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Old 04-21-2016, 09:00 PM
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Question Rear diff online shopping

If you're wondering my current setup I have a 04 TJ Sport, 4.0, 3:73s, 42rle auto, Currie Currectlync, Zone 4.25 combo lift, all 8 Metalcloak Adj control arms, Metalcloak Front Adj Trac Bar, Barricade tube fenders, 33x12.5 Cooper STTs. I'm slowly working my way towards 35s. I'm also going to upgrade to Black Magic Brakes before I step up to 35s, but that purchase is already decided. I'm doing some window shopping online for an upgrade from the D35, and just wanted to see what you guys thought about what I've come across. I'll try to lay out all of the options I've selected and other features that come with each diff to give a solid comparison.


ECGS 8.8 $2575 shipped
31 spline Used shafts
axle tubes welded
brake line kit installed
used disc brakes
stock cover
Detroit TruTrac
Adv. Adapters SYE + Spicer driveshaft
new axle bearings,seals,ring and pinion,diff bearings
5:13 gears
both E-brake cables
gear oil added
----------------------------------------------------------------------
ECGS Dana 44 $3028 shipped
30 spline Chromoly shafts
axle tubes welded
used disc brakes
stock cover
Detroit TruTrac
Adv. Adapters SYE and Spicer driveshaft
Set 10 wheel bearings (retain wheel if shaft fails)
5:13 gears
both E-brake cables
----------------------------------------------------------------------
DnDoffroad 8.8 $1815.60 shipped
all new disc brakes
E-brake cables
5:13 gears with LSD (not sure what make)
new Yukon bearings
that's all the info on their page that I saw
----------------------------------------------------------------------
So what do you guys think? Which should I go with IF I decide to order a rear diff instead of having one built for me? Any and all input would be appreciated, especially from you seasoned Jeepers. Thanks guys!

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Old 04-22-2016, 12:23 AM   #2
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Based on your nice setup and the fact you wanna go to 35s, I'd say get the axle packages that would allow 37s. I say this because the Ford 9" in the rear (which is what I did) isn't terribly much more than the 8.8 I wouldn't think, but it's been awhile since I did that swap myself. I did look at the 8.8 and it was suggested to me back in '06.
I wouldn't go the 44 way since that doesn't leave you a truly bomb proof rear axle for the bigger meats on it. And those tubes are just as soft as the 35. You said you would weld them in so maybe that solves the problem on it.
If you got some cheese to spend, consider the Ford 9" in the rear and maybe a Dana 60 up front. At least you could have options to go up to 37s or maybe 40s(?) in the later future...
Otherwise, if you're sticking with the 35s, I'd try a 35 spline axle shaft in the rear too. Would be an immediate upgrade over the 31s despite their being true to form for the 35s

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Old 04-22-2016, 12:58 AM   #3
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Quote:
Originally Posted by Stratomaster2000 View Post
If you're wondering my current setup I have a 04 TJ Sport, 4.0, 3:73s, 42rle auto, Currie Currectlync, Zone 4.25 combo lift, all 8 Metalcloak Adj control arms, Metalcloak Front Adj Trac Bar, Barricade tube fenders, 33x12.5 Cooper STTs. I'm slowly working my way towards 35s. I'm also going to upgrade to Black Magic Brakes before I step up to 35s, but that purchase is already decided. I'm doing some window shopping online for an upgrade from the D35, and just wanted to see what you guys thought about what I've come across. I'll try to lay out all of the options I've selected and other features that come with each diff to give a solid comparison.

