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Old 04-29-2015, 09:54 AM
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What Gears for a 89 manual 4.2?

Has stock rear. want to do some off roading with my 33s but nothing insane. 3.55 or 3.73?

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Old 04-29-2015, 11:02 AM   #2
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Has stock rear. want to do some off roading with my 33s but nothing insane. 3.55 or 3.73?
Your stock gearing is 3.07 so for 33's you'll want 4.10's It'll be like driving with stock gearing and 225/75/15's



I'm running 35's and will be going to 4.56

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Old 04-29-2015, 01:15 PM
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Your stock gearing is 3.07 so for 33's you'll want 4.10's It'll be like driving with stock gearing and 225/75/15's



I'm running 35's and will be going to 4.56


Should I change the front also?
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Old 04-29-2015, 08:40 PM   #4
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Yes. The front gear ratio absolutely needs to match the rear. Bad things happen if they are different and you pull onto pavement in 4wd
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Old 04-29-2015, 10:01 PM
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ok thought so but figured i'd ask.
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Old 04-29-2015, 10:36 PM
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ok so front and back both 4.10? because i can only find 4.11 for the rear
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Old 04-30-2015, 11:42 AM   #7
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Jeeps with the 4cyl came with 4.10's stock. It might be worth looking into just swapping the whole axle assemblies from one if you can fine them.
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Old 04-30-2015, 02:01 PM
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Jeeps with the 4cyl came with 4.10's stock. It might be worth looking into just swapping the whole axle assemblies from one if you can fine them.
Well I'm not swapping out the axels right now. I just need to know what to get for the front and rear lol. I don't know enough about the gearing.
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Old 04-30-2015, 09:47 PM   #9
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Swapping out the whole axle assemblies would be less expensive than having someone install gears. It really isn't that big of a job and does not require any special tools or special skills like a gear change does.
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Old 05-01-2015, 12:17 AM
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Swapping out the whole axle assemblies would be less expensive than having someone install gears. It really isn't that big of a job and does not require any special tools or special skills like a gear change does.
I was going to install them myself. ThoughI probably could do that I suppose since I'm doing an SOA. Just didn't want to but I guess what does it matter? Okay should I just get 4 cyl axels or is there a better axle I should grab?
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Old 05-01-2015, 07:48 AM   #11
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If you are doing a rear axle swap look for a ford 8.8 out of a explorer.they bolt right in and you get rear discs in the deal.Exporers came with 3.73 and 4.10 both would be good with 33s.It all depends on your long term plans for the Jeep.A posi would be a good idea but hard to find in the junk yard.
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Old 05-01-2015, 09:56 AM
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ok, what about the front axle.
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Old 05-01-2015, 11:58 AM   #13
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The Dane 30 is a pretty good axle and typically holds up well up to 35" tires. Ideally, look for one out of a TJ or XJ so you can get rid of the CAD system. Both the TJ and XJ have 1 piece passenger side shafts.
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Old 05-01-2015, 01:45 PM
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lol whats the CAD system. I'm not dumb just not an expert. haha.
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Old 05-01-2015, 03:27 PM   #15
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Central Axle Disconnect - vaccuum actuated assembly that engages the front axle. They can be problematic.
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Old 05-01-2015, 06:37 PM
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Central Axle Disconnect - vaccuum actuated assembly that engages the front axle. They can be problematic.
Ok, so will the Dana 30 have compatible gears with the ford 8.8?
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Old 05-03-2015, 11:26 PM   #17
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Ok, so will the Dana 30 have compatible gears with the ford 8.8?
Yes it's a very popular swap with YJ and Tj crowd
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Old 05-04-2015, 02:59 PM
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ok, thanks for the follow up.
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Old 05-05-2015, 04:05 PM   #19
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Originally Posted by jimzamp View Post
If you are doing a rear axle swap look for a ford 8.8 out of a explorer.they bolt right in and you get rear discs in the deal.Exporers came with 3.73 and 4.10 both would be good with 33s.It all depends on your long term plans for the Jeep.A posi would be a good idea but hard to find in the junk yard.
The 8.8 is not a direct bolt in.
The spring perched and shock mounts have to be cut off and rewelded in the right locations. The pinion is different and you will need an adaptor. The same with the e-break cables. But you can buy a kit that has all those parts needed.
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Old 05-06-2015, 03:58 PM
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The 8.8 is not a direct bolt in.
The spring perched and shock mounts have to be cut off and rewelded in the right locations. The pinion is different and you will need an adaptor. The same with the e-break cables. But you can buy a kit that has all those parts needed.
Do you know where I can get the kit?
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Old 05-06-2015, 03:59 PM   #21
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Do you know where I can get the kit?
East coast gear supply
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Old 05-06-2015, 05:05 PM
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East coast gear supply
Thank you, sir.
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Old 05-06-2015, 06:32 PM
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The 8.8 is not a direct bolt in.
The spring perched and shock mounts have to be cut off and rewelded in the right locations. The pinion is different and you will need an adaptor. The same with the e-break cables. But you can buy a kit that has all those parts needed.
I need a pinion adapter? I don't see one on that site.

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