Join Date: Mar 2000
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Re: YJ Modification Questions
I run an SOA and 35" tires on my 89 YJ.
Front set up is SOA, with 1 1/2" National Spring 5 leaf spring pack, custom made shackle reverse with 2" of lift and 2" of forward relocation of front axle incorporated into the design, modified front shock towers to handle the 33" R5000s.
Rear set up is SOA,(over Ford 8.8 axle) with 2 1/2" Pro comp leafs, and 1 1/4" extended shackles, modified shock mounts to a 45 deg angle using a custom made cross member as the upper attachment point,33" R 9000s with in cab adjustment.
The system nets about 7" of lift with outstanding flex and articulation. It works very well in steep terrain at keeping the rear tires to the ground. Front and rear droop and compression are both about equal with maybe a small edge to the front, both net aprox 9" of drop and 5" of compresion from their neutral posture. Well over 1200 RTI on 20 deg ramps, and 1000 on 30 deg., it ramps best when the rear springs are on their last leg, but does not perform nearly as well on steep rocks, at that stage, due to the rear springs inability to prevent axle wrap, and subsequent wheel hop.
On road handeling is fine with very little wandering at speed, very moderate nose dive under hard braking.
The drawback to this system is that the rear leaf packs take a beating, and rarely last more than a few months. Ive attached a picture showing the elevation acheived above the 35" tires while on a fairly flat surface.
If at first you dont succeed, your replacement will try and try again.