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elhuberto 07-28-2007 01:20 PM

ford 8.8
i have ford 8.8 axles in my back yard nadi was wondering if theis axles woudl be good in my wrangler i wann run 35's when i do my soa witch is like 50% done


Dare2BSquare 07-28-2007 01:23 PM

Did someone leave them buried there that lived there previously?:eek:

Or, did you buy them specifically for your wrangler?

They should be great for your conversion.

What gears do they have in them?

elhuberto 07-28-2007 01:26 PM

nah i got the m for free off a friend idk what kind of gears they have they where on an exploder if anyone could tell me what gears it had that be a big help

Dare2BSquare 07-28-2007 02:26 PM

Man, some people have all the luck. FREE 8.8's ! ! !

Depending on what year exploder it came out of, my guess would be 3.73's.

1BLKJP 07-28-2007 02:35 PM

It's probably going to be either 4.11 or 3.73. However no matter what it is if you got it for free then if you have to re-gear your front to match then oh well it's worth it.

Running 35's on a D35 is just pushing ones luck. The 8.8 is heads and tails better than the 35. It's as good as going from a D44 to a D60. And they are very easily modified for a leaf sprung vehcile. Spring perches and shock mounts is all you'll need to put on the tubes. If you are going SOA then I'd at the minimum get some good long/strong perches to help with axle wrap. And the optimum thing would be to build an anti-wrap bar.

Dare2BSquare 07-28-2007 02:38 PM


Originally Posted by elhuberto (Post 110247)
nah i got the m for free off a friend

I'm glad you didn't say your were using them to tie out your fighting pit bulls!!! :eek:

kcruisin 07-28-2007 05:07 PM


Originally Posted by elhuberto (Post 110247)
nah i got the m for free off a friend idk what kind of gears they have they where on an exploder if anyone could tell me what gears it had that be a big help

It's easy to figure out what gear it is without looking at the tag on the cover; turn the hub 1 complete rev and count the times the pinion yolk turns.
fyi; a 8.8 with limited slip has a 'weak' pumkin.

4point 07-28-2007 05:27 PM

I copied this from an earlier thread LOTS of info here.

__________________________________________________ __
8.8 Facts, Opinions & How-to's (f.a.q.)

Found this info on the web. Hopefully, it will help someone else too!!

There are many different variations of the Ford 8.8 axle. One of them is best suited for the use in a Jeep and that would be the Explorer (or Mountaineer) 31 spline 8.8. If you have found one off a Aerostar, Mustang, F-150 etc, you should really pass it up and look for a Explorer axle if you wish to retain a similar track width on your Wrangler. Trying to start your build-up with the wrong axle will be frustrating and expensive although you may have picked it up for cheap in the beginning.

Ford 8.8 assembly specs:
Cover bolt 28-38 ft.lbs.
Pinion bearing preload 16-29 in.lbs.
Pinion bearing preload 8-14 in.lbs (used)
Ring gear backlash .008-.015
Ring gear bolt to case 70-85 ft.lbs
Side bearing caps 70-85 ft.lbs.

Explorer 8.8 Measurements:
Weight (complete assembly w/ brakes etc.): 174 lb.
O.D. of tubes: 3.250".
Tube thickness: .250" (some are .188”!)
Ring gear diameter: 8.800".
Ring gear bolts: 7/16" dia. (qty. 10).
Pinion diameter/splines: 1.625 / 30.
Axle shaft/splines: 1.320 / 31.
Rotor thickness (where it mounts to axle is .250").
Overall width 59.625" (the F8.8 is .950" narrower then a TJ Dana 35).
(The F-150 8.8 is drum brake and width WMS to WMS is 65.5”.)
Hole diameter for ABS sensor in top of housing: .811".
Bolt size (U-joint flange to yoke) is: 12 x 1.75 x 30 mm
Centerline of housing to C/L of pinion difference is 3.875" toward the P/S.
Pinion offset: P/S to C/L of Pinion, 27-3/4" (no rotor on axle), D/S to C/L of Pinion, 31-5/8" (no rotor on axle). (this measurement is 2.5" more offset to the P/S then a TJ Dana 35).

