Quick 8.8 Question - JeepForum.com
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post #1 of 12 Old 06-10-2021, 09:12 PM Thread Starter
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Quick 8.8 Question

There are a couple Exploder Limited Slip 3.73 8.8 axles for sale locally pretty cheap. My YJ is the 2.5 squirrel version so has the 4.10/4.11 gearing. My question is can I swap ring and pinion to convert the 3.73 to the 4.10/4.11 without any other alteration? I plan to go thru and change all the bearings in the process but didnt know if the case will accept the different gear set.


Both have disc brakes and I am aware of the Ebrake issues after reading many threads about the swap. Thanks to all who have done this swap and posted up the processes and pitfalls.



That is all. Thanks!

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post #2 of 12 Old 06-11-2021, 12:02 AM
timatoe
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Yes, but you can't simply swap the gear set. You have to do the actual set up of the gears, backlash etc etc. It will be cheaper in the long run to find one with 4.10 gears.

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post #3 of 12 Old 06-11-2021, 12:44 AM
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I found a 8.8 and a D30 both with 4.10s at a LKQ warehouse both for around $600 like 6 years ago. Musta been some sort of fluke.

Trying to weld has honed my grinding skills


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post #4 of 12 Old 06-11-2021, 05:53 AM
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www.car-part.com You should be able to find what you need there.

I'd definitely pay even $200-$300 more just to not have to do gears. Between the gears, bearings, and almost the full day it'll take to do it, it's worth finding a 4.10 geared 8.8. Also, the limited slip diff that most junkyards call a locker typically doesn't cost anymore than the open diff versions. The only downside with the LSD version is that you have to install a full carrier locker if you upgrade and can't install a lunchbox locker. Then again, lunchbox locker in the rear is not ideal so it kind of forces you down the right path.
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post #5 of 12 Old 06-11-2021, 06:58 AM
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+1 - try to find one with 4.10s. In my pull-a-part experience (several trips), they are uncommon and harder to find. But worth the cost savings and hassle not to have to mess with the gears.


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post #6 of 12 Old 06-11-2021, 07:29 AM
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I went in the other direction. I just wanted a 8.8 axle without anything in it, then add nice new parts of my choosing, so I have a known entity when done. Don't be intimidated by doing gears. It's not rocket surgery, just time consuming. My only special tools are a micrometer to measure shims and a dial indicator for backlash. I did my first r/p 20 years ago after only talking to a buddy on the phone for 30 mins to verify my plan, no JF back then.

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post #7 of 12 Old 06-11-2021, 10:35 PM Thread Starter
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Quote:
Originally Posted by JeeperDon View Post
I went in the other direction. I just wanted a 8.8 axle without anything in it, then add nice new parts of my choosing, so I have a known entity when done. Don't be intimidated by doing gears. It's not rocket surgery, just time consuming. My only special tools are a micrometer to measure shims and a dial indicator for backlash. I did my first r/p 20 years ago after only talking to a buddy on the phone for 30 mins to verify my plan, no JF back then.
Don, thanks for your and everyone elses response. I completely understand the process of setting up the gears and yes, I think it would take me quite a while. Ive searched the JY's for the unicorn D2 and am having no luck. The recent discovery of the two D4's got me thinking about just rebuilding one to make it a D2. Having an axle I know will last makes a big difference while I am building my YJ into what I want. With the addition of the Vortec V6 I just scored, the pie in the sky plan is coming together. The V6 is a bit of an unknown so I will tear it down and at minimum replace bearings, rings and seals. The S10 Blazer donor was retired because of an electrical problem the owners couldnt solve. I got the whole truck for $100. "Get it out of my yard" was the owners statement as I handed him the C note.



I think the engine is in good shape but we will see. Its located 120 miles away at a friends close to where I bought it from his son's in laws. My friend will pull the engine and drive train which I will bring to Jacksonville to start the rebuild process at my convenience then back down to my buddy's shop for fabrication into my YJ. I wish I could drag the whole thing here and do the work but Jacksonville's Zoning Department tours my neighborhood often. Codes forbid any "major repair" work at my house. If I had a shop it would be different. Hell, if I had a 10'X10' piece of concrete, I would do it.


The D4s are $150 or less and new ring, pinion, and bearings about $200. Spit balling someone else setting the gears up properly for another $150 and I will have a known quantity, good as new axle to install for less than buying a used D2. Now I know the gear set swap will work, its the way I will go. Buying a limited slip D4 and set up I think is cheaper than buying a dog leg 42 axle and installing a limited slip chunk. A lunch box locker wont be the best way for me to go and with the new posi chunks starting at around $500, its more expensive than using OEM Ford posi.



