Will shackle flip affect towing capacity?

[Dieselwrencher]

Originally Posted by special-K

I'm sure those who run shackle flips will say no problem.Personally,that's what I don't like about them. They are great for a trail rig,but for a truck that works I would never use them. I feel that by design they are just not good for a lot of stress from weight. Why do you think trucks are built the way they are? The leverage is multiplied many times and I'm just not putting that much faith in not only the long bracket arm extending below the frame,but then the shackle itself off of that. Where you want articulation you're not going 70 mph with a thousand or more pounds in the bed and cornering...let alone a loaded trailer. To me shackle flips are only for play toys.

If this were true, medium duty trucks leaf spring suspensions would be designed this way. But they're not. They're set up with the shackle under a mount, then the leaf spring. Just like a shackle flip. I haul with a shackle flip on my F-350 all the time and I'm going to bet it's more weight than 90% of the people on this truck board haul. On and off road, and these have been on there for 60,000 miles. 40,000 of those have had a heavy load on the truck or in it. We're talking a hay trailer with 6-8 round bales and a trailer that weighs 5500lbs empty. And this truck is lifted roughly 4" and has 33's. It weighs 7400lbs with a 1/4 tank of fuel and no fat guy in it. I also have sway bars front and rear, so she handles pretty well with a trailer on. I wouldn't be worried with a shackle flip and a small lift to tow.