I paid $250 to have someone install my transmission (remanufactured from Vines) today only to find a hairline crack in the rear of the housing, near where the exhaust hanger attaches.

After all the money I paid in labor, I really, really don't want to pay to pull the transmission again. I figure I can either -

1 - pay to have/pull the transmission myself, ship back to vines, wait, get new one, do all over again

2 - find someone whom can weld aluminum and have them try to seal up the crack.

3 - use some transmission stopleak product. These are usually not recommended for automatic transmissions, but I can't see how it would hurt a manual gearbox.

I really need some advice on this, I'm so upset with this damn transmission I don't know what to think anymore. Needless to say, I'm pretty pissed at the build quality of Vines rebuilt transmissions.