OP: It sounds like your SLS control valve is leaking off the base pressure, or maybe cannot even hold base pressure. The combination of base pressure with spring force is what keeps the rear suspension level with no load.
Simple check of SLS / rear suspension bushing health: Measure between following two points: (1) center of star in cap in center of rim of rear wheel, and (2) belt-trim that runs entire length of car. Should be 18 inches when car is unloaded and "ready to drive" (i.e. full tank of fuel, all fluids full, spare tire and tool pouch in place). If more or less, then something is different or wrong.
Leak-by test: Run the engine until the rear suspension is "pumped up", and then shut off the engine, open up the SLS reservoir and watch the return line exit into the tank. If it keeps drip drip dripping for five or ten minutes and the rate does not decrease, then you know your control valve is leaking off the base pressure. Rebuild or replace. I've had terrible luck rebuilding them, gave up after two attempts using the MB kit.
Quote:
Originally Posted by vstech
Hmm. I'd ... adjust the level valve.
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How? The FSM calls for some special tools.