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Old 03-31-2013, 09:53 PM   #1
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Another amazing gearing question!

Alright, so I'm wanting to go pick up a Ford 8.8 to put in my 93 2.5l on 33s. The one i found seems perfect.. disk brakes, limited slip, 31 splines, etc. The only problem is that the axle is geared 5.13. Now my question is this..would it be smarter/more cost effective to have both axles re-geared to 4.88(being the lowest i could gear the d30)? or should i try to find a d44 swap for the front and just re-gear that to 5.13 to match the rear?

I hope the question made sense..thanks to anyone that can help!

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Old 03-31-2013, 10:15 PM   #2
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I own the same rig, although still saving up for the 33's. I have gone over and over this axle swap in my head. All my TJ buddies and some XJ buddies are doing the 8.8. Personally, I have decided to go with a D44 for the rear, and keep the D30 for the front. If you are keeping the 2.5L, a front D44 and 8.8 in the rear are just overkill IMO. A front D44 swap in a YJ is not the easiest task. If you are set on the 8.8, it would def. be easier to just regear that. I too, am going to go with the 4.88's.

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Old 03-31-2013, 10:19 PM   #3
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5.13 is pretty steep for 33s. Would put you at almost 2900rpms in 5th 3400rpms in 4th at 65mph.

I would personally never run 4.88s in a d30. The pinion is way too small. a d44 would be a good fit but that is added cost. Either you have to convert the d44 to 5 x5.5 and convert the 8.8 to 5x5.5, or run 5 x4.5 to 6 lug adapters to match the d44, or some other combo.

I think the absolute easiest would be to find a 4.10 8.8 and run it till you can figure out what axles you want to run in the long run so you do not waste money on regearing back and forth.


And a d44 and 8.8 are not overkill for a 2.5l, not at all. Also considering a low pinion waggy d44 isnt anything special.


Just ask my buddy with a d60/14b and a 2.5l that broke a pass side 35spline stub and hub last weekend.
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Old 03-31-2013, 10:24 PM   #4
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I would think that would depend on your future plans for tire sizes and intended usage.
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Old 03-31-2013, 10:35 PM   #5
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Quote:
Originally Posted by Norcal_Chris View Post
5.13 is pretty steep for 33s. Would put you at almost 2900rpms in 5th 3400rpms in 4th at 65mph.

I would personally never run 4.88s in a d30. The pinion is way too small. a d44 would be a good fit but that is added cost. Either you have to convert the d44 to 5 x5.5 and convert the 8.8 to 5x5.5, or run 5 x4.5 to 6 lug adapters to match the d44, or some other combo.

I think the absolute easiest would be to find a 4.10 8.8 and run it till you can figure out what axles you want to run in the long run so you do not waste money on regearing back and forth.


And a d44 and 8.8 are not overkill for a 2.5l, not at all. Also considering a low pinion waggy d44 isnt anything special.


Just ask my buddy with a d60/14b and a 2.5l that broke a pass side 35spline stub and hub last weekend.
I don't plan on running anything bigger than 33s, I just found a good deal on an 8.8 and my d35 just makes me really nervous because I wheel pretty hard on it. My jeep drags as it is and I've read everywhere that the ideal ratio for 33s with a 2.5l is 4.88. What gear ratio would you recommend if i stayed d30?
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Yep.
She's my 4 banger.
She's great when she gets down in low range, hard to control when she gets going, and always in need of my money. But she's a jeep and that's why I love her.
Plus, she has nice headlights..
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Old 03-31-2013, 10:52 PM   #6
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Quote:
Originally Posted by GooKZiLLA View Post
I don't plan on running anything bigger than 33s, I just found a good deal on an 8.8 and my d35 just makes me really nervous because I wheel pretty hard on it. My jeep drags as it is and I've read everywhere that the ideal ratio for 33s with a 2.5l is 4.88. What gear ratio would you recommend if i stayed d30?
I personally wouldnt regear the d30.

I was geared 4.56 before. That was with 33s with an open diff. After breaking my d35 3 times I went and bought a 4.10 geared 8.8 and found a 4.10 geared d30. I am running them with no issues with 35s right now.

Is it slow, sure. Can i get to were i want to go, yep. Can i drive up in the hills to the rubicon, yep.

I figure with the way I wheel i want the strongest setup I can since the d30 is a dinky thing. I wanted the biggest pinion tooth count I could get and still have a decent ratio. Eventually the d30 will be replaced, but for right now, with the low gear ratio and d44 sized u joints i dont see too many failures happening, And i have been in some pretty tough spots.
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Old 03-31-2013, 11:29 PM   #7
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Quote:
Originally Posted by Norcal_Chris View Post

I personally wouldnt regear the d30.

I was geared 4.56 before. That was with 33s with an open diff. After breaking my d35 3 times I went and bought a 4.10 geared 8.8 and found a 4.10 geared d30. I am running them with no issues with 35s right now.

Is it slow, sure. Can i get to were i want to go, yep. Can i drive up in the hills to the rubicon, yep.

I figure with the way I wheel i want the strongest setup I can since the d30 is a dinky thing. I wanted the biggest pinion tooth count I could get and still have a decent ratio. Eventually the d30 will be replaced, but for right now, with the low gear ratio and d44 sized u joints i dont see too many failures happening, And i have been in some pretty tough spots.
Alright, alright I see what you're sayin. That actually makes a lot of sense. I guess ill keep saving the money and just pass up this 8.8 for now. Thanks for your input man!

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Yep.
She's my 4 banger.
She's great when she gets down in low range, hard to control when she gets going, and always in need of my money. But she's a jeep and that's why I love her.
Plus, she has nice headlights..
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