Air bags or airlift will give you zero payload increase capacity. They will level out the truck.. I run Airlift 5000 set in my 2007 Duramax.
The ring gear on stock 2500 3/4 ton and 3500 1 ton stock are BOTH 11.5 in size with 3.73 ratio. The only difference in the two is 1 extra leaf spring
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