Yes, If it is the stock 3 speed transmission it is full Syncro.
It can be identified by the 7 bolt side cover. It also has a fine spline output shaft. You will need to modify the shift arms and find a fine spline yoke to use it in your 58.
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