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Old 10-17-2001, 10:54 PM   #1 (permalink)
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Post Pros/Cons of 9"

Considering throwing a 9" under my Cherokee. Pro's/Cons to this axle? Heard they sap a lot of power. Also heard that with a detroit an axle breakage will likely break the detroit. Is an ARB better way to go? Spool? 31 spline spares easy to find?

Thanks for newbie help. Not a <IMG SRC="smilies/rainbow.gif" border="0">
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Old 10-17-2001, 11:17 PM   #2 (permalink)
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A 9 inch is definatly better than any ol D35c that is probably in there now!!! I have never heard of an axle break hurting a Detroit, hell, I can't even remember the last time that I have heard of a Detroit being damaged!!! The 9 inch is one of the best rearends (all around) out there.... Go for it!! <IMG SRC="smilies/bounce.gif" border="0"> <IMG SRC="smilies/bounce2.gif" border="0"> <IMG SRC="smilies/bounce.gif" border="0"> <IMG SRC="smilies/bounce2.gif" border="0">
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Old 10-18-2001, 09:50 AM   #3 (permalink)
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I have the stock 9" in my F150. I broke the stock carrier and put in a Detroit. Personally if I were to do it again I'd throw in a spool. The rearend has held up great and I try to mash pretty hard. Damn easy to take out carrier, only takes about 20min. 9" would be damn near bulletproof in a cherokee, and there are tons at the junkyard.
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Old 10-18-2001, 04:35 PM   #4 (permalink)
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Thanks for the words.

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Old 10-19-2001, 06:29 AM   #5 (permalink)
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9 inch is an awesome rearend, endless after market support, and relatively simple to work on. I say go for it.
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Old 10-19-2001, 07:39 AM   #6 (permalink)
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I just put a 9" under my YJ out of a 76 Lincoln with disc brakes, 4.86 gears and a detroit, here is an article that sold me on the 9"

9" compare

Good Luck
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Old 10-19-2001, 09:20 PM   #7 (permalink)
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Quote:
Originally posted by BlueYJ:
<STRONG>I just put a 9" under my YJ out of a 76 Lincoln with disc brakes</STRONG>
You mean one of these?


What did ya do to the bolt pattern? I'm still trying to decide what to install it in
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Old 10-20-2001, 11:18 AM   #8 (permalink)
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Naaaaahhhhh, to weak for BIG tires. Axle shaft breakage will be continous with larger tires than 36...and a full 100% locker?? Forget it...get something stouter if you will run heavy trails, but might work if done mild off-road only. That is purely my opinion, since I have a habit to break everything ... <IMG SRC="smilies/smile.gif" border="0">
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Old 10-20-2001, 11:46 AM   #9 (permalink)
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Quote:
Originally posted by jr4x4ee:
<STRONG>Naaaaahhhhh, to weak for BIG tires. Axle shaft breakage will be continous with larger tires than 36...and a full 100% locker?? Forget it...get something stouter if you will run heavy trails, but might work if done mild off-road only. That is purely my opinion, since I have a habit to break everything ... <IMG SRC="smilies/smile.gif" border="0"></STRONG>
What are you talking about?

What will break with tires over 36"s?

28 splined axles yah they might break.
31 spline Nah
35 spline like me and a spool never break.
40 spline <IMG SRC="smilies/eek.gif" border="0">
All very easy to swap in.

The housing Nope doubt it'll break.
The only time I've heard of the housing breaking is Highspeed go fast stuff in the desert. A 60 housing will break if you jump and hit something at 75 miles an hour.

Center section with it's double bearing supported pinion, I wanna see one of them walk away from the ring.

What do you run Rockwells?
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Old 10-20-2001, 12:17 PM   #10 (permalink)
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Quote:
Originally posted by Drunken Monkey Boy:
<STRONG>What are you talking about?

What will break with tires over 36"s?

28 splined axles yah they might break.
31 spline Nah
35 spline like me and a spool never break.
40 spline <IMG SRC="smilies/eek.gif" border="0">
All very easy to swap in.

The housing Nope doubt it'll break.
The only time I've heard of the housing breaking is Highspeed go fast stuff in the desert. A 60 housing will break if you jump and hit something at 75 miles an hour.

Center section with it's double bearing supported pinion, I wanna see one of them walk away from the ring.

