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Additionally, if you would like to upgrade to billet shafts and 5 pinion planets (the only upgrades this doesn't have) it would be a good idea to do so when it's apart at Ace Racing.
No explanation with this, other than a part was defective when installed. It only had about 15,000 miles on it, and my 4.8 is STOCK other than a tune. Even the intake and exhaust is stock.