I highly recommend building your own, its a fun intensive project! Take a welding class at your school or local college and ask to do this as a side project! Cost is much cheaper as well. I built 2 sets, one for a 97 one for a 94. I believe it was right around $440 for 1 set (paint not included). It could of been cheaper but I gave the guy bending the kickout pipes extra (he knocked them out in 2 hours same day!). Then I had to buy 20 ft sticks so ended up with 40 ft of metal when I only around needed 24 ft to do both.
breakdown:
$450 for all the metal 2 - 2x3x3/16, 2 - 1-3/4 DOM w/.120 wall, 1 - 2x2x3/16, 1 1/4"x3", 1 3/8"x3", 1 1/8"x3" (extra just in case)
$200 to bend the 4 kickouts (outsourced to a local company)
$160 welding consumables (about 10 lbs of wire, 1 tank of size 4 mix, few cuttoffs, grinding wheels)
$70 for the 3/8" u-bolts (mcmaster sourced, grade 2 which is why they are doubled up)
Labor cost freeeeeeeeeeeeeeeeee lol, i didn't have anything better to do anyways.
The advantage of building your own is they can be customized. I used WKOR sliders as reference for design. I wanted the slider to stick out further and have a larger kickout than the WKOR sliders had. The front is a 4" radius bend and the kickout is a 6" radius bend. I also customized the angle and placement of them. Then the total length is longer than most purchasable ones as well. I believe the total length is 71-3/4". This still leaves about 1" of unprotected rocker between the slider on each side before the wheel well. By far the hardest part is getting the compound cuts right for the frame to slider support. I recommend using 1.5x1.5 wood pieces to trial fit your cuts before cutting the metal 2x2s.
I can jack the vehicle up with on them and they don't flex at all. Even with the jack on the end away from the frame supports. I kind of wished I went with 1/8" instead of 3/16" because man they are beefy!
Instead of U-bolts you could create a U out of metal and use a bolt at the top. I am okay with the u-bolts though. Even though the u bolts are 3/8" compared to some other slider manufacturers larger diameter ones, the proof load of each bolt and tensile strength is very good. 4250 lbs proof load and 5750 min lb tensile strength. They are also super easy to source. I had a difficult time trying to source reasonably priced ones Mcmaster car rates them at 1075 lb capacity. This is because the application is for hanging stuff architecturally so there is likely a built in safety factor!
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