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Old 01-19-2009, 07:45 PM   #1 (permalink)
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Differences between Dana 80 and 70??

Axles are the same size... so whats the major differences? Carrier size? spider gears? I blew up my 80, and i cant find any replacements except for 70's so i might have to go that route, but before i do that i want to know what the differences are.
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Old 01-19-2009, 08:35 PM   #2 (permalink)
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The better question would probably be what broke in your 80? It is quite likely that it will be cheaper to fix what you have unless complete axles are fairly cheap in your area.

The ring gear diameter is probably the most obvious difference between the two axles...
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Old 01-20-2009, 12:52 AM   #3 (permalink)
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according to my manual, the ring gears are the same diameter. My spider gears came apart in my posi in my 80, and took out my gear set, bearings, etc.. and the housing is distorted from gear pieces jamming up between the carrier and the housing itself.
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Old 01-20-2009, 12:58 AM   #4 (permalink)
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i thought it was just the newer duallys that had a dana 80
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Old 01-20-2009, 01:08 AM   #5 (permalink)
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Ring gear diameter is larger, spline count on the Dana 80 is 35, many 70's are 32 spline. Housing is bigger, I think bearings and pinion input is bigger. Basically everything is bigger. My manual doesn't specify, but you can look up the two axles on Ring And Pinion Gears, Axles and Axle Shafts, Drivetrain Parts and Tools - Accu Auto Parts they have the applications, and some of the sizes. If you have info that lists them as the same size/strength, the source is wrong, or something is getting confused.

The newer duallies get an AAM axle, which, I think is comparable in strength. edit; Oops, newer than his... That's what I thought, too. Except for the 3500srw's that got the '80.

As to the damage to the carrier/housing, as long as everything still lines up, and nothing is cracked, you can still use it. It'll be ugly, but usable. That sounds pretty savage, though. I'm surprised you didn't (?) waste some teeth off your R&P. Might take a REALLY close look at all your timkens, if possible. Do some fishing with a magnet inside a sandwich bag, too.
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Old 01-20-2009, 01:26 AM   #6 (permalink)
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Axle 70u 80
splines 32 35
ring gear 10.5" 11.25"
pinion splines 29 37
pinion shaft 1.75" 2"
etc. etc.
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Old 01-20-2009, 09:35 AM   #7 (permalink)
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how bad is the housing?

parts are available at Randy's Ring & Pinion
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Old 01-20-2009, 01:17 PM   #8 (permalink)
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Quote:
Originally Posted by stevezcummin View Post
according to my manual, the ring gears are the same diameter. My spider gears came apart in my posi in my 80, and took out my gear set, bearings, etc.. and the housing is distorted from gear pieces jamming up between the carrier and the housing itself.
I'm guessing that the manual has an error in it then, because the ring and pinion certainly are not the same between a 70 and an 80. Also, as was said, axle spline count on the newer Dodge stuff is typically 32 spline on the 70s and 35 on the 80s. There are 35 spline 70s out there though, just not in this application.

Sounds like you have a pretty well screwed axle that is going to cost some money to fix. A complete swap would likely be cheaper.

Quote:
Originally Posted by totalloser View Post
As to the damage to the carrier/housing, as long as everything still lines up, and nothing is cracked, you can still use it. It'll be ugly, but usable.
x2.

I would be concerned about the case distorting based on the description of what happened though. I've got a buddy who had a distorted case (even though it looked perfect) and couldn't keep an ring and pinion in it after the first one grenaded.

Quote:
Originally Posted by Rollin Coal View Post
how bad is the housing?

parts are available at Randy's Ring & Pinion
x2 on Randy's. They are a good source of parts if you choose to go the rebuild route. They are very knowledgeable about this stuff which is important since not all Dana stuff is the same. I believe this applies more to 70s than 80s however...
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Old 01-20-2009, 04:14 PM   #9 (permalink)
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Quote:
Originally Posted by CumminStrokeThis2001 View Post
i thought it was just the newer duallys that had a dana 80
Nope, the newer trucks dont even use dana axles, they use aam's

I believe its more common to find a D70 in automatic trucks and D80s in the manuals and 1tons
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Old 01-28-2009, 06:36 PM   #10 (permalink)
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the housing is done... not going to chance re-using a damaged part that nothing will line up with. I had to PRY my axles out of the diff at the ends, and the carrier FELL out once i took the main bearing caps off.... thats bad.

I picked up another 80, just going to build it up the way i want.... i just need find out who makes a selectable locker for it with 4.10 gears, arb only has 3.73 and down for the 80
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