We purchased a used 2011 3150RL this year and have went through most of the suspension getting ready for our first trip next week. Replaced the shear springs (mine were 16K), added 3 x-factor axle braces, heavy duty wet-bolt kit, repacked the wheel bearings and upgraded to new sailun tires. My shear springs were about the same as yours and leaf springs are in good shape. I Was considering several other suspension upgrades but decided to give the original suspension a shot as this is our first 5'er and I've dumped a bundle into it already. hoping for the best, joe.
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