I have a ap1 with 94,000 miles when I shift into 2nd gear 2/10 times it grinds then pops in would this be a gear giving out or clutch going out only does it going into 2nd at high rpms racing ..... Would like to fix right away

 

I'd guess that's a second gear synchro especially if it's only at high rpm and second gear.

 

should i just replace that gear or redo them all or just upgrade up to a ap2 tranz?