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Discussion Starter · #1 ·
What would be your preference and why? From what I have learned the 9" if converted to a full floater would be as strong, only draw back would be the low pinion. Just interested in other people thoughts!

9" axle shaft diameter = 1.35" 31 spline
D60 axle shaft is 1.25" 30 spline

Extra pinion support bearing in the 9" is definetly an advantage!


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well my choice is the 9" for these main reasons.

1. huge aftermarket following which means you can get anything you need for one.

2. i am not sure about the rear d60 but my r/c front 60 weighs in at 475 pounds without oil. the 9" ways considerably less.

3. you can get lower gears for a 9" if you really need to. i think they go down to 7.17 or something stupid like that.

4. 9" has a removable 3rd which is really nice to work with plus you don't have to fart around with carrier shims when setting one up.

5. the nice strong 9"s come with 5 on 5.5 bolt pattern so you don't have to run 8 lugs (like most but not all d60s)

6. the 9" has more clearance and if you shave it the clearance is damn close to a d44.

don't get me wrong, the d60 is a great rear end but not my number one choice.

also check out this link for a very good comparison of dana60/70 vs. ford 9" http://performanceunlimited.com/illustrations/gears.html

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'93 sahara ~ SOA w/ tuff country springs, np435, twin sticked d20, d44, 9", detroits f+r, hi steer...and a autometer/CJ dash!!!

[This message has been edited by cornjeeper (edited March 04, 2002).]
 

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I'd go with the 9" for all reasons mentioned above. Love it! Light, strong, and it's a drop out 3rd member type diff. How could you go wrong.

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Superfly
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Originally posted by Lil' blue Yoyo:
I'd go with the 9" for all reasons mentioned above. Love it! Light, strong, and it's a drop out 3rd member type diff. How could you go wrong.
I'm not sure how much stiffer but the D60 housing is, IMO, stiffer than the 9 inch. Plus the pinion angle on the 9 is always worse than on a D60.

...lars



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The removeable 3rd seals the deal for trail repairs. (Not that they ever break!
)

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"You bobbed it how many inches? NINETEEN?!?! Oh my..."
 

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I might be wrong but i think you can get an aftermarket high pinion 3rd member for the 9 inch, does that sound right?

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Originally posted by cornjeeper:
well my choice is the 9" for these main reasons.

3. you can get lower gears for a 9" if you really need to. i think they go down to 7.17 or something stupid like that.


Actually some D60's came factory with 7.17:1 gears. Rare I'd say but there is a listing for them in the Ford/Dana catalogue.

My opinion is if you aren't concerned with ground clearance go with the 9",( I'm talking about driveshaft ground clearance ) but if you want more ground clearance and better driveshaft angles go with the D60.

One thing to add is that a lot of D60's came with 16 spline axle shafts so you might have to upgrade to a least 30 spline shafts to make it worth while.
 

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Originally posted by Baby Joe:
I might be wrong but i think you can get an aftermarket high pinion 3rd member for the 9 inch, does that sound right?

true, but you will be loosing strength. reason is the 3rd memeber uses a 8.8 r/c gear set. also r/c gears are strongest in the front going forward and in the rear going backwards. the opposite is true for standard cut. so the best combo is a reverse cut in the front and standard cut in the rear.

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'93 sahara ~ SOA w/ tuff country springs, np435, twin sticked d20, d44, 9", detroits f+r, hi steer...and a autometer/CJ dash!!!
 

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I read an interesting article a few years back comparing the nine inch third members. It goes to show that not all nine inches are created equally.

There are different materials used with different strengths, including the grey cast iron at 30000psi, factory nodular at 60000psi, Strange nodular at 120000psi and aluminum which I believe was the same strength as the factory nodular. (These are tensile tests of the material not the strength of the housings) There is the factory pinion support with smaller bearings on both ends and a pocket bearing, a daytona pinion support with a thicker bearing on one end plus the pocket, and the all out race support with two thicker bearings and the pocket (for racing only due to lack of oiling chambers).

I guess it comes down to cost. With enough money, you can build a near indestructible nine inch, that would have equal or greater strength than a 60 and be lighter, but is probably more valuable in racing where less weight and high strength is more crucial than in offroading. But it is still nice to know that the parts are out there if you ever crack a third member.

