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Bump stops for the front

What ever size you need based on lift and tire size! I would suggest you make up your mind on what lift you have,in your 29 posts it varies from 4.5" to 6"+!! :looney:
Definitive Answer: You need a tall enough bumpstop to keep the tires from munching the sheetmetal. The height is based on the amount of cut you've done already, the flexiness of the suspension, along with the wheel/tire combo.

Lift the wheel with a jack, and measure it for yourself. Repeat for the other side.

Jim www.yuccaman.com
Yah, that's pretty much it.
But I'm wondering if he isn't looking for a "rule of thumb" answer.

Something along the lines of:

Measure the distance from the tire to the sheetmetal.(a)
Measure the distance from the bump stop to the bump stop rest.(b)
Measure the distance from the top of the shock body to the upper gromet.(c)

If b>c you will need add a bumpstop equal to the difference or you will bottom your shocks.

If a< than the lesser of b or c, you will need to add bumpstop equal to the difference or you will rub sheetmetal.
Bottom line is to measure your suspension travel. On a stock bumpstop you have to figure that the bumpstop will compress all the way on a big hit on a rut or dip. You want the bump stop to bottom all the way before your shocks bottom. Shocks bottoming is more important than tires rubbing the fenders. If you get too much rubbing you can trim a little more, if the shocks bottom you get an uncomfortable thud and it will eventually damage the shocks or break the mounts.

One way to check everything for sure is to remove the coils and set the front end down on the shocks and bunpstops to see where you are, then adjust accordingly.

Ditto on the Prothane coil inserts, by far the best bump stops for the front of an XJ. If you get them, keep in mind that they will compress quite a bit, mine compress 3+ inches, but it provides a very nice progressive bump stop with no harshness. You buy them long and trim to fit, and they just sit inside the coil. Only modification you need to run them is to replace the stock bump stop with a flat plate for the insert to hit against, you bolt the plate to the tower like the stock bump stop.
just bolt down some damn hockey pucks in there. it works great and very cheap. if you need more then add another puck, if you need less then take one out. simple