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Project Midlife Crisis

67K views 378 replies 27 participants last post by  xj4life  
#1 ·
The planning stages of this build started about five or six years ago, but four years ago while going through a divorce I decided it was time to stop waiting and to pursue my dream. Couldn't think of a good name for this build, but since I'm turning 42 this year Project Midlife Crisis seems fitting :sonicjay: Its going to be used for all types off wheeling but with a focus on rock crawling.

I had a couple goals in mind with this build when I started...1) Learn a lot. This is my first buggy build. I knew I had a lot to learn and it may not work perfect when I'm done but I didn't want that to stop me. Only one way to learn and that's by doing things and making mistakes. 2) Budget...I'm a single Dad with two young kids so have to keep cost as low as possible. 3) Jeep based powertrain. Why? Well Jeeps are what I know, they are what I love, and being that my time and money were limited I decided to not pursue the LS route. 4) Design/fabricate as much of this build as I can. I am a mechanical design engineer with access to fabrication equipment and I love metal fabrication. So I knew I'd enjoy building this just as much as driving when I'm done.

So four year ago I picked up donor 199? XJ, some DOM tubing, and got started. I spent some time rough modeling the build in CAD before cutting any steel. I'm only working out of my two car garage at home and I don't have easy access to a bender so I designed the chassis with as few bends as possible. Also tried to make the design simple enough for me to assemble. I tacked together the base cradle on a layout table at work but everything else I've done at home. I've had to make a few adjustments to my original design but I have to say I'm pretty happy with how well its gone so far. I have a lot of work left to do (and money to spend :sonicjay:) but figured it was time to start a build thread. I've got questions on a few things that might get answered and it might help keep me motivated to finish this thing some day. I only get a few hours a week to work on this project so over the last four years I've been chipping away at it when I my schedule and cash flow allow.

Build Specs/Plans:

Chassis:
2 seater (might see if I can fit a small bench seat in back for my kids)
113" wheelbase
21" belly
Main chassis is 1.75"x0.120 DOM, frame rails are 2"x4"x3/16" wall rectangular tubing, sliders are 1-7/8"x1/4" wall DOM

Powertrain:
Jeep 4.0...I was told its had some internal work and computer upgrades but have no way to confirm that. I was able to drive the donor Jeep before gutting it and it did seem to have more power than a stock 4.0.
AW4 with RAD manual shifter
Flipped D300 with 4:1

Front Axle:
Ford BJ Dana HP60 housing (not sure the exact year, 92-99 range I believe) w/ 4.10 gears (for now)
Barnes4x4 HD diff cover
Full hydro steering
My own truss and link mounts
Couple unknowns at this time. One, which locker I'm going to use. Second, what D60 outers I'm going to use. More on that below.

Rear Axle:
14 bolt w/ 4.10 gears (for now)
Probably a Detroit locker
Barnes4x4 pinion guard with the truss tie in, disk brake brackets, and HD diff cover
My own truss and link mounts

Suspension:
Double triangulated 4-link front and rear
Lowers are going to be 7075 aluminum and uppers are going to be 1.75x0.120 wall DOM
1-1/4" heims all the way around
Current plan is 16" travel coilovers on all four corners with 5" up travel, and 10" of droop (11" of droop might cause issues, we'll see)

Tires/Wheels:
Chassis and suspension are set up to run 40"x13.50" tires, not sure which ones yet.

Interior:
Corbeau suspension seats with 5pt harness
Basic gauges
???
 
#286 ·
No pictures to add but just felt like updating this post. Been working hard on the axles.

14 bolt is pretty much wrapped up for now: new seals, all the bearings looked good so I'm going to reuse them, reset the gears (pattern sucks but is what it is for used gears), Yukon grizzly locker, disc brake conversion, new upper link brackets that better match the theme of the build, had to modify the Barnes 4WD diff cover, shaved the housing....and then desided I wasnt comfortable with how thin the housing got so I fab'd up a skid plate that smooths out the bottom and added back some thickness.

05+ front 60 I pulled everything from the diff, all the bearings, races, seals, etc. Pulled the 4.10 pinion and ring gear from my mid-80s 60 and working on getting them prepped to go in the 05+. Next week I should be getting the 05+ put back together: all new bearings, seals, and Spartan locker.
 
#291 ·
Came across an oddity last night. This is my first time messing with a 14bolt so not sure if this is normal or not. Was trying to install passenger side axle shaft and was struggling. Looked down the tube and looked like the locker was offset in the carrier. Odd. Pulled the carrier and it looks like what I was seeing was actually an offset in the casting of carrier. Hard to convey this in pictures but lets try.

Red surface is what would be inline with the splines. Green surface is set back from that but its not concentric with the red surface. Almost like the casting was offset. Is this normal?


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#293 ·
Yeah who knows. I was able to get the shaft in on Sunday but took me a bit to find the hole.... :ROFLMAO: I've never run a 14 bolt before so not sure if it was me being a newbie or what. Run it and see what happens.

After my intital bout with the 60 I decided to buy setup bearings. Excellent decision on my part 😁 Also loosened up the ID on my outer pinion bearing so it wasnt so hard to get on and off. Those two things helped a ton and I think I got the BL and pattern about is good as its going to get.
 
#300 ·
Both axles are just about wrapped up in terms of their rebuilds. Took longer than I expected but I learned a lot so happy about that. Ordered up some American Iron outer knuckles and their ball joint deletes so that I can get the steering finalized. While I'm waiting on that stuff to show up I'll get the hydro ram mount built up on the 60. Will be nice to do some metal fabrication for a change :ROFLMAO: Once that's all done time to tear into my 4.0 and see why the crank shaft has a ton of end play.
 
#310 ·
Cool idea. I never had an issue with bolts backing out. However, I know this is more common with hardened shafts. I just blue loctite them. Will see if I have issues. If I do, I thought about just drilling the heads and saftey wiring them. Give it that cool aviation feel! Cool solution to an issue that should work.
 
#314 ·
Those of you running the 05 and newer front 60's....and might be the 99-04 too. Did you keep the factory vacuum seal on the axle shaft? Google search didn't give me to much info other than probably helps keep dirt and water out for longer bearing life. Just don't feel like fighting that seal if I don't need to. If it's worth keeping I thought about trying to sand the rubber down a little so it's not so difficult to install and smear some grease to help seal out water.

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