Driveline Options for the 1972 GTO

The following list contains the standard and optional driveline options for the 1972 GTO. The bold text for each option is used in the Top Speed Calculator. If your car is modified, use the closest match. You'll have a chance to make changes in the Top Speed Calculator page.

Select Engine for the Max RPM: (net Hp values)

Standard 250hp (400cu in, V8, 1-4bbl, 250Hp, 4400RPM at Max Hp)
Optional 455cu in (455cu in, V8, 1-4bbl, 250Hp, 3700RPM at Max Hp)
Optional 455-HO (455cu in, V8, 1-4bbl, 300Hp, 4000RPM at Max Hp)

Select Transmission for the Gear Ratios:

Standard 3-Spd Man Floor Shift (1st 2.85:1, 2nd 1.68:1, 3rd 1.00:1, rev 2.95:1)
Optional 4-Spd Man Floor Shift M20 (1st 2.52:1, 2nd 1.88:1, 3rd 1.46:1, 4th 1.00:1, rev 2.59:1)
Optional 4-Spd Man Close-Ratio Floor Shift M22 (1st 2.20:1, 2nd 1.64:1, 3rd 1.28:1, 4th 1.00:1, rev 2.27:1)
Optional 3-Spd Auto Floor Shift (1st 2.48:1, 2nd 1.48:1, 3rd 1.00:1, rev 2.08:1)

Select Rear Axle Ratio:

  Engine   Trans  
3.07		  
3.08		  
3.23		  
3.31		  
3.55
  Std 250hp   3-Man   .   .   Opt   .   Std
      3-Man w air   .   .   Std   .   .
      4-Man   .   .   Opt   .   Std
      4-Man w air   .   .   Std   .   .
      4-Man Close   .   .   .   .   Std
      3-Auto   .   Opt   .   .   Std
      3-Auto w air   .   .   Std   .   .
  455cu in   3-Auto   .   Opt   .   .   Std
      3-Auto w air   .   Opt   Std   .   .
  455-HO   4-Man Close   .   .   .   .   Std
      4-Man Close w air   .   .   .   Std   .
      3-Auto   .   .   .   .   Std
      3-Auto w air   Std   .   .   .   .

Select Tire Size:

Standard 14 inch rim G70x14 (P225 / 70R14)
Optional 15 inch rim G60x15 (P215 / 60R15)