What do you run Rockwells?</STRONG>

28 and 31 spline axles will definately break, as well as 9" diff.carrier...seen this happen. Well, if you think it this way, 9" was never met to run such a large tires by the factory. My opinion is that, if you wanna run large tires, then get the axles built for them...as I said before...I do not wanna offend anyone, it is just the way I am thinking of. I have seen too many axles to snap and it just can get boring at one moment <IMG SRC="smilies/smile.gif" border="0">

And yes, I am planning to run military truck axles, but not rockwells. Since they are not accecible from Estonia. I have the axles already from Gaz 66, its Russian army truck. Axles have hydro steering, lockers and airing system by the factory <IMG SRC="smilies/smile.gif" border="0"> Oh and 42" high wheels...

[ 10-20-2001: Message edited by: jr4x4ee ]

[ 10-20-2001: Message edited by: jr4x4ee ]
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Old 10-22-2001, 08:29 AM   #11 (permalink)
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Anything can break given enough torque to it. For my application 36's is the largest I am going. I know of 2 other guys running 9" one is even HP and spooled, he is running 38's does the con all the time. Never broken a thing. The other guy is set up almost identical to me 31 spline 4.86 and locked, oh ya and disc brakes. I dont mash the go peddle at the first site of rocks and will take on all challenges within reason. To each his own though. This subject has been debated to death. I am very happy with my set up. My .02 worth.

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Old 10-23-2001, 06:53 PM   #12 (permalink)
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The 9" is a pretty strong axle up to a certain tire size. I have 36's with a 460 for power and mine has held up so far. I have cracked the center section around the pinion support bearing. Another disadvantage of the 9" is how far below the centerline the pinion is. I amswitching to 38's and putting a D70 in.
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Old 10-24-2001, 08:12 AM   #13 (permalink)
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Hey u2slow,

I had dutchman make me a set of 31 spline axles with 5 on 5.5 bolt pattern. I had the rotors redrilled. I am running 4.86's and a locker. My pinion is set at 15 degrees pointing up. I think this is an awsome set up. I had to take the o-ring out of my parportioning valve to get more brake fluid to the rear. It stops my Jeep on a dime. Go For it. FAWK everybody who says the only way to go is D60's <IMG SRC="smilies/flipoff.gif" border="0"> My .02

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Old 10-24-2001, 08:33 AM   #14 (permalink)
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Quote:
Originally posted by jr4x4ee:
<STRONG>Naaaaahhhhh, to weak for BIG tires. Axle shaft breakage will be continous with larger tires than 36...and a full 100% locker?? Forget it...get something stouter if you will run heavy trails, but might work if done mild off-road only. That is purely my opinion, since I have a habit to break everything ... <IMG SRC="smilies/smile.gif" border="0"></STRONG>
<IMG SRC="smilies/eek.gif" border="0"> <IMG SRC="smilies/eek.gif" border="0"> I'd better go get a 60 then. My 38.5 SX's and 31 spline axles with a spool might explode in the parking lot. Please..... I have been all over the Con put amny a street miles on my rig with absolutely no problems. I think the 9" under a XJ would be great.
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Old 10-25-2001, 07:53 AM   #15 (permalink)
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Dito Rockslut, you tell them boy <IMG SRC="smilies/flipoff.gif" border="0"> <IMG SRC="smilies/beer.gif" border="0">

my wife likes my 9" also.

BlueYJ <IMG SRC="smilies/glasses.gif" border="0">
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Old 10-25-2001, 08:40 AM   #16 (permalink)
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Quote:
Originally posted by BlueYJ:
<STRONG>Dito Rockslut, you tell them boy <IMG SRC="smilies/flipoff.gif" border="0"> <IMG SRC="smilies/beer.gif" border="0">

my wife likes my 9" also.

BlueYJ <IMG SRC="smilies/glasses.gif" border="0"></STRONG>

She likes my 9" too! <IMG SRC="smilies/thefinger.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0"> J/K
<IMG SRC="smilies/eek.gif" border="0">

[ 10-25-2001: Message edited by: The Rockslut ]
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Old 10-25-2001, 08:52 AM   #17 (permalink)
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thanks, got the 9" on monday. It has the currie built trussed housing, 31 spline, 4/56s and detroit. For less than the price of just gears and ARB (without the labor), I have a stout rear end that is set up perfectly for XJ. Even has 5 on 4.5 and spring perches correctly positioned. I tore it all down within an hour of having it and all parts a perfect, R&P look brand new.

