Noise Under Load and Vibration From Engine

[torxxx]

Its most likely a lego 5 speed so it was probably the main input bearing. Thats the first one to go on those, then the second main bearing goes. its amazing these those transmissions still operate for how messed up they can get. I've torn down a few lego trans that were so ground up, the case wasnt even reuseable

I'm think my 92 is having that check valve issue also, I'm going to check it tommorow at work. at 2k to 4kish I can hear a squeal like a vacumn leak. it goes away after midrange rpms. And it also has massive hesistation until about 3800 rpms.