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Old April 2nd, 2018, 11:59 PM   #1
92XJT
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Default 2016 JKU build

So yeah, for all the years I belonged to this site, bought and sold many parts, with my umpteen trillion different directions of wheeling rigs figured it was time to do a build thread.

I've been all over with rigs: modded XJ with cage and boggers, CJ7, built YJ on 1tons (bought on this site), 07 powerwagon, '12 JK, rzr S, 03 rubicon, xp1k, etc.........

So decided to swing by one of the local dealerships, and we stumbled upon this gem. Actually wife was on board quicker than I was this time, but me knowing if / when we got back into my fairly new Polaris XP1k would have to go bye, bye.

Before buying I asked around on a local FB jeep page, and found the original owner within hours. Was able to talk with him, get the list of mods he did, and really find the main reason why he traded it in - upgraded to Rubicon. Actually this jeep has wheeled some cool trails already: Imogene Pass, Engineer Pass, Yankee Boy, and Ophir pass.

2016 JKU sport with 29k on the clock, still under factory warranty, plus a "certified vehicle" so has 84k mile warranty with $100 deductible after factory one runs out.

Current Mods:
RC 2.5" lift
RC dual steering stabilizers
RC sway bar discos
RC rear track bar relocation bracket
Flash Cal for speedo correction
RC 1.5" hubcentric spacers to run stock rubi rims on 35" BFG KO2s
RR exhaust spacer
Smittybilt rock rails
Oracle LED head lights
Amazon JW speaker replica LED tail lights
4 sets of key FOBs (added factory remote start)
Hard and soft tops

Since taking possession a month ago added Rugged Ridge hood latches - a must, as most know with the freakin hood flutter in these things.

Also knew going into the deal that I would need to add gears down the road since 3.21s are not highly desirable. For cruising around town wasn't bad though.

FF a few weeks after buying the jeep, I found a buyer for my XP1k leading to me having $3500 in mod money. So like any sane person I decided might as well add gears, and shoot since we are in there lets add some lockers.

4.56 gears and master install kits
D30 Eaton E-locker
D44 Auburn E-locker (limited slip when not locked).
Superchips Flash Cal (previous owner didn't include his, and had it unlocked for his new jeep. Per Superchips the new flash cal should overwrite the old one).

lol - no way I trust myself with this install, so will be heading to the shop April 16th for the install.

So that gets us to current status of the JK. Next round of mod money will be Poison Spyder winch bumper and Smittybilt winch.
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Old April 3rd, 2018, 08:43 AM   #2
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Looks good so far - my only suggestion is go lower than 4.56. You don't mention tire size, but in my experience with the JK it's better to run 5.13s or lower, even on 35's. And then you will be more prepared if you decide to go larger down the road.
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Old April 3rd, 2018, 09:08 AM   #3
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If it was me I would stick with 4.56, especially on a DD. My wife's Rubicon on 33's and 3.73s doesn't really feel under powered, but it does seem to run pretty high rpms cruising at highway speeds. Been a little while since I drove it but something like 2300 rpms at 70. 5.13s and 35s would really be making that motor rev, completely killing all mileage on the highway. And if tires bigger than 35's are desired, you can kiss that dana 30 goodbye.

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Old April 3rd, 2018, 09:27 AM   #4
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Looks good.
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Old April 3rd, 2018, 09:33 AM   #5
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Originally Posted by Ryanw10 View Post
If it was me I would stick with 4.56, especially on a DD. My wife's Rubicon on 33's and 3.73s doesn't really feel under powered, but it does seem to run pretty high rpms cruising at highway speeds. Been a little while since I drove it but something like 2300 rpms at 70. 5.13s and 35s would really be making that motor rev, completely killing all mileage on the highway. And if tires bigger than 35's are desired, you can kiss that dana 30 goodbye.

