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Got today the new shock absorbers from www.tamico.de and installed them immediately. Also I opened the differential and cleaned it and put in new grease.
Original motor with the partial plastic part works fine and I let it run a short time in the living room. Everything is fine and A NEW RESTORED RUNNER IS BORN.
Though there's is some 20 years old mud on the gear box and the chassis, I think it's not necessary to clean since it will be on the road asap.