gmc sierra rear leaf to coil springs?

[yates ™]

So start looking up the parts to install a custom one or buy a Dodge as they already come linked with coils in the rear.

 

[stoltz23]

I'd get on ebay and find a nnbs silverado/sierra reg cab 4.3 (should be the lightest spring rating) and get the last 8 of the vin. Then call the dealership and give them the vin of his 6.0 and the 4.3 and see if they can tell you the part numbers for each spring and the load ratings. Unless you have a friendly dealer that will look up parts with out the last 8 of the vin. Most will not give you the time of day unless you have the last 8 of the vin.