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This picture shows a 1949 3/4 ton rear suspension setup.
1spring

This picture shows a 1949 3/4 ton rear suspension setup but according to the VIN this was a type RPO? 2springs

The second picture seems to have 2 springs on each side whereas the first picture seems to only have 1 spring on each side. Take all of this and I'm looking at my 1949 3/4 ton and it looks like the second picture only the springs are on top of each other.

Any info on this. Is the RPO type limited-slip.

That looks like an aftermarket overload setup, the factory option had the springs on top like yours. No it isn't a limited slip. A limited slip rear end refers to a clutch mechanism that is inside the differntial housing. On a Chevy it is generally called Positraction or Posi. GM did not offer it on trucks until '59 on 1/2 tons, 3/4 and 1 tons came later, although you could get them with the No-Spin (Detroit Locker) in the early '60s.

Look at my pics in the gallery on this site. I've got a set of dual springs with one on top of the other. I believe this to be the stock setup.

The No-Spin option in these differentials (aka posi, locker, etc...) was of the Detroit type, in other words it is like two gears meshing together and not two abrasive disks rubbing together.

On the AD models, the overload springs were an RPO on 1 ton and above. That said, I have overload springs on my 53 3/4 ton. When examined closely, these were not factory installed. The stops on the frame were bolted on, not riveted as the RPO overloads were. I suspect mine were a dealer installed option.