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Dana 80/70 Swap????

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Old 04-29-2007 | 07:50 PM
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From: Eastern Shore of Maryland
Originally Posted by ctd89-99
Brett, What did you break the R/P or the spider gears ? Thanks Steve B.
Snaped the pinion off again sledpullin last weekend

See you got some new #'s, you change anything?
Old 04-29-2007 | 08:13 PM
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From: Gibsonia,Pa. 20 miles north Pittsburgh
No same stuff I had last fall.
Old 04-30-2007 | 12:01 AM
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If your new rear has a different speed sensor in it, you can just swap it with your old one. It is just one bolt that holds it in. I have a 98 axle in my 94, I had to swap sensors because the plug was different and I don't have any warning lights and the rear ABS works fine.
Old 04-30-2007 | 12:00 PM
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I think i need one out of a 2000 or 2001 with the drum breaks cause the 99 and older have didferent stering componets so they had to change the offset of the wheels front and back.
Old 04-30-2007 | 06:45 PM
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Are you sure?

I don't think the stock chrome/steel wheels on my '98 have different backspacing...
Old 05-01-2007 | 07:57 PM
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Originally Posted by dzlfarmboy
I think i need one out of a 2000 or 2001 with the drum breaks cause the 99 and older have didferent stering componets so they had to change the offset of the wheels front and back.
That's not correct. The WMS to WMS measurement on the axles is all the same, unless you get one from a dually. They just use spacers up front, but we are talking about rear axles, so that and the steering have nothing to do with this problem. But, the steering "components" do not change. There are a couple of different options with the steering throughout the years from 94 to 01, and depending on if the truck is a 1500, 2500, or 3500, but it is basically all the same. Where the tie rod connects to the knuckles, there is a lot of room in between them and the wheels. The steering does not affect how much backspacing is needed on the wheels.

There are a lot of different wheels available, too. I always figured that they had the same backspacing, but come to think of it, I'm sure there are different figures for each wheel. Some are 7 inches wide, some are 8 inches wide. The backspacing would change depending on what set of wheels a person was running. But again, the axle width never changes, unless you get one from a dually.

That axle from the 98 will work just fine. I'm running a 98 Dana 70 in the rear of my 01. ;-)

XLR8R, it's kind of easy to remember this. 2500's with an automatic get a Dana 70 (except for the V8's, which get a 60 rear no matter what, but screw them). 2500's with a manual get the smaller Dana 80.

I forget exactly how the 3500's work. I "think" that the autos get the smaller 80 and the manuals get the bigger 80, but since all 2nd gen 3500's are duallys, then another part of me thinks that they all run the bigger 80. So I'm not totally sure on the 1 tons but maybe somebody else will know fo sho.
Old 05-01-2007 | 08:15 PM
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Originally Posted by Bammers
The Dana 80 uses an 11 inch ring gear and the Dana 70 uses a 10.5 inch ring gear. The internals aren't all that much bigger, but the housing on the Dana 80 is gigantic. You basically get a D80 center section with D70 tubes. It's not a "true" Dana 80 but it's definitely big enough. Weight ratings remain basically the same, torque input is about the same. Going to a stock D80 is a slight upgrade in strength.
Originally Posted by signature600
Only with a dually...with a manual/SRW truck, they are the same size
Chris
Originally Posted by Bammers
XLR8R, it's kind of easy to remember this. 2500's with an automatic get a Dana 70 (except for the V8's, which get a 60 rear no matter what, but screw them). 2500's with a manual get the smaller Dana 80.

I forget exactly how the 3500's work. I "think" that the autos get the smaller 80 and the manuals get the bigger 80, but since all 2nd gen 3500's are duallys, then another part of me thinks that they all run the bigger 80. So I'm not totally sure on the 1 tons but maybe somebody else will know fo sho.
Bear with me here, guys!

At the moment, I'm only concerned with the axle tube size on the 2nd gens.
I know the autos get the D70 tubes, while the manuals get the D80 tubes (also, the V-10 auto gets the D70).

