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Old 01-11-2016, 05:04 PM
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Axle swap and regear.

I posted my plans in the general discussion, decided to bring them here to get a local viewpoint. Also pose a couple questions.

My TJ is a 97 with 4.0l, 5spd, 33" Duratracs, 4"SL, SYE, upper and lower adjustable control arms front and rear, D35/30, and 3.55 gears.

After almost a year ,of research and asking questions, I've finally decided to do the Ford 8.8 swap. Also re-gear to 4.56.

SFF Customs out of Parker will be doing the work. I've not been able to find much info online about this Shop. Anyone have any experience with them? Cost wise they are unbeatable. Would like feedback if available. Good or bad. Want this to go smoothly with no regrets.

Secondly, there is a good chance I will move up to 35's with the next tire change. At least a year. I don't want to pay for re-gearing twice. If I opt for lower gears now(4.88) how bad will it be at highway speeds? Adversely how are 4.56's with 35's?

I appreciated any advice offered.

Thanks.

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Old 01-11-2016, 06:18 PM   #2
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Quote:
Originally Posted by TJ 4.0 View Post
I posted my plans in the general discussion, decided to bring them here to get a local viewpoint. Also pose a couple questions.

My TJ is a 97 with 4.0l, 5spd, 33" Duratracs, 4"SL, SYE, upper and lower adjustable control arms front and rear, D35/30, and 3.55 gears.

After almost a year ,of research and asking questions, I've finally decided to do the Ford 8.8 swap. Also re-gear to 4.56.

SFF Customs out of Parker will be doing the work. I've not been able to find much info online about this Shop. Anyone have any experience with them? Cost wise they are unbeatable. Would like feedback if available. Good or bad. Want this to go smoothly with no regrets.

Secondly, there is a good chance I will move up to 35's with the next tire change. At least a year. I don't want to pay for re-gearing twice. If I opt for lower gears now(4.88) how bad will it be at highway speeds? Adversely how are 4.56's with 35's?

I appreciated any advice offered.

Thanks.
Make sure it is the larger splines 8.8. There are a couple different types. I'm running 4.56 on 35's with a d44 rear and a hp d30 front. I do just fine and I do run the hell out of mine. With the d30 front the higher / lower geared you go the less tooth contact you get on the ring and pinion. However I do in a way wish I had done the 4.88's. My set up is similar to yours

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Old 01-11-2016, 06:24 PM
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Originally Posted by BV Jeep View Post
Make sure it is the larger splines 8.8. There are a couple different types. I'm running 4.56 on 35's with a d44 rear and a hp d30 front. I do just fine and I do run the hell out of mine. With the d30 front the higher / lower geared you go the less tooth contact you get on the ring and pinion. However I do in a way wish I had done the 4.88's. My set up is similar to yours
Thanks for the reply. It will be the 31 spline axle. Disc brakes. Limited slip for now. I'm pretty stoked about it.
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Old 01-12-2016, 04:55 PM   #4
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I'm like Doug, I have 35's with 4:56 and do okay, but wish I had 4:88's. I also have the Ford 8.8 in my 99 TJ.

Terry
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Old 01-13-2016, 02:05 PM
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So with my planned move to 35's, a year or so out, would 4.88 gearing now be OK? Researching on Grimmjeeper I'd be running 2900 and change with my current tire set-up at 75MPH. Not that I'd be driving that fast very often. LOL.

Thanks.
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Old 01-14-2016, 09:17 AM   #6
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You would be fine with 4.88s since your planning 35s later. Your engine will be just fine running that high of an RPM
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Old 01-14-2016, 07:36 PM
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You would be fine with 4.88s since your planning 35s later. Your engine will be just fine running that high of an RPM
Thanks. 4.88 it is. I was checking grimmjeeper and looks like 2900RPM and change at 75 with 33's. I can live with that. Don't plan to see 75 very often. LOL.
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Old 01-15-2016, 12:20 PM   #8
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SFF did my swap about 3 years ago...great guy

also did chromoly shafts on my d30 at the same time...and my IRO steering...
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Old 01-15-2016, 09:20 PM
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SFF did my swap about 3 years ago...great guy

also did chromoly shafts on my d30 at the same time...and my IRO steering...
Thanks for the info.
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Old 01-16-2016, 10:23 PM   #10
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Can't believe I didn't see this post earlier. Josh is a big hillbilly redneck but he has set up a lot of gears. He did my first re-gear before I learned to do it myself. He is a nice guy but I know some have questioned his skills in the past. I think he has set up enough gears now that it shouldn't be an issue. When I brought my axle to him I went to help him lift it out of the back of my Ford and he told me to move out of the way. He lifted the entire thing out by himself shafts and brakes included and carried it 50 feet to his workshop. He is a mongo for sure lol.

As far as gearing, go 4:88 now. I had 4:56 when I switched to 35's and it wasn't bad except for going up the mountain roads. I didn't think going to 4:88 would be that noticeable but it really was. Especially on the mountain roads.

If you are planning a locker, now's the time to do it too.
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Old 01-17-2016, 06:09 AM
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Originally Posted by hosejockey61 View Post
Can't believe I didn't see this post earlier. Josh is a big hillbilly redneck but he has set up a lot of gears. He did my first re-gear before I learned to do it myself. He is a nice guy but I know some have questioned his skills in the past. I think he has set up enough gears now that it shouldn't be an issue. When I brought my axle to him I went to help him lift it out of the back of my Ford and he told me to move out of the way. He lifted the entire thing out by himself shafts and brakes included and carried it 50 feet to his workshop. He is a mongo for sure lol.

As far as gearing, go 4:88 now. I had 4:56 when I switched to 35's and it wasn't bad except for going up the mountain roads. I didn't think going to 4:88 would be that noticeable but it really was. Especially on the mountain roads.

If you are planning a locker, now's the time to do it too.
Very good information. I appreciate the Review. I'm really looking forward to this upgrade. Thanks again.
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Old 01-23-2016, 08:19 AM
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Upgrade done.

Replaced the Dana 35 with a ford 8.8 yesterday. Josh at SFF Customs in Parker Colorado did the job.Very nice guy. Excellent value for the cost. Went from 3.55 gears to 4.88. Limited slip 31 spline axles. Wow what a difference. Huge improvement over the 3.55 gears. Disc brakes in the rear make stopping much more stable.

I am 100 miles in to the break in. Will do 500 miles. Change gear oil. Will be on the trails in Northern Colorado soon. Can't wait.

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