"Tim, That is why I asked if anyone had any supporting documentation concerning the hazzards of S/R kits on highways? If someone does, I would be just as intrested in reading it as the report written about Samurais being 'tippy'. I find it very confusing how two manufactures have two complete different opinions concerning SPOA and S/R..."
Tim Martin m -clipped from another thread-
I don't think you'll find professionally researched information of this nature available. What you'll find is a plethora of personal observations, and that every manufacturer of SWB 4x4's puts the shackles in front. If a vehicle rode better and did not compromise safety, all shackles on all SWB vehicles from all the factorys would be in back.
We ran a S/R for about 2 weeks before I was instructed to remove it from the vehicle. Our observations (oldtimers may remember this from a few years back):
The axle is under rotational forces when braking hard. The axle pulls down on the front and pushes up on the rear of the front suspension. With the shackle up front, the suspension will pull itself downward on the shackle. Nothing happens. The shackle hangs freely anyway and can handle this 'pulling'. The rear of the spring is fixed solid in the spring hanger. In this configuration (the factory setup) the suspension should stay put and track straight under hard braking.
When a shackle is moved to the rear, what happens is that the rotation of the axle is now pushing up on that shackle that is now in back. The softer the spring, the more noticeable this is. This is one reason why you'll see stiffer springs sometimes sold in conjuction with s/r systems. So, instead of a nice controlled downward pull of the shackle, it is now being shoved upward. This causes unwanted flex in the springs which further pushes that shackle backward and allows the axle to rotate more freely. This is known as 'brake dive'. In the worst instances, it can make your front axle hop. An axle hopping is very dangerous under emergency braking.
Even off road this can happen. We watched a s/r equipped CJ5 go flying down the last 20 feet of Lionsback in Moab as his front axle was hopping. He was actually not braking, it was under engine compression (other cicumstances were involved, but the net result was ugly). The owner was in our 4x4 club and went back to shackles up front after that trip.
In our case, my fiance' told me she felt the vehicle was spooky to drive on the highway and I was told to remove the system.
As a result, we only recommend our shackle reverse kits as an offroad system only. We don't feel its safe enough to advertise as a good highway system. We do the same for our Missing Link system too. Some of our customers understand this, accept the risk, and drive on the highway with these products. But at least they know there is a risk. We don't just trump up benefits and hide the drawbacks.
I hope this clears up our viewpoint on why our company's position is that we recommend S/R systems for offroad use only.
As for Yankee Tim and myself... he's going to buy me a couple beers in Moab and we're going to duke this thing out to see who's really right :^)