Hey guys any of you ever ran none syn. 85w90 in a auburn style rearend? I just did a fresh rebuild on mine and put RP 75w90 syn. w/additive and it was whining(i guess it was 2 thin). So pulled the rearend again and rechecked everything, it was perfect. So this time i put straight 85w90 and it is quite as a mouse. I went back and added the additive cause the clutches were chattering when turning, but now it is perfect. Is there any long term affects of this?
BTW the paper work that came with the gears said to use 85w90.
__________________ Previous LSX Automobiles: 1999 C5 Corvette, 1999 SS Camaro, 1998 WS6 Trans Am, 1998 B4C Camaro, 2002 Z28 Camaro, 2007 Grand Prix GXP, 2006 Silverado Z71, 2006 Sierra Z71, Current: 2004 Tahoe Z71