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| Rear Axle Ratio, How can I tell? https://slantsix.org/forum/viewtopic.php?t=14720 |
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| Author: | bwhitejr [ Mon Oct 17, 2005 8:28 am ] |
| Post subject: | Rear Axle Ratio, How can I tell? |
I jacked the rear up on the Ramcharger thinking I could get my rear axle ratio figured out by turning my whell and couting the revolutions on my driveline. I ended up with 1 wheel revolution = 1 3/4 driveshaft revolution. That doesn't seem to work for any realistic ratios I have seen. How can I figure this out without pulling the cover and counting teeth. It is an 8 1/4" Thanks, bwhitejr |
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| Author: | Dennis Weaver [ Mon Oct 17, 2005 8:47 am ] |
| Post subject: | |
..sure it does. You've got a 3.55:1 You need to turn the wheel twice on an open rear with the opposite wheel held in place - or you can simply multiply *2 D/W |
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| Author: | SlantSixDan [ Mon Oct 17, 2005 9:00 am ] |
| Post subject: | |
Jack up one rear wheel. Mark the tire. If you have an open rear axle, turn the tire [two] complete revolutions (Sure Grip: Just one) while watching the driveshaft and counting 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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| Author: | bwhitejr [ Mon Oct 17, 2005 9:00 am ] |
| Post subject: | Rear Axle Ratio, How can I tell? |
I know that is correct, because I have the build sheet for the vehicle, but why would I multiply by two? |
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| Author: | bwhitejr [ Mon Oct 17, 2005 9:39 am ] |
| Post subject: | Rear Axle Ratio, How can I tell? |
On my son's I get: 1 wheel revolution = 1 1/2 drive shaft revolution. The closest ratio to this that I can find is 3.07:1. Is this correct? |
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| Author: | SlantSixDan [ Mon Oct 17, 2005 9:43 am ] |
| Post subject: | Re: Rear Axle Ratio, How can I tell? |
Quote: On my son's I get:
No, it is not; there's no such ratio as 3.07.1 wheel revolution = 1 1/2 drive shaft revolution. The closest ratio to this that I can find is 3.07:1. Is this correct? Again: Rotate the wheel through two revolutions. |
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| Author: | emsvitil [ Mon Oct 17, 2005 2:23 pm ] |
| Post subject: | Re: Rear Axle Ratio, How can I tell? |
Quote: I know that is correct, because I have the build sheet for the vehicle, but why would I multiply by two?
Because the opposite wheel isn't turning.Due to the differential, if one wheel isn't turning, the other wheel rotates twice as much........ Note: with a sure-grip, you'll need both wheels off the ground, and both wheels will turn together. |
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| Author: | Dennis Weaver [ Mon Oct 17, 2005 3:49 pm ] |
| Post subject: | Re: Rear Axle Ratio, How can I tell? |
Quote: Due to the differential, if one wheel isn't turning, the other wheel rotates twice as much........
THANK YOU! Very succinct way to put it. I think there ought to be a "fundamental basic FAQ" section here to answer these kinds of things.D/W |
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