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post #1 of (permalink) Old 08-30-2002, 10:52 AM
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Gear Ratio

I have a 1983 Jeep CJ-5. I lifted the rear end and spun my wheel 1 full rotation and counted the drive shaft spin. It doesn't make sense. 1 tire rotation equaled 1 and 1/2 drive line rotations. Am I messing up or should I be doing something I am not. Thanks....
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post #2 of (permalink) Old 08-30-2002, 11:02 AM
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Re: Gear Ratio

1. Welcome to the forum.
2. Please complete your profile, it's a courtsey to other users and helps them to know what rig they are giving advice about and to whom.
3. You've got the basics down correctly.
4. Search is a great tool, and easy to learn. Don't take this as a slam!
5. Here's an answer to you queston using <a target="_blank" href=;Board=offroadjeepshort&a mp;Number=808732&amp;Search=true&amp;Forum=offroad jeepshort&amp;Words=Count%20Gear%20Ratio&amp;Match =And&amp;Searchpage=0&amp;Limit=25&amp;Old=1year&a mp;Main=808699>Finding Gear Ratios Using the Search Function</a>.
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post #3 of (permalink) Old 08-30-2002, 11:18 AM
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Re: Gear Ratio

Thanks I apologize for not finishing my profile. I had help getting to this forum. I will sit down and finish the profile and try and include some pics ...I did try the search and was comming up with some great tips and ideas but I was looking for is what the actual gear ratio is supposed to be for a stock 83 CJ-5. AMC 20. Thanks thoug for the help.
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post #4 of (permalink) Old 08-30-2002, 12:38 PM
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Re: Gear Ratio

I would be willing to bet that the problem that you had was because you only lifted one tire. With an open diff you need to spin the tire around two times for the drive shaft to run through its entire path. So take the number of turns you got and double it, that is your ratio
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post #5 of (permalink) Old 08-30-2002, 12:44 PM
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Re: Gear Ratio

The most accurate way is to pull the diff cover and count the ring gear and pinion gear teeth. Divide the number of ring gear teeth by the number of pinion teeth and you will have your ratio. Example:
45 ring gear teeth divided by 10 pinion teeth = 4.5 to 1 ratio.
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post #6 of (permalink) Old 08-31-2002, 07:36 PM
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Re: Gear Ratio

Look for the code on the rear axle, or the diff tag on the front. If not, then the spin method is OK, but it isn't very accurate. However, you probably have 3.07's as they were the common ratio that year.
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post #7 of (permalink) Old 09-01-2002, 10:42 AM
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Re: Gear Ratio

Unfortunately, 2.73 was a very common ratio during that time of manditory fleet fuel mileage rules.
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post #8 of (permalink) Old 09-02-2002, 01:07 AM
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Re: Gear Ratio

My '83 had the 2.73's. it might of helped with gas milage, but it was darn near impossible to drive with 33" tires
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