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AR15.COM
5/14/2011 7:26:35 PM EDT
Any disadvantages to an add a leaf kit for the rear suspension? I know it'll make the ride a little stiffer/rougher, but anything else? I have an '06 f150 4x2 with stock suspension. The shop tells me I will gain 800-1,000 pound increase in load capacity, will help level loads, and will raise the rear end about 2" when empty. Sounds like what I need. Any reason not to do it?
5/14/2011 7:49:04 PM EDT
[#1]
Those were real sensitive about driveline angles. You may need to shim the center bearing down a little after you increase the ride height.
5/14/2011 7:59:24 PM EDT
[#2]
Thought about that, too. The shop, which is a specialty spring and suspension shop, says that it shouldn't be an issue as we won't be raising the rear end too much. For my own validation, the angle would cause increased wear on the u joints, right? How would I know that there was a problem other than I start breaking u joints?
5/14/2011 8:17:38 PM EDT
[#3]
I went the other way with my F150, lowering the rear by 2".  It had a horrible driveline vibration when accelerating from a stop.  I adjusted the rear shackles to the 1-1/2" position, and it's been perfect ever since, so yeah, very picky about driveline angles.

Try it and see, if you've got any bad vibes, you need to adjust your pinion angle or return back to the stock ride height.
5/14/2011 8:23:11 PM EDT
[#4]
ok, so I'd look (feel) for vibrations to tell me that something is amiss. Thanks!
5/14/2011 10:01:03 PM EDT
[#5]
One thing to keep in mind is that while you are increasing the load capacity of the springs, you are not increasing the load capacity of the axle.
5/15/2011 6:41:05 AM EDT
[#6]
Just get air bags added.

I don't even use the compessor thingy.    I just put a couple shraeder valves somewhere, and I air up at the gas station.