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[MomsSol]

Originally Posted by sol79 Ok, I had the recall done today and I read the parts invoice. It lists lubricant and the seal kit, that's it. I'm guessing they either forgot the additive (not likely, I'd probably know pretty quickly if it wasn't there!) or the recall doesn't require additive. Perhaps the mechanic only needed to top off the fluid? Is the differential drained and refilled during the procedure or is the fluid merely topped off?

Here is what Small Dealer posted with regard to this:

Does the fluid have to be changed? It is one of the areas of the recall and procedure that is unclear. The recall, as has past service information, talks about the importance of keeping the pinion bore free of fluid. Fluid that could give the perception of a repeat failure. It does not require, or list it, it as one of the steps in performing the seal replacement. The parts information lists the required fluid and additive, but the payment section makes no reference to it. But, it does go a one step beyond though and states "It may be necessary to drain some or all of the axle fluid...". It would appear it is up to the dealership or their tech, on what to do. With out further guidence from GM, or dealerships getting claims bounced for excessive parts allowances, my recommendation would be to request that the procedure be done with a full drain and refill.