Hi,
If you support the car in the rear by placing the jackstands under the
trailing arm crossmembers, the weight is distrubuted as it would be
with the car sitting with all four wheels on the ground with one
exception: the point where the spring mounts to the upper x-member.
Of important note here is that by using the trailing arm x-member, the
only force on the frame that is different than "normal" is the hanging
unsprung weight of the road wheel, trailing arm and related "stuff".
Yes the frame will flex, but it flexes when you're driving. Will it do
irreversible damage? I'll say this: if it does irreversible damage, the
frame is screwed up anyway and all you are doing is forcing it to fail.
The real question is - why are you supporting the car? If this is for
storage purposes, then you don't need to do it. If it's to work on the
car, that's different. If you intend to do a lot of work on the car over a
long time, then you should support the frame in more than four locations.
For example at the frame in front close to the axle centerline, the
trailing arm crossmembers and some point along the up-turned rear legs of
the frame.
regards,
rml
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