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Old 06-30-2009, 03:40 PM   #1 (permalink)
Diabolic
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Join Date: Aug 2002
Location: Arlington, Tx
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My 4.56's are ordered

and will be installed on Thursday. I would really like to be able to get a couple track passes in on Friday. If my mph stays the same as before, I will cross the 1/8th in "D" at 4250 rpm vs now at 3750 and some change. This wil allow me to cross at 275 rwhp @ 4250 rpm instead of only getting 245 rwhp@3750 rpm as it sits now. This is comparing the rpm to my dyno graph, so real world numbers could vary. If I hate it, the shop said $175 to put it back. I hope I don't hate it. I will post results as soon as I go to the track and get back home. I wonder if I should break in the gears first and give it a week or several hundred miles. I've always just got on my vehicles after a gear swap.
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