99 rearend in my 07C?

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I've been looking for a different rearend for my truck to get a better gear ratio. I currently have 3.23's and I found a rear from a 99 with 3.42's. My plan was to remove the disc brake stuff from the donor rear and put my drums on it.

I'm holding out for a 3.73 posi rear, but they are $$$$ and this one is a pretty good deal. No idea on the milage though, it was a fleet truck as it has some companies name on the door.

Anyone done this or know of something else that changed in the axle assemblys when they started putting drums back on in 04 or 05? I can get this complete axle from disc to disc for less than a set of gears and an install kit....


Thanks,
Paul