Tranny slips out of 5th and makes noise in 2nd & 3rd
 

Well for no reason today my transmission on my 93 started making a constant grinding noise in 2nd and 3rd. Also my car slips out of 5th gear every time. 1st and 4th gear seem to be fine. If i hold the shift lever in 5th it stays in gear. Also 5th doesn't make any constant noise. Just a grind sometimes when engaging it. My synchro only has around 10,000 miles on it by the way. Are all these gears related ? Is it the 5th gear synchro again?

you destroyed your 5th gear synchros
it happens when you screw up the 2-3 up shift