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Loud Screeching Noise on a Chevy Blazer

16 messages,  Last post on Jul 20, 2009 at 6:40 PM

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#14 of 16 Cast aluminum by duntov Jul 15, 2009 (6:59 am)
I forgot about it being a cast aluminum oil pan. GM started installing cast aluinum oil pans on 1995 and newer S10 Blazers. My 1991 S10 Blazer 4WD has the deep steel pan with a caged nut. I had to install a 1/2"-20 OS drain plug in the pan thanks to a technician at a oil change strip joint.   The 1995-up S10 Blazer aluminum pan requires a M12 x 1.75 drain plug and that plug with an oversize thread can be purchased on-line at CG Enterprizes ( www.cgenterprises.com ) which is their #1027 drain plug and #2201 gasket. A better option would be to install CG Enterprises #1048 M12 x 1.75 OS double (piggy-back) drain plug and a #2201 gasket. You can install the OS double drain plug with Loctite #262 permanent thread locker and never have to remove the M12 x 1.75 drain plug again. In order to drain the oil, you remove the smaller "piggy-back" drain plug that is threaded into the main M12 x 1.75 drain plug that you have permanently locked in the pan with the Loctite thread locker.   The very last option would be to replace the oil pan with a new one. Unfortunately, you must remove the engine to do that. The high cost of replacing a oil pan is why the OS drain plugs and the piggy-back drain plugs were invented and introduced.   "When the price of eggs get high enough, roosters will start laying"
#15 of 16 Loud Screeching Noise by wesx Jul 17, 2009 (2:33 pm)
Ok, today I went out and rechecked all the fluids. All of the fluids were full and looked clean. The radiator was a little low on fluid but thats it. The fluid leaking on the ground under the differential is a light gold color.   I also played around with the shifter some more and it only makes the loud noise when it's put in to or taken out of drive. It doesn't do it with park, reverse, neutral, 3, 2 or 1.   I also noticed that the check engine light was on. I ran the codes and it came back with a bad O2 sensor. I also think that the catalytic converter is bad.   Could the cat be the cause of the loud noise? Also, is replacing the cover for the differential difficult or is it just taking the bolts off and replacing the cover? Replies to this message: jlflemmons (Jul 20, 2009 6:40 pm)
#16 of 16 Re: Loud Screeching Noise [wesx] by jlflemmons Jul 20, 2009 (6:40 pm)
Replying to: wesx (Jul 17, 2009 2:33 pm) Differential cover is easy. Pull the old one, clean all the gasket material from the carrier. Apply Permatex Black per the instructions on the tube, and reassemble. Will take about 1 2/3 quarts of synthetic 80W90.   Regarding the noise, any chance a heat shield is coming in contact with the linkage when in the drive position? May need to put this one on a lift to isolate the location.   The typical noise from a bad cat is a marbles in coffee can sound, or a loud sucking/whooshing sound if plugged.   A vacuum leak can trigger a false O2 sensor code. Several mechie's have told me the O2 sensor is the most common mistakenly identified failure around.

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