Shift Bracket Lose

[Gravy]

Ok, first few rounds of questions i'll post this, this is not my car i'm working on, but my DSM knowledge is fairly deep.

1992 AWD GSX with LSD and ABS 6/4 combo with a 5 speed. 2.5 turbo back Custom Exauhst with Boost controler. Other then that, stock.

The problem i'm having with my buddies car is the bracket in the engine bay keeps coming lose after several attempts to tighten it. Has anyone else come by this problem? And if so, have you found a solution, or does anyone have one?

We've tried tightening the bolts down as tight as we can(even after the tranny was off) and they still work their way loose. There's nothing like having to limp home in second gear. I know welding is an option, but i'm not even going to touch on that one. Would throwing in a lock washer help any? Or would that not help at all.