Oh how the wheels turn. As I sell off some of my rifles to finance the YJ, the mod budget grows. The first one sold this week, four more to go, and I can either start the V6 rebuild or the 8.8. A $4K kitty will go a long way for mechanical mods. Decisions, decisions, lol.
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post #8 of 12 Old 06-12-2021, 08:34 AM
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Ford produced a LOT of explorer's with the 4.10 Open setup.

Just saying. If you can hold out, it might be worth it financially.

Other than that, best of luck with the mod!
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~YJOTM MAY '16, JULY '19~


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post #9 of 12 Old 06-12-2021, 10:57 AM
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Quote:
Originally Posted by bruinjeeper View Post
Ford produced a LOT of explorer's with the 4.10 Open setup.

Just saying. If you can hold out, it might be worth it financially.

Other than that, best of luck with the mod!
I looked and looked and then suddenly a bunch showed up. just be careful not to get an 8.8 out of the wrong vehicle, there were tons of variants
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post #10 of 12 Old Yesterday, 09:51 AM
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Quote:
Originally Posted by jbolty View Post
Quote:
Originally Posted by bruinjeeper View Post
Ford produced a LOT of explorer's with the 4.10 Open setup.

Just saying. If you can hold out, it might be worth it financially.

Other than that, best of luck with the mod!
I looked and looked and then suddenly a bunch showed up. just be careful not to get an 8.8 out of the wrong vehicle, there were tons of variants
I suppose they are gonna be more common in Canada.

Not nearly as many builders from what I can tell up here. My first weekend searching, I found 4.10 open 8.8 for $80.

(+ the cost of new gears 4.56)

~YJOTM MAY '16, JULY '19~


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post #11 of 12 Old Today, 02:33 AM Thread Starter
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Quote:
Originally Posted by bruinjeeper View Post
Ford produced a LOT of explorer's with the 4.10 Open setup.

Just saying. If you can hold out, it might be worth it financially.

Other than that, best of luck with the mod!
Thanks Bruin, Ive seen a few 42's out there. I thought about this variation. While its an option to have a dog leg, the cost of making it into a posi is much greater than having a posi to begin with. The aftermarket posi like an Eaton may be better and being new, it makes the system better.


Ford does have a few different vehicles with lighter 8.8 posi's. I assume maybe axle spline count maybe? I was looking at TheRangerStation.com at the different weight classes. It got me wondering what makes, for ex. a Ranger less than an Explorer. 2750 vs 3200. There are 7.5" ring geared and 8.8"s While the 3200 8.8 is the best choice, our Wranglers arent that heavy. Why is the 2750 8.8 out of a Bronco 11 so less desirable?


Racers like the 8.8's as well and makes the competition even bigger at the U Pull Its. Finding one already pulled in some variation is a big plus in my book. I hate to let them slide by, just like the $100 "Get it out of my yard" 4.3 Blazer. It isnt without issues either, a rebuild and a stand alone wiring harness will be in my future. I dont mind changing an R&P, bearings and seals to have a good known entity.


This thread is turning into bigger than a simple one question thread, lol. Thanks for the input guys!
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post #12 of 12 Old Today, 04:07 AM
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Quote:
Originally Posted by SevenSlotAddict View Post
Quote:
Originally Posted by bruinjeeper View Post
Ford produced a LOT of explorer's with the 4.10 Open setup.

Just saying. If you can hold out, it might be worth it financially.

Other than that, best of luck with the mod!
Thanks Bruin, Ive seen a few 42's out there. I thought about this variation. While its an option to have a dog leg, the cost of making it into a posi is much greater than having a posi to begin with. The aftermarket posi like an Eaton may be better and being new, it makes the system better.


Ford does have a few different vehicles with lighter 8.8 posi's. I assume maybe axle spline count maybe? I was looking at TheRangerStation.com at the different weight classes. It got me wondering what makes, for ex. a Ranger less than an Explorer. 2750 vs 3200. There are 7.5" ring geared and 8.8"s While the 3200 8.8 is the best choice, our Wranglers arent that heavy. Why is the 2750 8.8 out of a Bronco 11 so less desirable?


Racers like the 8.8's as well and makes the competition even bigger at the U Pull Its. Finding one already pulled in some variation is a big plus in my book. I hate to let them slide by, just like the $100 "Get it out of my yard" 4.3 Blazer. It isnt without issues either, a rebuild and a stand alone wiring harness will be in my future. I dont mind changing an R&P, bearings and seals to have a good known entity.


This thread is turning into bigger than a simple one question thread, lol. Thanks for the input guys!
Rangers = less spline count.

Dont forget if you can find an explorer sport-trac. I believe they carried the 8.8 with discs a few years after the regular explorer went to IRS. Gives you a few more models to choose from

~YJOTM MAY '16, JULY '19~


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