I will keep my 4.0 and probably never go larger than 36SSR (had to hack majorly to fit 35s). Keep an eye out on Barret, 'Con, and Fordyce for Green 97 XJ with MARNIXJ plate. Will be getting it regularly.

PS-My wifes eyes got very big the first time she saw my 9" <IMG SRC="smilies/redface.gif" border="0">
Then she asked me "How much?"
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Old 12-13-2001, 02:05 PM   #18 (permalink)
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xj w/ stock engine and t-case 9" rear

I have a friend who has a 9" with 4.56 gears and a spool. So far he has broken 3 axles in 3 months. he is running a Q78 swamper TSL

He is changing over to a dana 60 this winter
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Old 12-13-2001, 02:25 PM   #19 (permalink)
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If you do get a 9" make very sure to pay close attention to the welds the hold the tubes into the housing. There have been two guy in our club (one with a '78 Bronco, one using an EB 9" in his CJ), and both of them had the housings start to come apart. In the case of the Bronco it cracked on the trail and finally gave up trying to limp it back home. The guy with the CJ inspects welds for the naval shipyard, and he said the weld quality was crap. On the other hand there are a couple of guys in the club running 9" with 35-36" tires and they haven't had any problems yet. So the point is inspect the housing well.
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Old 12-13-2001, 06:50 PM   #20 (permalink)
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It seems only a few people are considering application here. For a YJ, TJ, or XJ I think the 9" would be ideal. Then maybe get the Warn lock-out kit for the front which you can order w/optional 5 on 5.5" bolt pattern (altho IIRC this kit is spendy).
Now, under a full-size w/V8 power and 38s.... I think you're pushing it. Sure, then you can upgrade to 35 or 40 spline shafts but that's also very spendy. 'Nuf said.
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Old 12-14-2001, 03:08 AM   #21 (permalink)
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My plan is to go with a 9" 31 spline and a mini spool for now.. cheap and easy. then when I get the money, Im going with dutchman 40 spline shafts and a full spool.. that way I KNOW it won't break
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Old 12-14-2001, 08:57 AM   #22 (permalink)
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I agree, to a degree

I agree that the axle tubes-housing can sparate, but only if the person building up the axle places he spring pads wayy off from eachother - pinion degree wise.
But it is also good practice to weld the weak spots up your self... Super Missile Rod at any welder supply, costs 40$ a box of 12 rods, but this stuff is the sheeeat, 100,000 Tensil strenth.
Run a beed arround the tube at each side of the housing.

By the way, if i am just stupid, but isnt the 9" housing a WHOLE steel body ??? why would the tubes separate when its a whole steel body ???

Quote:
Originally posted by onepieceatatime
If you do get a 9" make very sure to pay close attention to the welds the hold the tubes into the housing. There have been two guy in our club (one with a '78 Bronco, one using an EB 9" in his CJ), and both of them had the housings start to come apart. In the case of the Bronco it cracked on the trail and finally gave up trying to limp it back home. The guy with the CJ inspects welds for the naval shipyard, and he said the weld quality was crap. On the other hand there are a couple of guys in the club running 9" with 35-36" tires and they haven't had any problems yet. So the point is inspect the housing well.
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Old 12-15-2001, 10:30 AM   #23 (permalink)
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I run the 9 inch, spooled and 4.88's in a CJ. 360 cu in with more than enough torque. Broke the rear out put of the T-18. But the 9 in w/ 28 spline still holding up.
Side note, I will be trussing it, shaving the bottom 1.5-2 inches and going to a 31 spline, just for any how.
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Old 12-15-2001, 12:54 PM   #24 (permalink)
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while we're on the subject

Ok, I have 28 spline axles on the 9" that I'm putting in. It's an open diff now.
So correct me if I"m wrong.
I can buy a locker for 31 spline or 35 spline, and the only thing I have to change is the axles right? I'm going to have to order new axles eventually anyhow so might as well upgrade. I won't have to change the gears will I?? p.s. the gears are 4:11's and I'm running 35's
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Old 12-16-2001, 08:22 AM   #25 (permalink)
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As far as I know, that is correct, if you buy a locker for 31 splines, you just need to have 31 spline shafts made for your application, from moser, or dutchman or the like. But if you are going to do it, do it right, stick some 35 splines in with a 35 spline detroit. Or spool it. You could go 40 spline, but I believe that requires a new third member built to support the 40 spliners! Me, I'll find a 31 spline or whatever I can get my hands on, and throw a mini spool in it, save for a custom set of 35 splines and a full spool...
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