ECGS 8.8 $2575 shipped
31 spline Used shafts
axle tubes welded
brake line kit installed
used disc brakes
stock cover
Detroit TruTrac
Adv. Adapters SYE + Spicer driveshaft
new axle bearings,seals,ring and pinion,diff bearings
5:13 gears
both E-brake cables
gear oil added
----------------------------------------------------------------------
ECGS Dana 44 $3028 shipped
30 spline Chromoly shafts
axle tubes welded
used disc brakes
stock cover
Detroit TruTrac
Adv. Adapters SYE and Spicer driveshaft
Set 10 wheel bearings (retain wheel if shaft fails)
5:13 gears
both E-brake cables
----------------------------------------------------------------------
DnDoffroad 8.8 $1815.60 shipped
all new disc brakes
E-brake cables
5:13 gears with LSD (not sure what make)
new Yukon bearings
that's all the info on their page that I saw
----------------------------------------------------------------------
So what do you guys think? Which should I go with IF I decide to order a rear diff instead of having one built for me? Any and all input would be appreciated, especially from you seasoned Jeepers. Thanks guys!
If the D44 is a JK D44 then i would go for that one. Same strength as the 8.8 but the advantage is that you dont have a low hanging pinion and the D44 is a non c-clip design.
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Old 04-22-2016, 03:34 PM
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As far as I can tell the Dana 44s that ECGS supplies are actual TJ 44s. It would mean less angle and stress on my driveline, and not having the c-clip would be nice. But it is way more expensive as you can see. I really don't mind the idea of a 8.8 because I don't PLAN to go larger than 35s. This TJ gets street driven alot and it's more or less a weekend warrior build.
DnDoffroad also sells SYE kits, which isn't included in their price stated above. I probably should have thrown those numbers in the mix as well. Their SYE (dont know brand) is $195.95, so that brings their total to $2011.55 + drive shaft from someone else.
I may need to call them and ask what brands of LSD and SYE they use to see if they are quality or not. But, if they are fine, the extra money saved would be used to re-gear my D30 up front. Hmmmm, decisions decisions....
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Old 04-22-2016, 03:54 PM   #5
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Have you thought about pricing out a Junk yard axle build? Any 4x4 shops in your town? Or are you mechanically inclined to build it your self? you'll save a ton of money over a crate axle. And who is going to re gear your front? I assume you have a D30 up front? Have you found 5.13 gears for a TJ D30?
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Old 04-22-2016, 04:15 PM
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I have installed all the mods on my TJ myself, and have a few years of turning wrenches under my belt. But a re-gear is something I don't feel comfortable doing myself. What I'm trying to do here is make a decision on an online axle, so that when I shop around locally for someone to build an axle I have a choice to compare prices and options with. I'm not sure if any of my local shops offer 5 years parts and labor warranty like ECGS does, but that will be taken into consideration as well. Also, I believe I read on here that Revolution Gear & Axle offer 5:13s for the D30.
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Old 04-22-2016, 04:18 PM   #7
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Ok, to the other part of my post, I assume your running a LP D30 up front? Have you found 5.13 gears for the front axle?
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Old 04-22-2016, 04:22 PM
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Ring & Pinion Gear Set, Dana 30, Front, 5.13 - ALL-D30513RJK

Here are some 5:13s for my LP Dana 30
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Old 04-22-2016, 04:24 PM   #9
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Do the JK R&P fit a TJ D30?
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Old 04-22-2016, 04:27 PM
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I'm not sure if they do or not.
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Old 04-22-2016, 04:29 PM   #11
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I could be terribly mistaken, but I believe the 4.88 is the cutoff for the TJ Dana 30. Make sure you look into that before ordering
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Old 04-22-2016, 05:04 PM   #12
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They've recently come out with 5.13 gears for the 30.


I bought the ECGS 8.8 axle, and have been very happy with the results. Quality work. Mine was setup a little differently, using the Artec truss, ARB locker and 4.88 gears. I thought about the TJ D44, but when configured as close to the same as the 8.8, it was always $200 - 300 more.
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Old 04-22-2016, 05:43 PM   #13
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Oh awesome, do you know what company?
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They've recently come out with 5.13 gears for the 30.


I bought the ECGS 8.8 axle, and have been very happy with the results. Quality work. Mine was setup a little differently, using the Artec truss, ARB locker and 4.88 gears. I thought about the TJ D44, but when configured as close to the same as the 8.8, it was always $200 - 300 more.
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Old 04-22-2016, 06:01 PM
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Google, it does wonders my friend.
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Old 04-22-2016, 06:04 PM
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They've recently come out with 5.13 gears for the 30.


