D80 vs GM14 bolt

SEOHPowerstroke said:
Personally, I wouln't ever want to run a welded up rear end. When the spider gears go, so does the whole carrier, then you are back to square one.....Plus I think you need that little give that the locker provides before it locks when running at those tighter tracks.

Also, the locker is said to be more durable than a weld-up, and I guess we'll see soon if the axles will hold. 800hp should be at about half throttle.
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So your gonna run 1600HP through this setup?? There are several guys already that are blowing pieces up on the AAM. I agree the welded setup is not for the street. When one thing gives a little, it forces the power to go somewhere else.
Which can result in less distance, and possibly something broken. I know of a guy running about 800HP in his big block pulling. He has had issues with his 14 bolt. He welded the bejesus out of to strengthen it up.
 
The D80 is what a lot of guys around my area run. Holds up well to around 800hp. Moser will make whatever axle you want. All you have to do is give them dimensions. Also SCS will do the same thing and seem to be a little better, but that comes with a price too. JMO.
 
I have seen a Super80 from someone, it was ARB I think. Had increased case material, and tubes were thicker. It was like $8000 or course it had a locker in it.
 
JOHNBOY said:
What I have heard about the Mosers is that they don't hold up as well as stock.

The advantage the Dana 80 has over the AAM 11.5 is it can have much larger actual shafts. You can get 37 spline shafts in an 80. Where as the hub limits the size of the shaft in the AAM. 35spline is about as big as you can IIRC.
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The reason the Mosers don't hold up is because they don't do there own in house forging. They buy premade axle forgings that are close to finish and already induction hardened. The problem is when they machine them to finish size, they cut away the heat treated material in the corner where the axle meets the flange. This is typically where the Mosers are breaking.

If the same spline pitch (20/40) is used for aftermarket axles, they can't be any larger that the stock 30 spline. Now if a smaller pitch is used, the spline count can be increased. The spindle bore on the AAM 11.5 is 1.580" for what it's worth.
 
dmaxlover said:
The reason the Mosers don't hold up is because they don't do there own in house forging. They buy premade axle forgings that are close to finish and already induction hardened. The problem is when they machine them to finish size, they cut away the heat treated material in the corner where the axle meets the flange. This is typically where the Mosers are breaking.

If the same spline pitch (20/40) is used for aftermarket axles, they can't be any larger that the stock 30 spline. Now if a smaller pitch is used, the spline count can be increased. The spindle bore on the AAM 11.5 is 1.580" for what it's worth.
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Thanks for the explaination on the Mosers John.

I am aware of the 1.580 bore. You got me on the 20/40 pitch thing. I dont have a machinist handbook at home. I will have to look that up. I am used to spinle pitch being refered to as one number like thread pitch. The 1.58 is the real hold up. We can go to better allloys like 4340 or 300M but the improvement in strength will not be great. Going to a bigger over all size would really help but is out of the question with AAM 11.5.

(20/40) 20 pitch 40* pressure angle?
 
45 deg pressure angle with full root radius. If the pitch is made to 24/48, a 36 spline axle will fit.
 
Dana 80's came in diesel manual trans Dodges since 94, diesel auto trans Dodges since late 90's, all Dodge duallies since 94 until the switch to AAM axles in 2003. I'm not sure of other applications (maybe Ford F450 used them) or the exact specifics of the Dodge applications. Chevy has always used in house/AAM axles in the rear (except for duallies in the mid 80's which used Dana 70's). I think Ford only used the Sterling 10.5" rear in there 250 and 350 applications with the Powerstroke.
 
and there are plenty of hop-up parts for the D80 to hold substantial horsepower (700+rwhp & 1200+rwtq)? how much are bigger badass shafts? how much is a locker?

Where does a Ford 9" come into this, strength-wise? Are they or can they be made to suit the bill? I now they are popular in drag racing gassers and maybe even some pulling trucks but I simply don't know much about them...


c-ya
 
SmokeShow said:
and there are plenty of hop-up parts for the D80 to hold substantial horsepower (700+rwhp & 1200+rwtq)? how much are bigger badass shafts? how much is a locker?


c-ya
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Yep. We have a "locker" here

And 37 spline axles here

I was putting down over 750 or so last year with Haisley 2 piece 35 spline axles and a Detroit locker with no axles issues, but I'm stepping up to the above linked parts this season.
 
Not correcting you SChandler, just adding to the list.

Dodge's that have Dana 80's.
94-02 Dodge 2500 trucks with diesel and 5/6 speed manual trans
94-02 Dodge 3500 trucks
 
Bobcat,

I was hoping someone would fill in the blanks, I was just getting the flow of info started for SmokeShow.
 
Which body change did GM go to the 11.5" 14 bolt rear?? (What year was the change..)
Thanks,
Bryan
 
some 88-00 1 ton chevy's both single and duallies used the dana 80 and almost all 73-87 3/4 ton and 73-89 1 tons both single and duallie used the 14 bolt ff some duallies used the dana 70 but i dont think it was very many. the dodge is the best source to find a dana 80
 
I have never seen a 14bff 10.5 break unless someone had the axles bound w/ 44 or biggers tires they are tuff

But the d80 is stronger and those 37spline axles are nothing anymore when you can get 1 3/4 diameter 41 spline shafts
 
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