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I have not drove the 3.6 on 35's but I have drove the 3.6 on 37's and 5.13's. Does just fine and has enough low end to wheel as well. Still averages a solid 15-16 mpg.

I have also drove the 3.8 on 35's and 5.13 and IMO wouldn't want to go much less - that motor is a real dog. Changing the shift points and lower gears help to make DD duties manageable.

I'm not necessarily saying 5.13's but even 4.88's would work much better than 4.56. You already compromise mpg and creature comforts with a ROUGH country lift and bigger tires. It sounds like he intends to wheel it. So if it were me I would go with something a little lower. Just personal preference I suppose.

I fully agree with the D30 though. Even the rubicons are pushing their limits with a stock front end and 37. Wouldn't feel too comfortable unless I had it sleeved and gusseted.

Last edited by Cool Hand Luke; April 3rd, 2018 at 09:41 AM.
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Old April 3rd, 2018, 10:14 AM   #6
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I have not drove the 3.6 on 35's but I have drove the 3.6 on 37's and 5.13's. Does just fine and has enough low end to wheel as well. Still averages a solid 15-16 mpg.

I have also drove the 3.8 on 35's and 5.13 and IMO wouldn't want to go much less - that motor is a real dog. Changing the shift points and lower gears help to make DD duties manageable.

I'm not necessarily saying 5.13's but even 4.88's would work much better than 4.56. You already compromise mpg and creature comforts with a ROUGH country lift and bigger tires. It sounds like he intends to wheel it. So if it were me I would go with something a little lower. Just personal preference I suppose.

I fully agree with the D30 though. Even the rubicons are pushing their limits with a stock front end and 37. Wouldn't feel too comfortable unless I had it sleeved and gusseted.
Another thing to consider with 5.13s is the gear set size...its been a long time since I have had to deal with a dana 30 but I didn't really think they even went deeper than 4.88 cause the pinion got so small

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Old April 3rd, 2018, 12:34 PM   #7
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Another thing to consider with 5.13s is the gear set size...its been a long time since I have had to deal with a dana 30 but I didn't really think they even went deeper than 4.88 cause the pinion got so small

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Old April 3rd, 2018, 01:02 PM   #8
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Still going to be a DD so 4.56 will be a good compromise for highway and trail. Figure it will see speeds up to at least 80mph. 5.13s would be screaming down the road.

Sticking with 35s for now, maybe some years down road up to 37s. But if/when that comes would prefer minimum D44.

Unfortunately with my multi projects of rigs I won't be focusing all funds to the JK. After the retaining wall deemed "the great wall of Ed" is done that does free up $500/month in warmer months. Also have a 47 willys in my warehouse, along with picked up a sportsman 850, that I can't leave stock.
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Old April 3rd, 2018, 01:16 PM   #9
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So little off subject.
Attached pic, one is my partial retaining wall picks: thousands of bricks laid, hundreds of yards of dirt moved, along with 3/4 wash and limestone screenings.

Next is my 2010 sportsman 850 that was a partial trade towards my XP1K - needs new larger tires, possibly lift, etc.

And the willys which was pulled from my friends field where it sat for approx. 18 years.
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Old April 3rd, 2018, 03:37 PM   #10
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Quote:
Originally Posted by Ryanw10 View Post
If it was me I would stick with 4.56, especially on a DD. My wife's Rubicon on 33's and 3.73s doesn't really feel under powered, but it does seem to run pretty high rpms cruising at highway speeds. Been a little while since I drove it but something like 2300 rpms at 70. 5.13s and 35s would really be making that motor rev, completely killing all mileage on the highway. And if tires bigger than 35's are desired, you can kiss that dana 30 goodbye.

