Originally Posted by gsellars
I think I'll gain some flex with the MCs goin from fixed lowers without JJ and stock uppers. I have seen jeeps with my lift flex way more than mine by adding the MCs and trimming flares or switching to MCs arched tube fenders....
OK, let's break things down.
What is "flex"? It's travel, articulation, whatever you want to call it. Your axle cannot go higher than the bump stops allow and it can't go lower than your shocks allow. In many cases, the LCA's against the back of the coil buckets/shock bracket will prevent any further downward travel.
When it comes to articulation, standard Clevite bushings and other non-flexible ends don't do very well. But if you put your Jeep in a situation in which the axle is being forced up on one end with the full weight of the Jeep acting on it, those bushings aren't gonna limit you. They'll be pushed past their operating limit, sure. But they aren't going to be able to interfere with the forces at hand.
Those arms will end your days of wearing out bushings or damaging mounts. But unless you switch to a longer spring and longer shocks, you won't be gaining any travel. This is a widely misunderstood concept across the entire modified Jeep scene.
If you want to gain travel, you need to determine full bump, run the longest coil you can, pick shocks that agree with the coil length, and set up the shock mounts to optimize the travel. And if you're sticking with stock CA mounts, there's no point in trying to push past 12" of travel. Not gonna work.