New Ram Level I 11" x 1 1/8" x 26 Spline 350HP Clutch Kit for 1999-04 Ford Mustang 4.6L GT. Clutch Kit used when installing an Aftermarket Tremec TKO 5 Speed Transmission or Aftermarket 26 Spline Input Shaft into a T-45 (1999-01) or TR-3650 (02/01-04) Ford Mustang 4.6L. This clutch is basically a Stock Design Entry Level Clutch, but, for a 4.6L Mustang with an Upgraded Transmission. Clutch Kit is NOT recommended for use with Drag Radials or Slicks. This Clutch is only recommended for use with Standard Street Tires.