I have a Detroit in my Jeep, and I definitely wouldn't want it in my mostly street driven 'Stang. Sudden accelleration/decelleration will tend to pitch you different directions. I spent the $75 and rebuilt my Trak-Lok using the alternating clutch pack method and it's really tight anyway.
------------------
86 GT, GT40P heads, Crane 2031, 1.7 RR's, Cobra intake, 65mm TB, 73mm Vortech, 24# injectors, MAC GT40P headers, 2-1/2" BBK H-pipe (w/cats), Flowmasters, 3.55s, Groundpounder subs and lower control arms, 277 RWHP.
www.mustangworks.com/cgi-bin/moi-display.cgi?1537