2015 gmc yukon danile 6.2 6 spd trans 4x4, ok here we go, friend had alight drip under truck shop said rear main, so she brought it to me and looked at it and yes rear seal and also possible by intake area, so removed trans and rear cover, cleaned and installed new seal and rubber o-ring type seal, silconed up and reinstalled, told her yes afm seal leaking also, she said no to thea ( oil pan upper and lower ok) put new oil cooler gasket on it and reassembled, add 8qts oil 0/20, new gm oil filter, start up and a knocking noise from motor( loud) turn off check oil ok recheck for any thing hitting ok, start up and oil pressure 40 that 30 than 25, light rev 45, check codes none. drive and noise got quiet, parked it let sit, later recheck and noise back. this time found after test drivep0131,p0171,p0324,p0300,u0101,u0401. checked no miss fire data, not sure what to do,? not the first time doing rear seal, just finished cad esclade last week same thing(reseal oilpan,cooler gasket gm filter) so I never seen this before so if any one seen or heard anything like this please let me know. just a quick thuoght, could the new gm filter be bad? worked for gm 30 = years dont remeber hearing this before , also 153,000 miles and she wants to trade in but wants to get best price no bad engine price lol.
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