That's a great find. You will need a fine spline front yoke to use it in your 58. You will also need to modify your shift levers somewhat as the later trans has a different side cover and shift arms. Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes 1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes 2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans 1947 Willys CJ2A w/F-Head engine