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Why are you having to replace the muffler every year? Is it because of rust? If so, get a stainless exhaust system, or a aluminized one. Both are not cheap, but will last a long time.
The u-joint issue is most likely the result of an improperly installed 4" suspension lift. When you lift the YJ's that much, you should install the slip yoke eliminator kit and a CV rear driveshaft. What is happening now is that the ujoints are binding as the suspension cycles. The ujoint angles are too great for ujoints to handle.
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