need some info :( ......... ok, my water pump is bad on my 90 ls400 w/a v8. i went to the local parts store and got one. there seems to be a few differences in them. the new pump has a smooth pully and mine has a ribed one. it also looks to be shorter from the engine to the rad. i was just wondering if they used 2 diff water pumps? the part no. for the new pump is WP 9404