03 Expedition Solid Axle Swap

Well over the 4 years of building my Expedition the way I want it for off-roading and now I'm at a point where its gotta get jacked up more.
Everybody says jus sell and get a truck. Well the thing is the Expedition suits my needs for what I do and a truck just isn't what I need or want.
I've done the 3/2 suspension lift fixing to do a 2" body lift. But at the end of the day it's not what I want.
I want 8"s of suspension lift sitting on 38's.
Now I Kno u can do the front swap to a F150 but again it's not worth it .
I've been reading A LOT these past couple of months on solid axle swap.
Now granted I haven't found any information on a 03 Expedition a probably won't either.
But there are plenty on f150 close to my year and at the end of the day it's all pretty much the same procedure.
I just gotta get some axles and springs drop Shackles for the springs to give me the 8" lift.
Weld up the spring Shackles 4 link the rear and 3 link the front the drive shaft may need to be either modified to work with the rear axle or replaced with something else.
The only thing that I'm not sure on is the steering.
The steering chunk Assembly can't remember what it's called might need to be swapped out to a older style gear box or not.
There was a build up thread on doing a 04 Explorer Solid Axle Swap which will be the closest thing to my 03 Expedition.
But for the life of me I can't find it now.

So i welcome any opinions or feedback on this is appreciated..
Thanks

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How close is your frame to the F-150? Could you get leafs and rear axle from an F-150 to make the rear easy?

The front..... I’m going to assume that will be tougher.

I SAS’d my ‘97 Explorer. It’s pretty awesome now.

ExplorerTom said:

How close is your frame to the F-150? Could you get leafs and rear axle from an F-150 to make the rear easy?

The front..... I’m going to assume that will be tougher.

I SAS’d my ‘97 Explorer. It’s pretty awesome now.

Click to expand...

The rear should be fairly easy
The front is another story the mounts for the leaf springs Shackles will probably have to be welded either on the horns where the front bumper mounts or I'll have to weld a cross member in at the end of the horns and mount the spring Shackles there.
But most likely either way the front axle is going probably sit towards the front not center of the wheel well.
I'm looking for axles out of a 70 model 4x4 Ford truck or an 70 or 80 model 4x4 Chevy truck/Blazer.
I'm going to the junk yard this weekend and see what I can find.


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Axles from a CUCV is what you seek:
Dana 60 front
Corporate 14 bolt rear

Both came stock with detroit lockers and 4.56 gears. Can be had for $750-1k. Shave some off of the enormous rear pumpkin (LOTS of meat, plenty to support). Add a hydraboost brake booster and hoses from any Dura-dud Silverado diesel ($75 at pick a part). Simple install to power steering pump and very minor mods to firewall (IIRC its just the difference in bolt pattern, the rod assembly snaps right in).

Bomb proof drivetrain with amazing brakes no matter what situation you put the truck in.(Especially if you go with any forced induction or radical cams in the future).

I did similiar on my 91 Jeep: 350/700r4/231, 6” spring-over lift, Dana 30/44 hybrid front (44 from Wagoneer with 30 steering knuckles), Ford Explorer 8.8 out back (both with 3.73s, kept stock track width as I didn’t want a foot of axle hanging out each side), hydraboost as described. Stopped Like a go cart with the 38s.

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For the rear, you could also look into a Sterling 10.25. Compared to a 14 bolt, they each have their pluses and minuses, but the 14 bolt needs to be shaved to achieve the same ground clearance as the Sterling with no modifications.

scoot0073 said:

Well over the 4 years of building my Expedition the way I want it for off-roading and now I'm at a point where its gotta get jacked up more.
Everybody says jus sell and get a truck. Well the thing is the Expedition suits my needs for what I do and a truck just isn't what I need or want.
I've done the 3/2 suspension lift fixing to do a 2" body lift. But at the end of the day it's not what I want.
I want 8"s of suspension lift sitting on 38's.
Now I Kno u can do the front swap to a F150 but again it's not worth it .
I've been reading A LOT these past couple of months on solid axle swap.
Now granted I haven't found any information on a 03 Expedition a probably won't either.
But there are plenty on f150 close to my year and at the end of the day it's all pretty much the same procedure.
I just gotta get some axles and springs drop Shackles for the springs to give me the 8" lift.
Weld up the spring Shackles 4 link the rear and 3 link the front the drive shaft may need to be either modified to work with the rear axle or replaced with something else.
The only thing that I'm not sure on is the steering.
The steering chunk Assembly can't remember what it's called might need to be swapped out to a older style gear box or not.
There was a build up thread on doing a 04 Explorer Solid Axle Swap which will be the closest thing to my 03 Expedition.
But for the life of me I can't find it now.

