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Old 02-29-2008, 08:49 AM
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Originally Posted by TurboGibbs
I haven't done any "real" launches but with my 275/55-20's that are 32" tall and occasional towing, my 5.13's are perfect. 1900 rpm @70mph. I do have 29" slicks for the track.
the 32" tall tire makes the difference. I run a 27" tall tire (275/50-17) & with the 4.56s it does about 2200 rpm @ 70mph. The 3.73s did 1600 rpm @ 70mph - way too low.
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Old 02-29-2008, 08:57 AM
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Originally Posted by SixSpeedSS
the 32" tall tire makes the difference. I run a 27" tall tire (275/50-17) & with the 4.56s it does about 2200 rpm @ 70mph. The 3.73s did 1600 rpm @ 70mph - way too low.
I had 3.73's when I first did the T56 swap. It was around 1200 rpm and 6th was almost worthless. I went to 4.30's and then settled on 5.13's
4.88's would have been ok if I didn't tow on occasions or if I had a big block like yours of course.
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Old 02-29-2008, 10:06 AM
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Hey Tod, Welcome to PT! Great group of knowledgeful (not even a word, i know lol) guys on here... glad youll be able to contribute to it
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Old 02-29-2008, 10:07 AM
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Originally Posted by TurboGibbs
I had 3.73's when I first did the T56 swap. It was around 1200 rpm and 6th was almost worthless. I went to 4.30's and then settled on 5.13's
4.88's would have been ok if I didn't tow on occasions or if I had a big block like yours of course.

The big block helps. I wish I could get 4.30s for the 9.5" rear. They'd be perfect.
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Old 02-29-2008, 10:30 AM
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Old 02-29-2008, 05:13 PM
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Welcome to the site! Killer truck!
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Old 02-29-2008, 09:59 PM
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Welcome to Performancetrucks.net
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