A855 - 5 Speed
Then tell him 'Try selling to it someone else who is aware of all the problems and is willing to take them on...' That's a whole other approach than 'sell it to some sucker'.
Manual gearboxes have been made for a hundred years. There's no good reason it should be popping out of gear - and even more, there's no good reason 'they' can't resolve it. What's really being exposed is a common aftermarket malady .... guys who set out to make a 'bad-***' part without first getting the basics worked out. The aftermarket makes some very nice products about half the time, and the other half is stuff that is shiny and sexy but falls short. Clearly, whoever made this gearbox bit off more than they could chew.
That wouldn't bother me so much if the aftermarket guys were a little less full of swagger but it seems like far too many think bragging about their stuff is Priority #1. The best guys are the ones who do their best then stand behind their product to the end.
I feel sorry for the OP.....and what's more, if I had to work lying on my back under jack stands, I wouldn't do it. The OP woulda been better off spending his $6K on a good lift and trans jack. There is an age - 30 years old - at which no one should put up with floor jacks and jack stands.