What are the best gears for my cj5 - JeepForum.com
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post #1 of 4 Old 02-24-2013, 09:42 AM Thread Starter
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Join Date: Feb 2013
Location: Huachuca City
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What are the best gears for my cj5

I am wondering what would be the best gear ratio for my 1981 cj5. Its a 4 cylinder with a 4 inch lift and 33's. It has a 5 speed transmission with a dana 300 transfer case. It currently has 3.73 gears. I would like to have a little power on the highway and be able to drive up hill faster than 40 mph. I am thinking of 4.56 or 4.88 gear ratio. Just wondering if anyone else has concurred this problem

Dabney25 is offline  
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post #2 of 4 Old 02-24-2013, 10:41 AM
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1984 CJ7 
Join Date: Apr 2009
Location: Arizona
Posts: 802
Welcome a fellow Arizonan!

You might want to fill out your profile, I'm guessing on a lot of your drivetrain.

With an 81 you shouldn't have a t5 but I'm going to assume that's what transmission your running. It has a .86 overdrive and I'm guessing your 33's are actually measured about 32 (might want to take a tape measure to them to find out)

Here's a good calculator for cruising rpm I'm not sure what the 4cyl power band is but doing 65 mph with 4.56 your looking at 2676 rpm and with 4.88 your looking at 2864

Also going any higher than 3.73s you'll need a new carrier for your Dana 30


Good luck!
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post #3 of 4 Old 02-24-2013, 11:11 AM
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1976 CJ7 
Join Date: Jun 2004
Location: 5&10
Posts: 291
With a 5 speed tranny 4.88

76 CJ7 6 cyl/t18/Dana 20
05 TJ HP30/8.8 with ARB's Rubicrawler Flatbelly Midarms/3" lift and 35s
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post #4 of 4 Old 02-24-2013, 08:43 PM Thread Starter
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Location: Huachuca City
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thanks for the help. i'm going to order the 4.88's.
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