trans problems with gryphon

[fisherman]

I've had my gryphon for a couple of weeks now, enjoying it with no problems........ Until this morning. Now the truck makes a weird whining noise and will not shift into 3rd gear. 1-2 is fine, then when its time for third, the tranny slips bigtime. Like it goes into neutral, if you give it gas it just revs up, and sometimes it pounds into a gear with a harsh thud.

Did running my shift firmness at 14 destroy my transmission?? I havent been real hard on it. Just having fun with the new shifting patterns. Btw, I set 1-2 at 5700, 2-3 at 5500, and 3-4 at 5400 all with shift firmness at 14.