I'm getting a 1 ton rear axle off of a 1984 c30 with dual rear wheels. Is this axle narrower then most? Will I have a problem putting this on my truck because it is narrow? Thanks in advance.  

Depends on what you got it off of. If it is off of a stake bed, you will have problems (the frame width is ok but the wheel tubs in bed are not)if it is off of a dualie P/U it will fit right in a like model truck.  

It is off of a 1984 c30 with a utility bed. Thanks.  

You could always put in some wide wheel tubs and make a custom job of it. It would be different than a regular dualie and not have the wide clearance problems of a regular dualie either.  

I dont have the axle yet so I cant go measure it. Do you know where I could get the measurements for it? I think its a D70. Thanks snoman.  

Which measurements? The spring pads will be okay in a like body style P/U, it is just the wheel tubs. You need about 6 inches more clearance in them or about 38 inches between tubs side to side will work.  BTW, it should be a Dana 70 but it could be a 14 bolt too in that madel year but a D70 would be my first guess.

Thanks for the measurements, So the only problem that I could run into is the wheel wells not being big/deep enough? I also heard that I would need to convert to srw hubs. Is this true? Thanks again.  

That would really depend on what tire/wheel combo you plan to use if you run a single wheel on it because you may be able to get ones with correct offset and not have to change hubs.  

Thanks for all the help snoman.  

I have heard some conflicting things about spring pearch locations. Some say that they are going to be closer together then the 1/2 ton ones, and some say that there shouldn't be any difference. Anyone know anything about this? I had also heard that the cab and chassis rear axles will have the pearches closer together. Is this true? Thanks.

The difference is with body styles/model years not whether they are 1/2 or 3/4 tons  

from 73' until 91' 1 ton axles have 3" narrower spring pads [ 40"] than 1/2 or3/4 tons [43"], the shock mounts are also different. the brackets on the frame of the 1ton are different to make this possible. so if you try to bolt this in your non 1ton truck you will either need the brackets from the 1ton or weld some new pads on in the right spot.

I would think that this would depend too on whether it is a dualie axle or a SRW axle and axle from stake beds have inner tires set in a bit closer that normal with SRW models. I will have to look into this further for refferance.