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The stock 10 bolt has been surprising me with the additional power. I myself would upgrade to the TrailBlazer 14 Bolt with the 4.10 gears already in it and you wont hurt it.
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http://www.leftcoast32.com
'07 Black TrailBlazer SS "MP122HH" MagnaCharger
'05 SSR 6 Speed 427 "MP122HH" MagnaCharger
Authorized MagnaCharger Dealer/Distributor
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