Code Capacity Ratio
43 Open 3200 3.08
41 Open 3200 3.27
42 Open 4.10
46 Open 3.73
45 Open 3200 3.55
D4 Limited Slip 3200 3.73
D2 Limited Slip 4.10
L73 Limited Slip 3.73
L - Limited Slip Differential
C - Conventional Differential

How many splines are the axle shafts?
drivers side is 31 spline for 97 & up Mountaineer, 95 & up Explorer, 30-1/2 inch length - 5 X 4.5 inch lug pattern.

passenger side is 31 spline for 97 & up Mountaineer, 95 & up Explorer, 27-5/8 inch length - 5 X 4.5 inch lug pattern

Can I get 35 spline shafts? Yes, with a little searching. Remeber 8.8 axles are used on many different Ford rigs. Mustangs, Rangers, F150s, Aerostar etc... different axle lengths than the Explorer so if you are looking for aftermarket products make sure you are not looking at something for a Mustang that might not fit an Explorer. For the 35 spline stuff check with Mark Williams site. i dont have a link yet but i will soon.

Do I need a slip yoke eliminator? yes

Can I use my drive shaft that I bought for my SYE/Dana 35 set-up? Yes

Is the 8.8 narrower than a Dana 35? Yes but not enough to make a difference when running most aftermarket wheels.1.5" shorter or so. It doesn't matter unless you try running stock rims w/12.5 or wider tires.

Are the 8.8 shafts stronger than Dana 44 shafts? Yes, also the bearings, pinion and ring gear are also much larger.

The axle shaft strength tested by Warn Ind:
F8.8= 6,500 (lb. ft.)
D44= 4,600-5,000 (lb. ft.)
D35C= 4,000-4,300 (lb. ft.)
COT: Continuous output torque rating
MOT: Maximum output torque rating

(Numbers from January edition of Fourwheeler, page 60.)
Dana 35 rear axle COT: 870 MOT: 3480
Dana 44 rear axle COT: 1100 MOT: 4460
Ford 8.8 28spline COT: 1250 MOT: 4600
Ford 8.8 31spline COT: 1360 MOT: 5100
Dana60 semifloat COT: 1500 MOT: 5500]
(thanks joe and Chile99.)

Does the 8.8 offer more ground clearance over the Dana 35 and 44? Not under the differential but the bigger axle tubes lift the rig about 5/8 ".

Is there welding involved? Yes, but the new brackets you put on are much stronger than stock Dana’s. Not a good idea to re use your old Dana 35 brackets

Can I reuse my Dana 35 brackets? Yes, but it is not recomended. The stock Dana 35 brackets are sort of flimsy compared to the beefy aftermarket versions.

Should I weld the axle tubes to the cast housing? I would if it had been salvaged from a wrecked rig. If it is new on a crate (in my opinion) don’t bother.

Will my stock sway bar work? Yes, with a minor modification to a passenger side pinion gusset.

Do all 8.8s come with a limited slip? No, read the tag on the housing or remove the cover. 3L73 = 3.73 gears witha "L"imited slip

Where is the gear break for lockers? There is no break. Same locker for 3.73 to 6.14

Do I need a notched cross pin? Yes for 4.56-6.14 to clear ring gear, or notch a gear tooth.

More cross pin info from NovaTJ:
The 3/4 inch cross pin only fits those rears with the 28 spline count period!
Therefore, the 7/8 inch crosspin is what we are concerned with and it fits Explorer, Mountaineer, F150, and Expedition's with the 8.8 ring gear and 31 spline axles. It also come in those special Mustangs that have the 31 spline axles i.e. Cobra, Steeda, and Rousch.