I bought the ECGS 8.8 axle, and have been very happy with the results. Quality work. Mine was setup a little differently, using the Artec truss, ARB locker and 4.88 gears. I thought about the TJ D44, but when configured as close to the same as the 8.8, it was always $200 - 300 more.
Yeah, I've heard nothing but good things about their work. Did you get their SYE and drive shaft as well? Or use someone elses? And you had to install them the same time as the new diff, correct?
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Old 04-22-2016, 11:49 PM   #16
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Oh awesome, do you know what company?
Dana 30 Short TJ: Ring and Pinion
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Old 04-22-2016, 11:52 PM   #17
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Yeah, I've heard nothing but good things about their work. Did you get their SYE and drive shaft as well? Or use someone elses? And you had to install them the same time as the new diff, correct?
I already had the SYE and CV drive shaft, so all I had to order was the axle. They really do outstanding work, and are very easy to deal with.
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Old 04-23-2016, 02:53 AM
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Please correct me if I'm wrong here, but if I'm planning on swapping to a different rear diff and I install the SYE and CV drive shaft now, when I get the new diff I will have to either replace the new CV shaft or have someone shorten it, yes? I'd rather not have to do that if it's true.
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Old 04-23-2016, 11:16 AM   #19
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It's a possibility. In my case, I didn't have to. There was less than a 1/2" difference, and I had plenty of room to spare. I set mine up with the U-bolt/yoke. I also had adjustable control arms, and a 3.5" lift, when I installed the axle. I didn't change the LCA, but did have to adjust the UCA some.

I have a 4.0L/AX-15, if you have a different transmission, it might work out differently for you.
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Old 04-23-2016, 12:19 PM   #20
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I wouldn't go to 5.13 in a D30. 4.88 is even pushing the limits. The lower the gear ratio, the smaller the pinion gets and less contact is made with the ring gear.


here's a stock photo of a D30 5.13 ratio. Look at the dinky pinion..
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Old 04-23-2016, 12:40 PM   #21
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I wouldn't go to 5.13 in a D30. 4.88 is even pushing the limits.
No 4.88 isn't pushing the limits, it's been used without problem for MANY years, myself included in two different TJs. There were naysayers way back that said the same thing when 4.88 first came out for the Dana 30 in the late nineties but it has proven to be a solid and reliable ratio over many years of use. It's a commonly installed ratio. Three different companies have the 5.13 gearing out now and it was well tested. Revolution Gear & Axle was the first to come out with 5.13 for the Dana 30 and they did so only after extensive long-term testing on some very hard core rigs.
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Old 04-23-2016, 04:02 PM
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No 4.88 isn't pushing the limits, it's been used without problem for MANY years, myself included in two different TJs. There were naysayers way back when that said the same thing when 4.88 first came out for the Dana 30 but it has proven to be a solid and reliable ratio over many years of use. It's a commonly installed rati.. Three different companies have the 5.13 gearing out now and it was well tested. Revolution Gear & Axle was the first to come out with 5.13 for the Dana 30 and they did so only after extensive long-term testing on some very hard core rigs.
I was a little weary at first about the large gears in the D30, thanks for that info Jerry it sets my mind at ease. Since the possibility of having to send out a new drive shaft does linger after swapping diffs, I may just hold off on the SYE install and order it all at once. I was hoping to spread out the workload a little, but it seems like this will save me some money and effort.
I wonder if the Spicer drive shaft that ECGS supplies is a CV shaft? Anyone know for sure? If so, getting everything I need in one order will be sweet!
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Old 04-23-2016, 06:13 PM   #23
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I'm not sure, but give them a call...easy to work with, and know their stuff.
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Old 04-23-2016, 10:27 PM
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After specifically looking up their TJ SYE drive shafts, it seems they are CV. That makes everything that I need to upgrade my rear driveline all in one purchase. Awesome! I would then just have to find a shop to re-gear my D30 up front and I'd be good to go. Guess I'll do some calling around and see what they would charge to build an 8.8 like what I can order from ECGS and determine which way I prefer to go. Thanks for the input everyone, I really appreciate it.

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