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V6FBody Online's - Techbase

2nd Generation FAQ: Tranny, Drivetrain, Rearend

What rear ends were available for the Camaro's?
What rear ends were available for the Firebird?
How can I adjust my speedometer after swapping gears?

 
 
What rear ends were available for the Camaro's?

The following lists the ratios that were available (with O=open and P=posi):

 
    1970 1/2
       2.56p, 2.56o, 2.73p, 2.73o, 3.07o, 3.07p, 3.08p, 3.08o, 3.31o, 3.31p,
       3.36p, 3.36o, 3.55o, 3.55p, 3.73o, 3.73p, 4.10o
 
    1971
       2.73o, 3.08o, 3.08p, 3.36o, 3.36p, 3.42o, 3.55p
 
    1972
       2.73o, 3.08p, 3.08o, 3.36p, 3.36o, 3.42o, 3.55p
 
    1973
       2.73o, 3.08p, 3.08o, 3.36p, 3.36o, 3.42p, 3.42o, 3.55p
 
    1974
       2.73o, 3.08p, 3.08o, 3.36p, 3.36o, 3.42p, 3.42o, 3.55p
 
    1975
       2.56o, 2.56p, 2.73o, 2.73p, 3.08o, 3.08p, 3.42o, 3.42p
 
    1976
       2.73o, 2.73p, 3.08o, 3.08p
 
    1977
       2.56o, 2.56p, 2.73o, 2.73p, 3.08o, 3.08p
 
    1978
       2.41o, 2.41p, 2.73o, 2.73p, 3.08o, 3.08p, 3.23o, 3.23p, 3.42o, 3.42p,
       3.73o, 3.73p
 
    1979
       2.41, 2.73, 3.08, 3.42, 3.73
 
    1980
       2.41, 2.56, 2.73, 3.08, 3.42, 3.73
 
    1981
       2.41, 2.56, 2.73, 3.08, 3.23, 3.42, 3.73
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What rear ends were available for the Firebird?

The following lists the ratios that were available (with O=open and P=posi):

 
    1971
       2.73o (GZG), 2.73p (CAG), 3.08o (GXG), 3.08p (GYG), 3.42o (CKG),
       3.42p (CJG), 3.73p (CGG), 4.10p (CBG)
 
    1972
       2.73o (GZG), 2.73p (CAG), 3.08o (GXG), 3.08p (GYG), 3.42o (CKG),
       3.42p (CJG), 3.73p (CGG)
 
    1973
       2.73o (GZG), 2.73p (CAG), 3.08o (GXG), 3.08p (GYG), 3.42o (CLG),
       3.42p (CMG)
 
    1974
       2.73o (GZG), 2.73p (CAG), 3.08o (GXG), 3.08p (GYG), 3.42o (CLG),
       3.42p (CMG)
 
    1975
       2.56o (PGG), 2.56p (PTG), 2.73o (PAG), 2.73p (PUG), 3.08o (PCG),
       3.08p (PWG)
 
    1976
       2.41o (PJG), 2.41p (PSG), 2.73o (PAG), 2.73p (PUG), 3.08o (PCG),
       3.08p (PWG), 3.23p (LDG)
 
    1977
       2.41o (PJG), 2.41p (PSG), 2.56o (PHG), 2.56p (PTG), 3.08o (PCG),
       3.08p (PWG), 3.23o (PDG), 3.23p (PXG)
 
    1978
       2.41o (2PJG), 2.41p (2PSG), 2.56o (2PHG), 2.56p (2PTG), 3.08o (2PCG),
       3.08p (2PWG), 3.23o (2PDG), 3.23p (2PXG), 3.42o (2PEG), 3.42p (2PYG)
 
    1979
       2.41o (2PJG), 2.41p (2PSG), 2.56o (2PHG), 2.56p (2PTG), 3.08o (2PCG),
       3.08p (2PWG), 3.23o (2PDG), 3.23p (2PXG), 3.32p (2PPG), 3.42o (2PEG),
       3.42p (2PYG), 3.42p (2POG)
 
    1980
       2.41o (2PJG), 2.41p (2PSG), 2.41p (5PVG), 2.56o (2PHG), 2.56p (2PTG),
       3.08o (2PCG), 3.08p (2PWG), 3.23o (2PDG), 3.23p (2PXG), 3.32p (5PQG),
       3.42o (2PEG), 3.42p (2PYG), 3.42p (5PMG)
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How can I adjust my speedometer after swapping rear gears?

The changes to the speedo gears depend on what kind of speedo gears you have now. There are two gears in the tranny (on the output shaft) that drive the speedo. First, there is a gear mounted on the output shaft, called the speedo "drive" gear. Then, there is a second gear that is mounted as an extension to the speedo cable, called the speedo "driven" gear. The driven gear is extremely easy to replace. The drive gear is a little more of a hassle, but no big deal. You will have to remove the tail shaft section on the tranny as well as the driveshaft for the drive gear. To replace the driven gear, you just remove a single bolt and pull out the speedo cable with gear.

If the driven gear you have now is on the low portion of the range (i.e. a few teeth) it may be sufficient to just replace the driven gear. The driven gear for the TH350 come in sizes up to 25 teeth. That means your current gear has to have a maximum of 20 teeth for a 3.23 or 18 teeth for a 3.55 rear gear. If you already have more than that on your current driven gear, you will have to replace the drive gear.

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