Rear end gear ratio 84cj7 -
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post #1 of 3 Old 02-02-2005, 07:38 PM Thread Starter
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Question Rear end gear ratio 84cj7

I am rebuilding a 304 to replace my 258 in a 84 cj7. For chosing a cam I need to know the gear ratio. How can I figure this out? I was told to turn the tire and count the turns of the drive shaft. I tried it and at 3/4 turn of the tire, the driveshaft makes a full rotation.

Any other suggestions on building the engine are also appriciated.


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post #2 of 3 Old 02-02-2005, 08:55 PM
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Location: pensacola,fl
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Its probably a 2.73 you can tell from the stamping on the lower right side of the housing. Then check

83 cj7 all stock except lift and tires and all the drive train.
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post #3 of 3 Old 02-02-2005, 08:58 PM
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1971 CJ5 
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You need to match your cam more to application...IE low end torque, midrange power, high end HP, than to the gear ratio. Also, you need to insure the cam complements the intake/exhaust upgrades for it to work properly. Be sure you are honest with yourself when making this decision. Many people want to build the "killer high end HP motor", only to find that they almost never use it in that application, and arn't happy with the way it runs(or the amount of extra mods entailed in building it). As for the gear ratio, simply drop the cover and divide the ring gear tooth count by the pinion count. While you have it off, you can inspect the diff and replace the ? old gear oil.
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