The axles for Jeep conversion we are keen on are the 96 through 2001 Ford Explorer and Mercury Mountaineer with disc brakes and all that fall into this category with or without limited slip have the 7/8 inch cross pin.

What year ford explorers do I look for as a donor for 31 spline and disc brakes? 1995 to 2001.

What is so great about 8.8? Parts are everywhere, as in axle shafts, covers, brake parts etc..

What's not so great about the 8.8? Weak stock carrier, replace with a carrier type locker like ARB or Detroit (not a lunch box type) this will cure the problem.

Spun axle tubes: Simply weld the tubes into the diff housing before they spin. You are welding to cast steel so now would be the time to ask for a professional's opinion. I have heard of guys tossing the works in a oven before welding, some just go at it cold. Both say their way is right.

Thin stock diff cover: Get some armor.

What kind of locker can I get?

What is the bolt pattern? 5 on 4.5” just like stock TJ/YJ wheels.

Will my Jeep lug nuts fit the 8.8? In most cases, yes.

What do I do with the speed sensor? leave it in place.

Where to buy?
wallysheata, Ariel Performance
to name a few.

How much do they cost? Free to $1500.00 but you can find them new for around $500.00 in their stock form complete disc to disc.

What do I need for a swap into a tj?

-TeraFlex Bracket kit
-U.S. Gears 4.56
-Master install kit (Timken)
-Crane diff cover
-Napa brake line kit P/N 380528 (x2)
-T-hose NAPA P/N 380889
-ZJ E-brake cables (drivers and passenger side)
Mopar P/N 52008904 & 52008905 NAPA P/N 95533 (right) 95322 (left). (not for YJs)
-Driveshaft adapter: Spicer 2-2-1379
-Flange bolts Ford P/N N800594-S100 (x4)
-'03 TJ Rubicon (w/disc) proportioning valve P/N 5083808AA
-3/16" hard brake line about 40" & 18"


From M.O.R.E.
-XJ Installation Kit P/N 98500 84-2001 XJ
-XJ E-Brake Cable Kit P/N EB3 Disc Brake F8.8 Only
-Special Yoke P/N 221379 F8.8 to 1310 U-Joint

From Dealership:
-Mopar spring perches
-Tabs for shock mounts
-ZJ ebrake cables from the dealer (for XJ install)
-Flange from spicer dealer $30 (have seen this go from $20-$50)



Stock brake cables won't come off bracket at tub. Pound a deep 13mm socket on the cable end to compress the fingers holding it in place.

Add gear oil through the abs sensor hole at the top. With an 19 degree pinion angle, I just pour three quarts in and call it full.

To replace axle seals, use the end of the removed axle shaft to pry the seal out.

Axle shaft bearings...remove the seal first as above, then slide hammer the bearings out.

Parking brake shoes can make rotor removal a pain after rust sets in, I always machine the inside lip of the rotor (drum section) about 3/8 inch from the edge to the edge about .030 deep so rust won't interfere by dragging on the shoes.

Old parking brake shoes can have the lining come loose from the metal part of the shoe...reglue with two part epoxy if new shoes not readily available...(it's only a parking brake). Parking brake shoes from Ford...$115 set! Autozone...about $20!
Here is a 8.8 DISC BRAKE HOW-TO from Autozone's website. clicky-clicky...

Rear Caliper Bolts p/n N606046-S60 List $4.10 each (9/06)
Flange bolts P/N N800594-S100 $1.29 (x4) (5/05)

Dare2BSquare 07-28-2007 11:03 PM

Could you repeat that, I missed some of it!!! :doh:

mack4877 04-30-2014 09:22 AM

Hey looking to do this with my jeep and wondering if you went though with it and roughly what the cost and time it took to do so??

StanF 05-01-2014 06:08 AM


Originally Posted by mack4877 (Post 10267130)
Hey looking to do this with my jeep and wondering if you went though with it and roughly what the cost and time it took to do so??

Look here for costs, details, etc:

StanF 8.8 Swap

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