77 CJ Gearing - JeepForum.com
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post #1 of 8 Old 09-27-2020, 05:13 PM Thread Starter
NCop143
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77 CJ Gearing

Just picked up a 77 CJ with a 304 4 speed manual in it. It’s got 37’s and a twin stick transfer case. Haven’t gotten a chance yet to see what gears are in it but I’m planning to use it as a weekend cruiser, little to no off road use. What gear ratio would be optimal?

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post #2 of 8 Old 09-27-2020, 08:36 PM
turbogus
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Let's see some photos

The parts shop that stocks part for Skylab II will not have parts for our year/model of Jeep
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post #3 of 8 Old 09-28-2020, 08:08 AM
ADDZ71
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Before anyone could answer the first thing to help would be what size tires do you currently have and what size do you plan to use. Does it drive good as is? I don't think changing the axle ratios would be first on my list of improvements. Most likely the gear ratio is 3.54 as I believe that was the stock choice that year. I run 33" tires and have 3.54 gears in my 1979 with a 304. I like the drivability as is. I have a 4 speed T-18 that I drive normally as a 3 speed (start in 2nd gear) and it runs about 2300 rpm at highway speeds (55-65mph) if I push it to 65 mph it goes above 2500 rpm.
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post #4 of 8 Old 09-28-2020, 11:21 AM
Fourtrail
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Going to agree 3.54's and a v-8 seem to work well with 33" tires Have that setup in my 80 '5 and it has good pickup without running too high of an rpm at highway speeds

80 CJ-5, 74 CJ-6, 56 CJ-5
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post #5 of 8 Old 09-28-2020, 12:08 PM
CSP
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With 37s I would determine what gears it has and if the two are compatible before trying to determine what's optimal.

I have 5.13s and really like them, but my use is 98% off road only.
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post #6 of 8 Old 09-28-2020, 12:18 PM
4Low2G0
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With 37's and mostly a weekend cruiser, I would go with 4.56 or 4.88.

Whats over that next ridge?
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post #7 of 8 Old 09-28-2020, 12:55 PM
ADDZ71
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The font was covering the 37's in the original post. I agree you are going to want 4.56 or 4.88 to turn those.
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post #8 of 8 Old 09-28-2020, 08:28 PM
CSP
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www.grimmjeeper.com/gears.html instead of guessing
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