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I though all rubicons were 4.10? I know my wife's is. I thought that was standard.
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Old April 3rd, 2018, 03:44 PM   #11
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Quote:
Originally Posted by CheapThrillB2 View Post
Quote:
Originally Posted by Ryanw10 View Post
If it was me I would stick with 4.56, especially on a DD. My wife's Rubicon on 33's and 3.73s doesn't really feel under powered, but it does seem to run pretty high rpms cruising at highway speeds. Been a little while since I drove it but something like 2300 rpms at 70. 5.13s and 35s would really be making that motor rev, completely killing all mileage on the highway. And if tires bigger than 35's are desired, you can kiss that dana 30 goodbye.

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I though all rubicons were 4.10? I know my wife's is. I thought that was standard.
I thought the same thing until we ordered ours. apparently the 2012 + rubicon's are 3.73 for autos and 4.10 for manuals. I ordered the optional 4.10s with the auto. Was no price difference
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Old April 3rd, 2018, 03:45 PM   #12
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Our 14 has 4.10s. Po must have optioned up lol
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Old April 3rd, 2018, 03:47 PM   #13
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I though all rubicons were 4.10? I know my wife's is. I thought that was standard.
I thought so too until I saw a set of Rubicon axles for sale that claimed 3.73s. I did some research and what I found was the auto Rubicons came with 3.73 and the manuals had 4.10, my wife's is an auto

Edit: fabricator beat me to it but I didn't realize it was only for 2012 and up. My wife's is a 2008 so maybe she does have 4.10 haha

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Old April 3rd, 2018, 03:47 PM   #14
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Yeah there was a few year span where 3.73s standard in auto, I thought you could option up to 4.10 if you built one?
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Old April 3rd, 2018, 03:58 PM   #15
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My wife's is a auto w/4.10s.
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Old April 3rd, 2018, 05:07 PM   #16
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I have a Jk front rubicon housing, shafts, and the 4.10 gears. No locker though
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Old April 22nd, 2018, 05:44 AM   #17
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Well as the JK sits in the shop that is doing the gear / locker install - time to start shopping / prepping for next round of mods. Technically yes, I shouldn't have spend the kind of money on the D30, but I think it will be fine for the next few years. Not like I am doing any hardcore wheeling, and figured it wasn't that much more to get the locker vs carrier, and they were going in to do the gears anyways. Eventually will upgrade to aftermarket 44 front, but that's a long ways out.
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Old April 23rd, 2018, 06:13 AM   #18
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I have a Jk front rubicon housing, shafts, and the 4.10 gears. No locker though
Price on the housing and shafts
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Old June 30th, 2018, 08:40 AM   #19
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Nothing too much to add lately - had to get the house stained so that was a huge setback planned this year.......

Picked up Poison Spyder diff covers, and of course got the lube lockers after changing fluids so will add those later.

We had a Jeep meet at a car show a few weekends back. Wasn't going to bother to enter since my jeep is fairly stockish, but luckily, in a sense, I haven't had time to wheel so my jeep was the cleanest. lol - too all our surprises in our the jeep / overland class I took best of show (out of only 10 rigs).
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Old June 30th, 2018, 08:47 AM   #20
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While changing my diff fluids after the 500 mile break in I found some front locker issues. Course contact the shop that did install and got really nothing back from them. On the front electrical connection they used Delphi weather packs, and as you can see they never put the 1/2 on the wires coming out of the axle. They say they did, but couldn't explain how the piece was gone. You would think if they did, and for some reason the plug pulled out of the wiring, that the piece would have been connected to other half on the wiring harness....

Soooo some internet searching and I found the piece I needed, but of course had to buy X amount minimum. I now have a few spares - lol.

Tested lockers again real quick in the back yard.

We also had an atv tripped planned up north in the Keweenaw, and this all fell right after the great flood that reeked havoc around Houghton, Hancock, Riply, Tamarac, and Lake Linden. Took the jeep just incase the roads were still bad, which surprisingly 4 days later most main ones were open and clear. First tow test for the JK - yep it sucked. Was about 1700lbs with trailer and machine - though head wind like usual in WI and 80pmh resulted in around 13.4 mpg....
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