FUEL PUMP AND REAR MAIN LEAKS!!!!
I've owned several '89 2500's, and my father in law just bought one a few months ago.
Every one i've ever encountered had a rear main seal leak about 100,000 miles, and the fuel pumps (which are in the gas tank) like to give up the ghost anytime after 80,000 miles.
Other than those two issues, those trucks are good looking, and built rock solid.. i know of one with over 300,000 on the clock and still purrs like a kitten.
As for the rear seal leak, if it aint that bad, dump a can of that stop leak stuff in there every now and then.. works like a charm.
As far as towing, the '89 2500 my father in law has pulls a 5th wheel stock trailer with 9 to 12 head in it without missing a beat.. and i'm not talking calves.. i'm talking 900+ lbs steers. Up thru the wildcat hills and you wouldn't know anything was even on the back.
