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Old January 20th, 2007, 09:22 PM   #1
greenmeanie
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Default ford 8.8 or dana 44?

what should i put in my yj wrangler?? i have the 44 already, and was planning to put disk brakes and some sort of a locker in it.

should i just buy an 8.8 w/ disks and a factory lt'd slip instead of building the 44??
that seems like it would be a better investment; just want some other opinions. thanks.
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Old January 21st, 2007, 12:14 AM   #2
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8.8 is stronger and already has disc brakes on it. I think it would be cheaper than the 44 with discs. The 8.8 limit slip is pretty pussy though so you might still want to put in a locker of some sort. If you do ever want to put an lunchbox in it, make sure the 8.8 is open because you can't put a lunchbox in the limited carrier. My 8.8 cost me $550 to get under my jeep and then I put an aussie in it for $289. So a bit over $800. You'd probably spent 100 already for the 44 plus the disc brake kit $400, plus bits and pieces (brake line, perches, shock mounts) to install it $100. then the same $289 to lunchbox it. So maybe it would be about the same but you'd still end up with a less strong axle. In my opinion, the only downside to the 8.8 that can't easily be fixed is that it is heavy and has a tendency to catch shit because it's got a fat lower lip.

Last edited by sodapop; January 21st, 2007 at 12:19 AM.
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Old January 21st, 2007, 07:06 AM   #3
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I'm still not sold on the "8.8 is stronger" Bandwagon. I have sold over 30 JY D44s now, and have never had one with a bent axleshaft. I have sold about 10 exploder 8.8s, and have already had 3 bent axleshafts. That is not counting the 2-3 exploders I see with broken shafts every time I'm in the JY. I have stopped selling 8.8s just because I'm not sure if I will end up with one with a bent shaft. I have never come across an XJ D44 with a broken shat in the JY.
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Old January 21st, 2007, 07:43 AM   #4
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Quote:
Originally Posted by Cooter View Post
I'm still not sold on the "8.8 is stronger" Bandwagon. I have sold over 30 JY D44s now, and have never had one with a bent axleshaft. I have sold about 10 exploder 8.8s, and have already had 3 bent axleshafts. That is not counting the 2-3 exploders I see with broken shafts every time I'm in the JY. I have stopped selling 8.8s just because I'm not sure if I will end up with one with a bent shaft. I have never come across an XJ D44 with a broken shat in the JY.
8.8 shafts do tend to bend, for some reason, that is true. i bent a 31 spine one in my truck after powersliding right into a curve.
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Old January 21st, 2007, 08:20 AM   #5
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Quote:
Originally Posted by greenmeanie View Post
what should i put in my yj wrangler?? i have the 44 already, and was planning to put disk brakes and some sort of a locker in it.

should i just buy an 8.8 w/ disks and a factory lt'd slip instead of building the 44??
that seems like it would be a better investment; just want some other opinions. thanks.

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]
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Old January 21st, 2007, 08:22 AM   #6
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Quote:
Originally Posted by JeepRat View Post

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]
Something seems to be skewed in those numbers.
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Old January 21st, 2007, 08:33 AM   #7
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Those numbers are strength before breaking, they say nothing about bending, twisting, or shock loads.
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Old January 21st, 2007, 08:57 AM   #8
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im not sold on the 8.8 eather, we have a couple of guys up here that wheel them every weekend and break them often.
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Old January 21st, 2007, 10:33 AM   #9
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D-44 30 spline, 8.8 31 spline. Its all about the alxe diameter when looking at torsional load. The larger of the two will do better under any loading.

If your buddys are bustin 31 spline 8.8's have them put a D-44 in and see how it does. Other than doing that just saying they bust them does not compare the two.
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Old January 21st, 2007, 10:54 AM   #10
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Quote:
Originally Posted by Cooter View Post
Those numbers are strength before breaking, they say nothing about bending, twisting, or shock loads.
I can tell you the larger the shaft diameter the less it will be.

