Wrong, the synchros are bad, this is very common in Mustangs, you need a basic rebuild. Do it soon, the more you drive it like that the more damge you will do to the transmission and it will be more expensive to fix if they have to replace any gears.
Briane
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Red 93 GT with only 9000 original miles on it.
HP Performance Stage 1 Street kit with 60mm turbo
Car Pics
11.29 @ 126 mph 16 psi
16 lbs of boost 509 rwhp/626 rwtq
12 lbs of boost 433 rwhp/571 rwtq
********STOCK MOTOR*******