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| Determining Rear end Gearing by Rotating Wheel https://slantsix.org/forum/viewtopic.php?t=12780 |
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| Author: | killin5 [ Tue Apr 26, 2005 1:14 pm ] |
| Post subject: | Determining Rear end Gearing by Rotating Wheel |
While I had my valiant up on the jack stands last week I tried to determine the gear ration by rotating the rear wheel. I ended up getting right at about 1 ½ turns of the drive shaft for 1 rotation of the wheel. Is there a conversion chart for doing this. I was expecting the drive shaft to turn a few more times. This is using a 7 ¼ rear on a 63 valiant. Thanks, John |
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| Author: | Guest [ Tue Apr 26, 2005 1:50 pm ] |
| Post subject: | |
If its not a Sure Grip or posi diff then I believe you double the turns at the shaft for every rotation of the wheel assuming both wheels are off the ground. You likely have a 2.76:1 ratio. I think if you put one wheel on the ground to keep it from turning you will get the full ratio. Someone can correct me if I'm wrong. |
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| Author: | Dennis Weaver [ Tue Apr 26, 2005 2:20 pm ] |
| Post subject: | |
Open rear: Jack up one rear wheel. Mark tire. Turn (2) revolutions whilst counting driveshaft revolutions. A chalk mark on driveshaft or pinion helps. "Sure Grip": Jack up both rear wheels. Mark tire. Turn (1) revolution whilst counting driveshaft revolutions. D/W |
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| Author: | SlantSixDan [ Tue Apr 26, 2005 2:26 pm ] |
| Post subject: | |
Quote: Open rear: Jack up one rear wheel. Mark tire. Turn (2) revolutions whilst counting driveshaft revolutions. A chalk mark on driveshaft or pinion helps.
I find it easiest to count U-joint caps. There are four of them per revolution, so I just count the number of U-joint caps that face the ground over the course of two (open) one (suregrip) tire revolution, then divide by four, thus:16/4 = 4 = 3.91 14/4 = 3-1/2 = 3.54 or 3.55 13/4 = 3-1/4 = 3.21 or 3.23 12/4 = 3 = 2.93 or 2.94 11/4 = 2-3/4 = 2.71 or 2.76 10/4 = 2-1/2 = 2.45 9/4 = 2-1/4 = 2.26 |
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