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Most will attach under the u-bolt plate. They will limit the amount of flex you have but they help a lot with spring wrap. If you need a lot of flex don't bother with them. If you run a lot of sand or mud and you notice anytime you get on the gas and your rear end starts jumping you may want to give them a try.
With some fabrication skills they shouldn't be too hard to make, as long as you keep it simple. An inbetween approach would be to buy the bars that mount with shocks on the front of them, these allow a little more flex, but if you need these I doubt flex is of much concern.
airmanskee has/had them in his build thread.
I don't do trail riding. Truck sees mud during hunting season. Every time I am stopped and go to move there is a thunk. Started after the block. I only have a 2" block in it. U joints all been replaced. Rear end has been checked for play. Everything is fine. All I can think of is axle wrap. Flexing is not an issue. I am not a rock crawler or anything of that nature.
Agree.
And last I saw a pic of skee's truck they were not on.
A "thunk" isn't axle wrap.