The Ford Trac Loc? not a bad choice, they are fairly staright forward to rebuild and the clutch pack replacement isn't bad either. You can get the clutch kit from Ford Motorsports. I am thinking about a 3:73 upgrade to my Fox body, i have the stock 2:73s now and my launch off the line at the track is a challenge, however, plenty of top end on the highway, I like "flooring it " when the Nissans try to pass me at 80-90 MPH I like to make 'em work for it, most people back off before 100 MPH I dunno why. This is on the street Highway. Top end speed is about who backs off first.