Hi. I have a 7520 4WD that's 10 years old and has about 1000 hours. The right front is making a squeaking noise when rolling. It's worse when it's cold, and will sometimes silence after using for 15 minutes or so. But it's getting worse over the last several months. I'm 99% sure it is the U-joint. There are no grease zerks on it, and I've tried spraying it with lubricant but it had no effect. Any advice? Should I drill into it and force some grease inside to extend the life or just let it squeal until it must be replaced? Seems like it's just running dry and a little lube would go a long way. Doesn't look like an easy repair either. Whole right front will need to be disassembled to get to it. Appreciate input, especially from anybody that has had this problem.