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I put Firestone Airbags on our 2003 ford F250 SRW 4WD pulling a late 2006 3400RL to level out the truck a bit. Succeeded at that but have to keep them at about 40 lbs (loaded) to reduce the bobbing that comes on certain roads. Put on new Bilstien shocks to reduce that and they helped but didn't stop it. The only real problem I have now is the back end of the truck is a little higher than what I like at 40lbs or more in the bags. If I had it to do over, I'd try adding another overload spring instead of the air bags to see how they performed. My OEM overload spring on the truck never comes into play anymore with the airbags installed. I don't know if that is unique to the 4WD version or not.
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