1968 Tempest/GTO speedometer gear usage

Information supplied by George Pearson
1968 Tempest/GTO Speedometer Gear Usage Chart (Turbo 400)
Speedo Driven Gear Tire Size Speedometer Adapter      
Rear axle ratio Part No. Teeth Color G70 X 14 8.25 X 14 205R X 14 7.75 X 14 G77 X 14 Model Ratio Part No. Color Sleeve & seal assy. Trans code Drive gear teeth
2.56 9780628 35 PINK X   X   X         1362294 PT 18
2.78 1359272 38 BLUE X   X             1362294 PT 18
2.78 1359271 37 RED         X         1362294 PT 18
2.93 9780628 35 PINK X   X   X         1362294 XP 16
2.93 1362048 40 BLACK X   X             1362293 PT 18
2.93 1359273 39 BROWN         X         1362294 PT 18
3.23 1359273 39 BROWN X   X             1362294 PX 16
3.23 1359272 38 BLUE         X         1362294 PX 16
3.23 9780470 44 DK GREY X   X             1362293 PT 18
3.23 1362196 43 PURPLE         X         1362293 PT 18
3.36 1362195 41 YELLOW X   X             1362293 PX 16
3.36 1362048 40 BLACK         X         1362293 PX 16
3.55 1362196 43 PURPLE X   X             1362293 PX 16
3.55 1362049 42 GREEN         X         1362293 PX 16
3.90 1362195 41 YELLOW X   X     777-S .8653 535617 BLUE 1362293 PX 16
3.90 1359270 36 WHITE         X 777-S .7692 535615 YELLOW 1362294 PX 16
4.33 1362195 41 YELLOW X   X     777-S .7692 535615 YELLOW 1362293 PQ-PX 16
4.33 1362048 40 BLACK         X 777-S .7692 535615 YELLOW 1362293 PQ-PX 16
Information supplied by George Pearson, taken from a Pontiac Parts Book