Chris
 

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I am having this exact same dilemna. There is a super in depth article about the 9" in the aplril 2002 issue of Four Wheeler. I just read it and it compares dana 30 pieces and dana 60 pieces, also includes Currie's high pinion design. Lots of useful info. Check it out. I'm still undecided. It will prolly come down to which one is cheaper!


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Discussion Starter · #11 ·
Some D60 rears also came with 35 spline 1.50 inch axle shafts, but I am not putting this diff into the comparo!

It was a while back that I made the comment quoted from an article on the internet that said the 9" is equal in strength to a D60 only to get burned by it. I just wanted to see if I would get the same response!


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[This message has been edited by desteurm (edited March 04, 2002).]
 

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1. I saw a nine inch break before my very eyes and he was only runnin 35's.
2. I dont think you can even begin to compare strength between a 60 and a 9".
3. Ive never heard of a 60 with 35 spline axles unless a 70 axle was used wich means 70 tubes ! Correct me if im wrong.

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I wouldn't say that a stock nine inch is as strong as a stock Dana 60, but with the huge racing aftermarket following, the nine inch is easily upgraded. 31, 35, and 40 spline axles are all available.

I have a factory nodular third in mine with a daytona pinion support. It came out of a 400 hp ford fairlane with racing slicks. He ran about 150 1/4 mile passes with it. The ring and pinion were wore down as racing often does, but he never broke it. This is proof enough for me of the nine inch strength.

Chris
 

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Originally posted by MuddMachine:
1. I saw a nine inch break before my very eyes and he was only runnin 35's.
2. I dont think you can even begin to compare strength between a 60 and a 9".
3. Ive never heard of a 60 with 35 spline axles unless a 70 axle was used wich means 70 tubes ! Correct me if im wrong.

60's were offered with 1.5" 35 spline shafts, and they would be way stronger than any 9", In my opinion I would not waste my money building anything other than a 35 spline 60, anything less is retarded. I built a set of 44's just to realize 6 months down the road that I should have went bigger, even though all I wanted to run was a set of 33's. I'm a little bias too, the only ford thing I like are the shock towers.
 

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Ok, now my side of the story. I've seen a guy in a cruiser blow two 60 rears, running 33s-how's that for a comparison. In the end it depends on how much power your putting through it. A 9" will take the majority of wheelers a long way. I know a guy who has a funny car (1500 hp) and he uses a spooled and shortened 9". It's all about how they're built.

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89 Toy p/u, locked rear, 4.3l on propane, still ifs. Work in progress
 

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Discussion Starter · #17 ·
I think that if you are running 35's with 4.56 gears you will eventually break or twist any shaft, consider this...the torque multiplication of the ring and pinion, the lower you go the more stress you put on the axle shafts.

I just don't understand how a Ford 9" 1.35" axle shaft can be weaker than D60 1.25" axle shaft that just doesn't add up guys.

The pinion position is a draw back on the 9 but everything has a drawback. But at least the extra pinion bearing on the 9 inch prevents deflection similar in design to the 14 bolt, right?

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Discussion Starter · #18 ·
Originally posted by NOYFB:
I'm a little bias too, the only ford thing I like are the shock towers.

So you wouldn't want to have a Ford R/C D60 front axle...paleease
...as I understand it nobody else used this axle in their pickups!

Right?


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Originally posted by desteurm:
So you wouldn't want to have a Ford R/C D60 front axle...paleease
...as I understand it nobody else used this axle in their pickups!

Right?


it is not built by ford, its dana. I found one at he wreckers too, I was considering converting it to a rear but I don't have an extra $400 to pick it up.
 

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Discussion Starter · #20 ·
Originally posted by NOYFB:
it is not built by ford, its dana. I found one at he wreckers too, I was considering converting it to a rear but I don't have an extra $400 to pick it up.

Under the requirements of the Ford Motor Company, Dana built the axle to Ford's specifications!!! This is how it works, Ford will send a tender to Dana asking for an axle with specifications for GVW, Pinion position, etc...and the axle specialists, Dana, will go "OK" and redesign the axle, based on this, Ford pays for the re-tooling and these items now become the property of Ford!

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