Never done a Yukon. But it seems that would be easier than an F body. Id say around $250-$300 would be more reasonable. I think some of the problem may be that the stock pumps are actually a bit pricey.
You should call a dealership and see what they run. That way youll know what they are talking about for labor.
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if it's cheap & reliable, it ain't fast, if it's fast & cheap, it ain't reliable, if it's fast & reliable, it ain't cheap
