It can be done as Dave stated. I always just take them apart as they generally need something anyway. It's probably a good time to check for wear on the syncro engagement ring and the shift forks. Common wear components.
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