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Old 08-07-2010, 08:52 AM
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rear end swap

Hi All,Whats involved in a rear end swap for a 81 trans am,currently have 2.56 gearing want to upgrade to either 3.08 or 3.42 gearing,have found complete rear end from a 77 camaro with rear drums as mine also,stil have to check gear ratio on it.Thanks all

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Old 08-07-2010, 09:32 AM
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Why not just change the gear set in your current rear end? Its easier and in the end probably cheaper.
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Old 08-07-2010, 09:45 AM
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The rear end from any '71 to '81 Camaro or Firebird will fit, but the u joint might be different. The early rear ends used the 1310 u joint and the later ones used the 3R, which is what you have. The location of the rubber brake hose also changed somewhere in the mid '70s. Changing the complete rear end is easier for most people who have no experience with setting the pinion depth, bearing preload and backlash.
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Old 08-07-2010, 03:48 PM
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The 2.56 is a 2-series carrier, to put in 2.73-up gears, a 3-series carrier (2.73-up ratio) is needed, unless a spacer is used.
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