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Discussion Starter #1
I found this URL that convinced me to go with the 9" I have in the rear of my YJ. Thought you all would like the info.

9", D60, D70, D44 compare

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

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That missle proof 9 inch looks incredibly beefy <IMG SRC="smilies/eek.gif" border="0">!!! 1.710" 40 spline axleshafts <IMG SRC="smilies/eek.gif" border="0">!!!
 

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I was at there shop a couple of weeks ago and they are sweet. <IMG SRC="smilies/biggrin.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0"> <IMG SRC="smilies/biggrin.gif" border="0">

They should get the job done and then some...
 

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Discussion Starter #4
ya that 40 spline missle is awsome, but just the comparison of stock 9" vs the 60, 70 and 44 was enough to sell me on that rear-end. So far so good.

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

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Great info!! Only part that I know is BS, is the use of it in the Top Fuel Dragsters. They use a 12" rear end. Who makes it, I do not know, but I know they do not use the 9".

But for our purposes, that is a good article!

Steve
 

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They pretty much tell you that the stock 9" needs a bit work to be brought up to bulletproof status. They also dont mention that the non nodular 9" housings are notorious for bending and breaking, and that you still have an extremely low pinion, which will contribute to high driveline angles and hang down in rock territory. I can only imagine that their missile proof version costs more that an engine swap, just for a rear axle. Shoot Ill take my $300 14 bolt anyday of the week.
 

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Looks good on paper and in most cases the 9" is a very substantial axle. Most of the comparisons in that article are items that also force the 9" to have such a low pinion.

But you wonder why Currie, who specializes in 9" axles now runs a Dana60 in the rear of their ARCA crawler. You know they have all the money and resources at their disposal to build a kickass 9" ..... why did they go with a 60?
 

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Discussion Starter #9
All good opinions, The pinion doesnt hang as low as a 60 and the angle I had to use to turn the pinion up was only 15 degrees and I am running a 2.5" SOA. It really gets down to the way you use your rig. If I want to go to HP 3rd member I can fairly easy. But for now it is definatly doing the job for what I want this rig to do.

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

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The 9" pinion is lower than a D60.
And if you go to high pinion, then its more money and you will be essentialy running 8.8 ring and pinions. Again I would reiterate that the stock 9" housings if they are not nodular housings are notoriousely weak.
The 9" is a decent rear diff assembly,in its best configuration, but I dont care what someoines advertising propoganda tells you, its not as strong as D60 and deffinitely not as strong as D70. Its also extremely expensive in its high dollar versions. There are many junk yard axles that are much stronger, and cheaper. If you are gonna spend the big bucks for a high pinion, the 60 has the best track record of handeling abuse.
 

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Originally posted by H8monday:
<STRONG>The 9" pinion is lower than a D60.
And if you go to high pinion, then its more money and you will be essentialy running 8.8 ring and pinions. Again I would reiterate that the stock 9" housings if they are not nodular housings are notoriousely weak.
The 9" is a decent rear diff assembly,in its best configuration, but I dont care what someoines advertising propoganda tells you, its not as strong as D60 and deffinitely not as strong as D70. Its also extremely expensive in its high dollar versions. There are many junk yard axles that are much stronger, and cheaper. If you are gonna spend the big bucks for a high pinion, the 60 has the best track record of handeling abuse.</STRONG>
i agree with H8. don't draw your conclusion from someone trying to sell thier product. talk to real world wheelers who have been there, done that, and have seen what breaks. i'm not downing the ford 9" cause we all know it is a good rear but for someone to think it is stronger than a d70....well someone has been <IMG SRC="smilies/smokin.gif" border="0"> the ol' crack pipe. i wonder why they didn't include the 14bolt?
 

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Originally posted by H8monday:
<STRONG>And if you go to high pinion, then its more money and you will be essentialy running 8.8 ring and pinions. </STRONG>
Yes, running 8.8 r&p on the coast side of the gears even. <IMG SRC="smilies/eek.gif" border="0">
 

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Another drawback to the nine inch is that the low pinion makes the long gear contact patch between the ring and pinion do a lot of extra rubbing generating a lot of extra heat (probably not a concern for crawling purposes) and costing horsepower.
 

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Discussion Starter #14
Guys, I have a couple of buddies running this application, one with 38's spooled, the other locked, neither have had a single problem. One is even HP, spooled and does the con all the time. I agree with many of the things you all are saying. For my application, I wanted disc brakes strong R&P, and a reliable set-up. I got this rear end fairly cheap, put Dutchman axles in it, yukon gears and a locker. Anyone can break even the most built rear-ends. Depends on the application and how far you are willing to push your rig. I dont get insane, I do have balls though.

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

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I'm sure your 9-inch works fine for your application. My 8.8 works very nicely in mine.

But what you've offered as some sort of axle comparison is really just a company pimping its product. In the real world of four-wheeling, does anyone think a 9-inch is better than a 60 or 14-bolt? Nope.

That doesn't mean it's not a nice axle. I know plenty of guys running them successfully. It's just simplistic to look at an advertising page and think it offers valid axle comparison information. No big deal. Glad you're happy with what you've got.
Dion
 

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Discussion Starter #16
hey blatant, that is all it is, a comparison. Take it for what its worth, run what ever application you think fits your rig. Just thought the info was interesting.
 

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Originally posted by TN Devil Dog:
<STRONG>Great info, looking forward to my 35C breaking so I can upgrade. <IMG SRC="smilies/beer.gif" border="0"></STRONG>

Why wait for the inevitable?
 

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Discussion Starter #19
Originally posted by TN Devil Dog:
Great info, looking forward to my 35C breaking so I can upgrade.
Well I waited 2 years with my 35C to break, and it was fun trying. Good luck with breaking it....ha ha. If you really wanted you could thrash the hell out of it. They probably arent hard to break with allot of go-peddle and big rocks. Actually I am pretty shocked with the abuse it took both with the go peddle and the big rocks.

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