The choice of third member flavors is:
D70 (small tubes, 10.5" ring)
D80 (small tubes, 11" ring)
D80 (big tubes, 11" ring)

When you say the manual 2500s get the "smaller" D80 - which part is small?
It's not the tubes on the trucks I've seen! Are there 3 different tube sizes?

... and does anyone know for sure how the 3500s differ in this?

Thanks!
Old 05-02-2007 | 12:43 AM
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i have an 02 2500 with manual tranny and i have the big axle tubes on my 80. i think the only difference between the 80's is the SRW and DRW width
Old 05-02-2007 | 12:58 AM
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Yeah, all 80's use the same center chunk, just different tubes. I was saying the smaller 80's have the smaller tubes. The bigger 80's have the man-sized tubes. Those bigger tubes mean it has a higher weight rating, which denotes the difference between a 3/4 and 1 ton. 1 tons have a higher weight rating.

As far as I know, there are only two tube sizes. A quick check for U bolt applications would let us know for sure. I know when I've ordered lifts, you have a "standard" U bolt size and then a larger U bolt size.

It doesn't make sense that a 3/4 ton would have the 1 ton tubes, but then again, we ARE dealing with Dodges here... there is a lot that doesn't make sense.
Old 05-06-2007 | 09:16 AM
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Originally Posted by Bammers
...The Dana 80 uses an 11 inch ring gear and the Dana 70 uses a 10.5 inch ring gear. The internals aren't all that much bigger, but the housing on the Dana 80 is gigantic. You basically get a D80 center section with D70 tubes. It's not a "true" Dana 80 but it's definitely big enough. Weight ratings remain basically the same, torque input is about the same. Going to a stock D80 is a slight upgrade in strength.
May be "slight upgrade in strength" ...but giving up a Powr-Lok for a Trac-Lok LSD.

I had my Dana 70 out this weekend and was pleasently surprised to find a Powr-Lok LSD, which by all reports on the DTR was dropped by Dana in 1998. Appears that only true for the Dana 80's.
After seeing very little wear (125,000 miles) and finding the much prefered Power-Lok limited slip, I no longer have "rear end envy" for those with the 80's.

RJ
Old 05-06-2007 | 01:50 PM
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Originally Posted by RowJ
I no longer have "rear end envy" for those with the 80's.

RJ
dood are you allowed to say that?
Old 05-14-2007 | 06:18 AM
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i swapped a '95 dana 80 dually into my '01 ...

everything works fine ...

had to move the pass side shock mount though ...

abs and speedo work perfect ...

upgraded to the larger chevy brake cylinders as well ...
Old 05-14-2007 | 06:28 AM
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Originally Posted by 2broke2smoke
i swapped a '95 dana 80 dually into my '01 ...

everything works fine ...

had to move the pass side shock mount though ...

abs and speedo work perfect ...

upgraded to the larger chevy brake cylinders as well ...
Do your tires stick out more than they did before?
Old 05-14-2007 | 07:04 AM
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Originally Posted by RowJ
May be "slight upgrade in strength" ...but giving up a Powr-Lok for a Trac-Lok LSD.

I had my Dana 70 out this weekend and was pleasently surprised to find a Powr-Lok LSD, which by all reports on the DTR was dropped by Dana in 1998. Appears that only true for the Dana 80's.
After seeing very little wear (125,000 miles) and finding the much prefered Power-Lok limited slip, I no longer have "rear end envy" for those with the 80's.

RJ
why have problems with dana 80's or 70's when you have a full spool to fix the problem!!!
Old 05-16-2007 | 06:29 AM
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Originally Posted by dzlfarmboy
Do your tires stick out more than they did before?

nope i got a quad cab dually ...

so it's 1" narrower per side ...

we had a cab/chassis, regular bed dually and srw all laid out on the floor in a row

the c/c was 2" narrower OVERALL than the srw, which was in turn 2" narrower overall than the regular bed dually axle


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