I blew up a 60a 4 speed behind my a15 ,it always crunched into second gear if I revved it out

It crunched in second on day and chipped a tooth which then went through the rest of the gear set and locked the back wheels up in the process.

So I bought another one that had reverse gone and made a good one out off 2 ,cost me 40 bucks for the new box then 7 for gasket goo

Only time ive seen them pop is if you are rough when changing gears

Also are t50 yota boxes any good ,can it be.used behind an a series ,I've got one but dunno what its good for ,came out of an ae86