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Old 07-16-2006, 02:45 PM   #1
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gearing ?

is there a different gearing in the axles between a 2.5 and a 4.0? because if i was to do a axle swap from a 4.0 to a 2.5 i was wondering if i would have to change the gears out. thanks

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Old 07-16-2006, 04:33 PM   #2
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Yes there is a difference the 2.5 has less power so the stock gearing is lower on those axles. (higher in number lower in ratio).

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89 YJ Nearly Stock Dual D30's front and rear
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Old 07-16-2006, 08:38 PM   #3
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the gearing for the 4 cylinder is different than the 6
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Old 07-16-2006, 09:02 PM   #4
coilovers are damn flexy
 
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I would not worry about an axle swap, unless you are going beefier........such as a D44, or 8.8, or a 9". But you will definitely want to match the gears, front and rear, anyway you go. It is not a big thing at all, but if you have to regear, I would also put in lockers while you have it open.
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Old 07-17-2006, 11:02 PM   #5
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the reason i was going to have to do a axle swap is the jeep i bot was hit on the driver front fender and bent the top knuckle of the axle in and broke the leaf spring. i was debating an axle swap, but the axle i found would cost to much to put in. so what i did, finished this morning, was just heat up the knuckle and bend it out. this is temporary fix tell i can get some more money and do a rebuild on it. its not the prettiest jeep in the world but it gets the job done .

also i have a question about if i was to get a dana 30 from a cj, would it bolt right in or not, because i like the front axle to have the locking hubs on them and i didnt know if these axles would fit on the yj or not.
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Old 07-18-2006, 07:47 AM   #6
coilovers are damn flexy
 
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The axles from a CJ are about 4"-6" narrower than your YJ. I would not do it.
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Old 07-18-2006, 10:49 AM   #7
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yeah...hard for the tires to stick past the fenders at all...i've seen cj's with tires over 14.50 wide and at least 15x10 wide rims and they still just barely stick out past the fender if at all...while on a yj, a 12.50 with a 15x10 rim will stick out a lot...my buddy has that setup and it sticks out a ton...lol sorry about getting off track
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Old 07-18-2006, 05:07 PM   #8
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Small point! CJ's are passenger side drop????
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89 YJ Nearly Stock Dual D30's front and rear
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Old 07-18-2006, 05:57 PM   #9
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thanks guys. so to beef up my front axle the best thing to do is put in a manuel locker to replace the vacum one on the right side of the axle and put new axle shafts in w/ of course gears and a locker?
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Old 07-19-2006, 10:38 AM   #10
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Your 2.5 most likey has 4.11 gears most 4.0L came with 3.07's (auto) or 3.73's and some with 3.55's. the axles's housing tubes etc are the same other than the gears. So to upgrade your front 30, you can get rid of the two section axle on the passenger side and get rid of the vacum thingy. Also upgrading to 27x or what ever the new dana 30 u-joint is will help too. Keep in mind with a full time locker upfront there are some negatives. Driving on snow covered roads sucks, with it locked. Also in some tight turns it will sound as if your front end is going to rip appart, this of course is normal. Other than that you will not know its there.

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