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· Banned
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5,787 Posts
unless you have done this before and have all the micrometers and special tools
do not try this at home,.,,,, ask me how i know,,,,,$$$$ money well spent having someone who does it for a living,,,, im just saying,,,,,:beer:
 

· VINTAGE MOTORHEAD
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4,105 Posts
X2 what Mike said. Building a rear up takes experience, tools and a patient careful tech.
 

· Supporting Member
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4,739 Posts
Easiest way to accomplish this is to find a Posi rear from a Monte Carlo SS. They came with 3.42 up until 86, then 3.73. They are a direct bolt-in. With the 3 speed trans you have, I would definitely not go above 3.42. I had 3.08 in mine, and swapped in the 3.42. It ran like it had a new engine in it, but hwy RPM's will be above 3000. With 3.73, hwy RPM's could approach 3500.
 
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