Swapping in a dually axle

[30backs]

So I have a 1988 chevy r20 with a 14 bolt srw in it. I recently picked up a dually axle out of a 1980 1ton to swap in. I believe the axle is a Dana 70 but not positive. What's the best way to identify this axle? Also if it is a Dana 70 what type of diff fluid to I run in it?

 

[towjoe]

if it's the wide dually axle for dually pickup it will be a dana 70. if it's the narrow dually rear end for cab and chassis its a 14 bolt like you have but narrower. look at space from spring perches to backing plates to notice. also a dana 70 is beefer looking than a 14 bolt and the front pinion doesn't bolt in like the 14 bolt does

 

[HotRodPC]

Gonna have to relocate spring perches and shock mounts too.

 

[30backs]

ok then must be a dana 70. My shock mount and spring perches are already in correct location as my r20 seems to have the same width frame rails as a one ton for some reason. what weight rear end dope should I run in it?

 

[nvrenuf]

All square bodies have the same width frame rails, it's the spring hangers that are different widths between a 1 ton and others.

Your shock mounts should also be in opposite locations from the d70hd.

 

[HotRodPC]

All square bodies have the same width frame rails, it's the spring hangers that are different widths between a 1 ton and others.

Your shock mounts should also be in opposite locations from the d70hd.

Yep !!!

Maybe some pics of these axles, and we can you help you ID what you have. Noway is a D70HD going to bolt right into a 3/4 ton Burb.

 

[30backs]

its not a burb it is an cclb

 

[30backs]

I want to load some picture but cant seem to do it form my iphone or ipad. I can try to give you a better description it has a sway bar and the cover kind of reminds me of a dana 60 front cover with a fill plug.

 

[nvrenuf]

Wait, a crew can changes everything. Iirc, ALL crew cabs use a 1 ton frame so the spring spacing should be correct for the d70hd.

 

[30backs]

all the measurements I have taking look correct for it to fit.

 

[HotRodPC]

its not a burb it is an cclb

Ohh yeah. Big difference. In the Crew Cabs, Even the 20 aka 3/4 ton crew cabs are on 1 ton frames so I'd imagine it would also have the 1 ton spring hangers too. So you're going from a SRW CCLB, to a DualRW CCLB right?

Makes a bit more sense now knowing that. I misunderstood. I think someone else is working on a dually into a Burb or has asked about it recently.

 

[30backs]

No problem what weight oil would you run in a Dana 70 hd?

 

[30backs]

got the axle swapped in Friday evening it went good had to shorten driveshaft a little. Does anyone know where to find new bushing for the rear sway bar set up?

 

[nvrenuf]

Once upon a time, I got some from energy suspension but I think I had to match up the dims to their universal stuff.