my '89 YJ (vin T) is finally leaking oil from the rear main seal at an undrivable rate. i have been told by many that it is worth the extra money to buy the rear main seal and a 1 piece oil pan gasket from the dealer so monday i will be picking it up. i have also been told that on a high milage engine, it is good practice to replace the oil pump with a high volume one. i have never replaced an oil pump before and was looking for some guidance or a link to a step by step removal/install. if someone could also tell me everything i might need that would be fantastic(ie screen assembly, pump, screen tool?). someone reccomended the "melling" high volume oil pump from quadratec and a new screen assembly? i have also even heard you should weld the screen assembly tube to the pump...i am a full time tig welder so thats not very difficult, but is it neccesary?

any input would be much appreciated.