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| What is axle ratio? http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=1&t=26910 |
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| Author: | stratamet [ Mon Nov 26, 2007 6:30 pm ] |
| Post subject: | What is axle ratio? |
Can anyone explain to me what axle ratio is and why 3.73 is apparently "better"? |
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| Author: | valvestem [ Mon Nov 26, 2007 7:02 pm ] |
| Post subject: | Re: What is axle ratio? |
stratamet wrote: Can anyone explain to me what axle ratio is and why 3.73 is apparently "better"?
The 3.73 refers to the final drive ratio of the rear axle gears, the drive shaft turns 3.73 turns to rotate the rear tire once. 3.73 is probably considered average for today's SUV with higher numbers being a lower ratio and lower numbers being a higher ratio. Many early Jeeps had ratios above 4, to get more torgue from the engine at low vehicle speed, but at the sacrifice of higher engine speeds on the highway. 3.73 is a compromise. |
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| Author: | KY Liberty [ Mon Nov 26, 2007 7:25 pm ] |
| Post subject: | |
What axle ratio is "better" is highly relative. It depends on what size tires you are running, and if your wanting more performance, or more economy. However, even at $3 per gallon, it's going to take a lot of gas to ever pay for a gear swap. If you go to taller tires, or get more power off the line, you would want to go to 4.10 gears which are the only lower gears available for the KJ. The stock 3.73 gears with 29" tires are on the side of better gas milage. 3.91 gears (not actually available for D30A front diff) would be right in the middle. And 4.11 gears (same thing as 4.10 gears) would be on the more power side. This chart will help. http://www.4lo.com/calc/geartable.htm |
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| Author: | DarbyWalters [ Mon Nov 26, 2007 8:18 pm ] |
| Post subject: | |
http://www.4lo.com/calc/geartable.htm Some info...not gospel but shows rpm vs tire size vs gear ratio |
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| Author: | Jeepjeepster [ Mon Nov 26, 2007 11:04 pm ] |
| Post subject: | |
3.71:1 means the pinion hear turns 3.7 times per one revolution of the ring gear. |
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