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I need to add some power steering fluid in my '09 Silverado CC Z71 4x4 (5.3L, 6-speed, 3.42 gears) and have always been meticulous in following the owner's manual on service intervals/GM parts. Owner's manual says to use GM power steering fluid, GM Part #89021184. Local GM dealer can't find that part number in their computer. They have some quarts of GM PS fluid that have been on their shelf for years (bottles all dusty) with a different GM part number and they that fluid is fluid. Now, I know in the old days ATF was often substituted for PS fluid. But GM trucks have changed from recirculating ball to rack-and-pinion steering since then, so I'm thinking that's why they have different bottles/part numbers. Can anyone tell me what the current correct GM part number for the proper power steering fluid is? Or an aftermarket fluid that is an acceptable substitute?
