Quote:
daToy previously said:
I did some flex testing. You will have to excuse my garage tools. I hope this help shed a little light on the issue. I looked at the front body mount for compression and also setup a gauge mounted on one side of the body and used it to measure any deflection on the other side. Note that this test was done in a static environment. If you add dynamic forces the frame will most likely flex even more.
The test showed no flex in the body but 1/4" compression of the right bushing. this was with the FJ lifted 17" on the left front. I did not get the left rear tire off the ground which was my original intention but it was just to height to go with the high lift.
With additional lift of the left front to the point the where all weight is removed from the left rear may show additional bushing compression (there is not much left) and then start transferring the flex to the body.
For the second test I loosened the bottom bushing on the right side to see if that would allow any more movement in the top. No additional space was noted.
Summary:
This test shows torsion flex in the frame under static load. I did not even get maximum lift on the left hand side. With the rear tire totally unloaded and dynamic forces added there will be additional flex in the frame. The bushings will reach maximum compression and the forces will then be applied to the body.
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Strong work!
This shows measurable flex of the frame, but I disagree that you showed that the body WASN'T twisting, because you measured it relative to itself. Only if the grill was allowed to shear like a parallelogram would you have been able to detect twist, using that reference line.
The existence of frame flex under static load conditions is a key point to understanding where the forces are coming from that are bending the body.
Rep points!
I really appreciate that you took the time to do this, and did such a good job documenting your work!
