For 1991 & later 3.0L 4-cyl, 115-140 Hp | 4.3L V6, 155-175 Hp | 5.0-5.7L 180-230 Hp Alpha One, Alpha Gen II & Bravo upper gearcases.

also crosses with:
Sierra: 18-2324
GLM: 11131
Mallory: 9-72462