the biggest bottle necks in your stock sytem are the heads, and exhaust.
Do the exhaust unless you got cash for heads.
But get tires and a gear first.
Look in your door panel on the tag.....ax code.....m=2.73.....z=3.08.......e=3.27(AOD only)
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4.10's,long tubes & 75 shot...Goes 12.50's
Check it out at
http://www.burnouts.webprovider.com