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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
???
 
#210 ·
Possibly. If I do that I want it to look as seamless as I can make it. So if I get to that point and I feel like I can pull that off I might try.

I had planned on using a XJ hood and a narrowed header panel/grill. Still plan on doing the header/grill but not to the point of figuring out how to make it happen.
 
#212 ·
I'm going to try really hard to use factory pieces as I think it looks better (if done right). But my back up plan is to do just that, designing my own grill. I've tried to do it just based on guessing dimension and it never looks right. But maybe if I had some factory pieces to take actual measurements off of I bet I could pull it off.
 
#213 ·
I'm getting ready to try and figure out where to locate the hydro ram on my front axle (2005+ D60). Anyone have do's/don'ts to share? My only goal at the moment is to keep it as high as possible so its not getting hit or hung up on rocks. Anything else I should consider? Do I want the ram and tie rods as close to being inline as I can with the wheels pointed straight? Any thoughts on off setting the ram to the passenger side instead of centered on the axle?


My first thought was something like this
Image



But also like the idea of mounting it off of the truss like this. But not sure if its possible on a standard 60.
Image
 
#214 ·
As high as possible to be in line, or just below your high steer arms. I say below so you can do double shear. DO double shear!
As close to center as reasonably possible to keep your tie rod linkage symmetrical.
Don't make it a duck bill sticking out. If it gets bent, you are hosed. (literally LOL)
Triangulate your mounting so that if it gets bumped, it has a chance of staying in place.
 
#219 ·
I built mine off the truss. Thick plate that welds to the top of the truss and the bottom is welded to DOM that spans knuckle to knuckle. I bought Crane knuckles and used their histeer arms.

Image



Image


I used DOM tubing. Drilled out the arm and welded it in. Adjusted the height with how much stick out I wanted. I'd love to do it again as I have the mill now where I can drill the hole on an angle. I had to make small miss alignment spacers as it would bind at around 98% lock. Nice thing about having the DOM is when the hole wears out, just grind/cut and weld in a new piece.
Image


Used Wide open design truss and ram mount:


 
#227 · (Edited)
@JohnnyJ do you like your ram mount/truss? I've got some 2"x1/4 wall tubing. My initial idea was to do something like you have.

I like what I have so far, it's minimal and feel like it's stout. But I'm open to other ideas.
Yes, seems to be holding up well so far. The front bash bar cross piece is 2x0.375 and the sides are 1.5x0.250. The ram mounts to 1/4" plate, and I wanted the bash bar up as high as possible, so I notched out the back side of the tube to make room for the ram mounts. Plans are to add an upper support that ties the bash bar to the truss for reasons white rhino mentions. My thought is to make it dual purpose and create a winch tie down for it. I don't use a winch tie down frequently, but it's nice to have the option.

 
#223 ·
The design looks good, I'd just add some tubing for more support. I've hit my ram mount a lot on big rocks. Would reallllllly suck to bend the mount and screw up the steering.

Take a look through these builds for ideas: Gallery
I bent my ram mount in Utah, which sheared the ram bolts, which sheared the ram hose fittings, which emptied my hyd reservoir, which left me stranded on the mountain. If you think you "might" bend it, reinforce it in advance.
Image


My previous comment was ignored, but just as important. A truss over the top of the axle does not keep it from bending front/back. I've bent an axle twice front to back and also popped the rosette weld, which allowed my tube to twist. As long as you are making a ram mount, make it a front truss.

Image
 
#224 ·
yikes. That would suck hard. I see a lot of builds where its just a 1/4" plate and they are shocked when it bends. That is why I like the DOM that spans knuckle to knuckle to help keep everything inline and hopefully prevent the bending back/forward. I defiantly weld the tubes on all my axles....first thing I ever do before anything.

@xj4life I'd also make sure you full bump the axle to make sure everything clears. I have around 2" before it hits the radiator/grill.
 
#225 ·
yikes. That would suck hard. I see a lot of builds where its just a 1/4" plate and they are shocked when it bends. That is why I like the DOM that spans knuckle to knuckle to help keep everything inline and hopefully prevent the bending back/forward. I defiantly weld the tubes on all my axles....first thing I ever do before anything.

@xj4life I'd also make sure you full bump the axle to make sure everything clears. I have around 2" before it hits the radiator/grill.
Exactly!
 
#233 ·
Quick update. Not much been going on as I have been sick for the last five weeks with an unknown illness. Starting to feel better but lost a lot of strength and stamina.

Yesterday I started welding up my high steer arms on the stock knuckles. Decided to pick up some $$$ ERNiFe-Cl mig wire to make sure I got good welds. Took me a bit to figure out how to weld with that wire and end up getting some cracks as it cooled. Don't think I gave them a good enough pre-heat. Going to grind them out and give it another try. If I can't get good welds I've decided I'll drop the coin on some Reid knuckles and bolt-on high steer arms.
 
#236 ·
I appreciate the encouragement. I'm getting close to seven years on this build, definitely not quitting but go through mental slumps at times. Just keep making forward progress every week.

Carrier doesn't go in straight in/out, have to angle it a little but but its not to difficult and there is room to spare. If it ends up being a problem I think I can come up with a way to have a section of the tubing be bolt on.
 
#241 ·
Anyone run 4.10's with 40's and not a lot of motor. I bought both axles for my buggy project with 4.10's cause I was trying to keep it budget friendly build. Its no longer a budget build :ROFLMAO: I'd rather not buy gears but if its going to be a total turd I may reconsider. My D300 has 4:1 low, puts my crawl ratio at 45:1. I've run 40:1 on 36s so I think crawl ratio will be fine for the time being.

But beyond crawling I dunno. I've got a manual shifter on my AW4 so I can hold any gear I want. So maybe I stay in low range and shift the trans to scoot around, extra wheel speed, etc. I think that's what I used to do in my old XJ...been so long I dont remember for sure.
 
#247 ·
My cousin is running my old 42’s iroks on steel beadlocks. He’s running 4.10’s in his axles with 4.0 aw4. It’s not ideal but it works. Locks it in low 1 and does fine for crawling, on a budget it works


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Thanks for the feedback. Sounds a lot like what I remember doing with my XJ.