I can tell you this right now... DO. NOT. PURCHASE. DORMAN. LCAS.
I went through this whole debate in my head early last year, and in doing my research I got some positive recommendations for Dorman aftermarket LCA's. One of those recommendations was from a member on here ( [MENTION=45449]coinball[/MENTION] ) and another was from a trusted mechanic, who told me that they had seen good results when replacing worn factory LCA's/bushings on several Tundras with Dorman arms.
I looked into them and they were available on RockAuto for about $70 a side. That made them cheaper than replacing just the bushings with Toyota parts, and much cheaper than buying new Toyota arms.
Fast forward a year, and about 10K miles... The handling on my '97 4Runner is now a little scary. It darts around when it hits bumps and ridges on the pavement. Under heavy braking the steering wheel will pull one way or the other. In straight line situations it wanders excessively. And the real kicker? The almost NEW set of Yokohama Geolandars that I had on the rig when I installed the Dorman arms are now horribly worn in the inside edge. They are feathered badly and the inner most tread block is worn down twice as much as the rest of the tire. I've rotated them in the meantime, so all 4 tires now have this kind of wear. After I noticed it I stopped rotating and just let the front tires take the brunt of the damage, and at this point they are throwaways.
Keep in mind, my last set of these tires went 65K. The Dorman arms wrecked these ones in less than 10K.
The problem with the Dorman arms is that the rubber in the bushing is excessively soft, so the LCA's deflect when the vehicle is in forward motion and the alignment ends up toed out. In turns, the outside front wheel goes positive camber and the inside wheel goes negative. I noticed the softness of the rubber when I inspected the arms, but having no point of reference other than the old, torn, and crusty stock bushings I wasn't sure if it was normal or not.
When I park at a gas pump, especially if I have turned the wheel while pulling up to the pump. The front tires will be way off camber once I straighten the wheels out. Once the rig rolls forward a few feet, they go back into spec. That as all due to deflection in the LCA bushings. I've had it aligned TWICE by the very best alignment tech in ABQ, and each time it shows up IN SPEC.
So now I'm deciding between poly bushings and new Toyota arms. I'm leaning toward new OEM arms just to avoid the hassle of doing this a 3rd time, and paying another $60 for an alignment.
If I were to do it over again, I'd just buy new Toyota LCA's from the get go. You can bet that's what I'll be doing when it's time for new ones on the '01.
PS... Prior to replacing the LCA's, I had installed new Toyota LBJ's, ITRE's, OTRE's, steering rack guide, rack bushings, and had an alignment done. The whole front end was new, so I can 100% attribute the problem to the LCA's.
Also, Coinball has since experienced the same problems, as he confirmed to me via PM. He ditched his Dormans and listed them cheap in the classifieds on here.