What are you accustomed to driving?
Transmission might be perfect but your expectations or technique may need adjusting.
My GMC for example shifts nicely, but not nearly as quickly as my VW.

If you match speeds by giving it just the right amount of throttle while passing neutral on the down shift it’ll shift easier, and make shifting possible if the synchronizers are worn. If they’re plumb worn out you can still shift by letting the clutch up in neutral, match speeds, clutch again and complete the gear change, it’s called “double clutching”.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-