop a vibration and had to go back to Shaftmasters for reballancing (after about 50K miles, can't complain too much). The ones with CV joints are said to be smoother, but can develop play in the CV joint.
USMC's S550 brake upgrade is definitely worth a look, if I had it to do over again I might go that route. But the 14" SVT GT500 Brembo kit (same through Vorschlag) is more than adequate and is what most of the road track guys use.
I'm sure you have read that setting up the rear gears is tricky . . . but probably not impossible if you know what you are doing.
I don't know about those other technical details
| 2010 GT coupe | Daily Driver with some Steeda and GT500 take-off stuff for the occasional track day