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It may not be apparent right away but may cause issues later on. The Limited Slip Differential contains clutches. They require oil with an additive that allows the clutches to operate correctly. Check the container that the oil came in, it should say Limited Slip/ Posi-trac compatible. It may be in small print on the back of the bottle. If it doesn't, you ...


You need to find the RPO (Regular Production Options) list on the Service Parts Identification label. Similar to what is pictured below. It will likely be on the spare tire cover or the glove box, but may also be in the door jam or under some other compartment lid. Each on of those three digit number/letters indicates an option the car is equipped with on ...


If you have any doubt at all that the RPO code sticker is accurate (like, maybe someone swapped the rear differential), you can tell an ordinary open diff from an LSD by jacking up the rear end of the car, releasing the parking brake, and turning each rear wheel in turn, leaving the other one free to turn by itself. With an open differential, the opposite ...


As Larry said, look for the RPO codes. The code you are looking for the Limited Slip option is G80. Look here for a list of RPO codes specific to your CTS.

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