If you're dumb enough to run a bolt thru the pump and into the case; then you'll booger up the case hole and raise the aluminum around it; causing the pump to not seat completely against the case; causing an internal pressure leak. But don't take my word for it...I'm probably lying...And if you'd rather write a check than do it yourself then what the hell are you doing on this thread?? And how do you expect to install the guts into that trans on an engine stand? I'd love to watch the cockamamie video of that!