Theta = TL/GJ

Theta = angle of twist
T = torque
L = lenght
G = modulus of elasticity
J = polar second moment of area^2 = (pi/2) X (r^4,0 - r^4,i)

Keeping the torque, lenght, and modlus (material property) constant the only thing to change is J. This value is dependent on diameter. The larger the diameter the larger J is. So all others constant a number divided by a larger number yeilds a smaller number, thus the angle of twist.

Also the way to test materials is the failure, this gives you the proper stress VS strain graph to get the modulus of elasticity, modulus of rigidity, as well as other material or part properties.
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Old January 21st, 2007, 11:01 AM   #11
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Quote:
Originally Posted by Todd View Post
D-44 30 spline, 8.8 31 spline. Its all about the alxe diameter when looking at torsional load. The larger of the two will do better under any loading.

If your buddys are bustin 31 spline 8.8's have them put a D-44 in and see how it does. Other than doing that just saying they bust them does not compare the two.
yes i know
i guess i should have added that i was running a 44 rear on my 5 for 4 years wthe a set tires that have now been REcut twice and now live at the end of 1 of the 8.8s that keeps suffering breackage with alot less hp or gearing or milage. and ive acounted for driver style. (i wheel w/these guys a-lot!)

or that my observations (all of them) come from 20 years of wheeling an average of three times a week with many dif. rigs/setups tire sizes ect
with many many dif. people in may dif. terains and conditions.

or that ive built, with hours to many to count spent on resurch and thought)
the last 4 very compitent rigs ive owned and work on/helped build most of my close friends rigs.

or that im not dending 44s cuz i run one. i run a 78 9" in the rear of the new rig cuz from what ive seen its about the best light wieght axle in stock form
that is easily avalible.

but i didnt feel like typing all of that.


ive been seeing them have problems lately and it makes me not trust them as much as i used to
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Old January 21st, 2007, 12:04 PM   #12
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i have 35x15.50x15 super swamper sx's. i also have 5x4.5 rims which the tires are already mounted on.
$75 for the wheel adapters so i can use my rims
+-$120 for the disk brake stuff
$225 for an aussie
$110 for the gears i need

$530ish for the total on building the 44.

would it be worth trying to find an 8.8 w/ disks/lt'd slip?? i could probably build one of those cheaper i think.
w/ the 31 splines, the 8.8 should technically be stronger right?? (i know twist/load will be a factor)
i have a 258 w/ a offenhauser intake, weber 400cfm carb, HEI ignition this spring (in other words, not a huge v8); does that change anyone's opinions??
also, does that 8.8 factory locker compare to say a truetrac??
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Old January 21st, 2007, 02:33 PM   #13
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I still stand by my 8.8 comments. On top of that shafts being bigger and stronger, the ring gear is bigger and so is the pinion shaft. In the end either choice would be a good one, the 44 and the 8.8 would be gooc choices for 35" tire size.
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Old January 21st, 2007, 09:03 PM   #14
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The 8.8 is bigger in almost every dimension than a d44. That said I have had both and broken neither.

Currently running a 62" wide 44 with a welded stock carrier, 5.38's and stock shafts. I think I have about $150 into my disc brakes including new calipers, discs, pads, caliper mounts, and hoses. A lot bigger brakes than an 8.8. though. Running 36" SX's with no breakage yet.

I even had the rear lockup at 40 MPH because of oil starvation (my fault) with no shaft or gear set breakage.
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Old January 22nd, 2007, 09:43 AM   #15
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so; probably stick w/ the 44 since i already have it??

what calipers/rotors did you put on the 44 monkeyevil?

people have suggested nissan calipers w/ sidekick rotors, since the nissan cal's have an e-brake attatchment.

Last edited by greenmeanie; January 25th, 2007 at 08:05 PM.
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Old January 28th, 2007, 12:42 AM   #16
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I'm running the Chevy midsize calipers. I can't remember the application off hand...
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