Sorry guys! the website froze and gave me an SQL Error of some sort and double posted. can't figure out how to delete one of them!!

Apparently Ultra Tune stuffed the threading for the Gearbox Oil NUT.. i've seen it. they held it in with silicon the bastards. Carl from Patterson Lakes CRS Automotive put Liquid Metal in its place to hold it in alot more secure. I'm under the impression that i need to get the gearbox oil topped up / changed for clunky noises and hard to select gears. How can i go about getting it fixed? do i need to buy another gearbox? or can i do a temporary fix to rethread it and use a larger nut?