I'd play around with it a bit and see if you can cure your problem. Did you assemble the transmission yourself? The reason I ask is if you can't cure your jumping out of gear problem by adjusting your spring pressure, then it's likely that you have some worn gear teeth. If it jumps out of gear in first or second then it's likely gear tooth wear. If the problem is in a higher gear then it's due to gear dog wear. Again, good luck with adjusting! I know that the last thing you want to do now is tear into the tranny!