The 1947 - Present Chevrolet & GMC Truck Message Board Network - View Single Post - 70 C30 dually combined towing capacity GCWR?

Richard2112 · 03-19-2018, 10:17 AM

I am sort of interested in this also as I too have a 70 C30. But regardless of it's rating, (I have been told that the rear tire load rating is key), I consider axle wrap to be a primary consideration, leaf spring capacity, axle cap, shock absorbed "down travel" and brake capacity/function to be relevant considerations. An anti-sway or anti-roll bar would also be a consideration as mine didn't come with one.

I am running HD shocks, a traction kit, leaf over-load springs and a 14 bolt w/3.73's, 32 inch tires (I think load cap is 2600 each), 3.50 brake rear shoes in 13 inch drums and front discs. Recently rebuilt/installed an NV4500 (added mechanical speedo gears from sm465). Have yet to add anti-sway bar and am considering additional set of air shocks to adjust height.

My concerns are what size trailer I can control. Wet or dry pavement.

03-19-2018, 10:17 AM	#2
Richard2112 Registered User Join Date: Jul 2014 Location: South East Ohio Posts: 644	Re: 70 C30 dually combined towing capacity GCWR? I am sort of interested in this also as I too have a 70 C30. But regardless of it's rating, (I have been told that the rear tire load rating is key), I consider axle wrap to be a primary consideration, leaf spring capacity, axle cap, shock absorbed "down travel" and brake capacity/function to be relevant considerations. An anti-sway or anti-roll bar would also be a consideration as mine didn't come with one. I am running HD shocks, a traction kit, leaf over-load springs and a 14 bolt w/3.73's, 32 inch tires (I think load cap is 2600 each), 3.50 brake rear shoes in 13 inch drums and front discs. Recently rebuilt/installed an NV4500 (added mechanical speedo gears from sm465). Have yet to add anti-sway bar and am considering additional set of air shocks to adjust height. My concerns are what size trailer I can control. Wet or dry pavement.