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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