Rgomez1787

iTrader: (2)

I have a 99 LS1 with 178XXX(3rd owner. 2nd owner says the first owner rebuilt it) miles with an auto. I first thought it was a bad pulley because it sounds exactly like it but I checked all the pulleys and they are fine. The sound is coming from the rear of the motor. I have a bad rear main seal I have oil between the motor and tranny and also the oil pan idk if that's it?? I changed the oil and no sign of any metal shavings. The motor doesn't hesitate at idle or any RPM. The squeeling does go with the RPM. If it is a bad bearing do I need to get a new crank and main caps? Thanks in advanced.

500@10psi

iTrader: (5)

did you cut up the oil filter? if there is a bad bearing the crank will have to be checked by a machine shop. but you shouldnt need new caps (unless its really bad) just new bearings. the only way to really know is to pull the oil pan and take a look for yourself. rear seals are really easy to screw up so the first owner might have installed it wrong and i took this long to become noticable. hows your oil pressure?

RrCoX22

iTrader: (6)

squeeling shouldn't be associated with a bad bearing. more of a knock type sound since the clearance has increased.

Rgomez1787

iTrader: (2)

That's what I thought. My lt1 in my impala spun a bearing and you could hear the crank rattling inside. Which leads me to beleive it might be the rear main seal.

Rgomez1787

iTrader: (2)

Oil pressure is fine. I'll change the oil filter this weekend to see if there are any shavings when I cut it open.

RrCoX22

iTrader: (6)

if you have a magnet you can just stick that in and should come up with shavings or no. but doesn't sound like it's a bearing so far.

Rgomez1787

iTrader: (2)

Stick the magnet where in the oil filter?