So i welcome any opinions or feedback on this is appreciated..
Thanks

Sent from my Nexus 6P using Tapatalk

Click to expand...

Holly crap!! That's ambitious!! Rize used to make a 6" lift kit for the Expedition but thought I read somewhere that they stopped making them but perhaps you can still find one or make one up (I couldn't but you probably could) . Won't get you to your 8" but close. Just a thought.

This guy posts some notes about using lockers and the Control Trac:
http://www.1lifelive.com/1lifelive-rig-specs.html

ExplorerTom said:

This guy posts some notes about using lockers and the Control Trac:
http://www.1lifelive.com/1lifelive-rig-specs.html

Click to expand...

I've seen some of his videos. He actually refers to the AdvancTrac system as "mimic lockers" because, as he puts it, the system delivers equal power and rotation to all the wheels equally. Lots of comments on his videos of people trying to correct him about his claims about having lockers . I think the 2018 Expedition is the only one that comes with an actual locking rear differential.

Ok, to be 100% honest: this project is an ambitious desire.

But, if you want to do straight axle swaps front and rear here is what I recommend (better be handy with a welder and be able to fabricate some parts):

Leaf springs front and rear; by far the easiest.
Realistically any matched set of axles (same gearing) can be made to work. I recommended the CUCV axles (from military GM vehicles from mid 70s-late 80s) because they fit the stipulations you made earlier (4.56 gears, possible lockers) from the factory. That and they are basically THE coveted factory built readily available off road axle sets. Tried and true, tough and reliable. Only “downfall” is they are 8lug (I say grab some HMMWV rims and tires, bolt right on and gives you 37-12.50 tires). There are several varieties for the rear: full floating/semi-full floating, drum brake, disc brake; but all are built off of the basic 14 bolt platform.

Springs: easiest thing to do is figure out your required amount of lift to clear the tire size you want use, then buy some readily available off-the shelf springs. 80s Chevy lift springs tend to be pretty affordable and easy to find. Once you know what the springs you plan to use are, then you can make your spring mounts for the frame and spring perches for the axles. The spring mounts are typically very simple. Another bonus to leaf springs is that they don’t have to be a perfect 90 degrees to the axle. For example the frame rail is not perfectly straight on the front end, this results in the springs being on angle like this: / \ which is OK and simplifies your install a bit. Obviously you can’t mount the springs at a 45, but not being 90 is ok.

Brakes: i highly recommend a hydraboost brake booster. Utilizes power steering pump pressure to run the brakes. Consistent power especially if you end up on the brakes a lot and you will never run out of vacuum.

Steering: you have a variety of options for steering, you will need to choose one. At a minimum you will have to do some trial and error (or in-depth research over on Pirate) to establish correct pitman arm length, then steering geometry. Basically a bar that goes from the pitman arm to the drivers side steering knuckle. This should be as perpendicular to the axle as possible. You can go to a hydraulic ram style steering, but that will require additional fabrication, parts and plumbing.

Driveshafts: connecting the t-case to each axle requires a driveshaft. Your stock driveshafts are no longer the correct length and cannot be used. Upgrade them while you are building. Since the CUCV driveshaft u-joints are 1350, I recommend just having shafts built with 1350 joints, that way you only have to carry 1 size of u-joint for a spare. There are adapter u-joints that CAN be used, but they are a gamble.

Ensuring all your fabrication, spring mounts and perches are square/plumb/level is THE most important thing. You need to make precise measurements for drilling holes, welding on tabs, etc. because 1/8” off at the frame compounds significantly at the wheel. 1/8” difference is spring mount from d side to p side can result in 1.5” difference at the actual wheel when it comes time to aligning. Nothing will drive you more crazy than having a death wobble of consistent pulling/pushing to one side because of a poorly laid out spring mount.

^makes a lot of good points.

I SAS'd my 2nd gen Explorer. I paid a guy to do it since he had built 4 or 5 SAS Explorers/Rangers previous to mine. It's actually his business. And my skills aren't that good.

But with that said, I've had it SAS'd for almost 4 years now and I'm still working out some issues and fine tuning it. When you drastically change a vehicle from how it came from the factory, it takes some time to figure everything out.

The guy that did my SAS also did a Lincoln Aviator- which is a IFS/IRS set up similar to the 2nd gen Expeditions except in Explorer size.