alright so i just traded my crx with dohc zc for this guys 91 hatch with ls motor, and i have some questions.

first he said it had lsd, and i dont really know what that looks like, but how could i check if it really did?

second the car shakes mad when running! he told me he had a metal peice welded to the front of the transmission and then to the core support i believe, to reduce the engine movement which makes better response? could that be why it shakes ?

what year is the motor made in..? i know its 90-93 but how could i tell?

he said its 'j spec', whats the difference between this and jdm, or how do i tell if its usdm or not, cause i dont knwo if he was lying.

also, when i drive i hear this horrid screaching from my passanger side wheel, and slowly speeds up as i increase speed, sort of a clicking squeeling, and when i slow down it gets louder, softer as i drive faster. i saw the outer cv boot was ripped, but would that make it squeel? maybe a wheel bearing? how do i replace that?

lastly, i need a diagram or pictures of how to set up the vacuum lines. ther are a few that dont go anywhere or that are plugged, and i want to know where they go.

ANY HELP please, thanks!