Are your slip joints clocked properly, if there out of phase then you have a problem
That's different than getting a vibration after you change u-jointsJayBear88 said:I had a bad vibration in my TD for about 2 years that nobody could find. It only vibrated when driving. We went to replace the rear main and found that the flex-plate was broken. Put a new one in and problem solved.
Same thing here....had ujoints changed (should have done it myself damnit! I think people on this site know a lot more about older dodge drivetrains than any mechanic shop)....huge vibration at 65mph after the new ujoints. AND the ujoints they put in weren't flush anymore like the front ujoints (the new ujoints have already rusted after about 4 months...my old ones still look like steel, so they must have used some cheap ass ujoint.)....2 of the caps are flush and the other 2 stick out about 3/16". Now, they also said that my slip joint was off by about 2 teeth and they corrected it....I looked and the rear ujoints were lined up perfectly. Hell, I'm thinking about turning the rear drive shaft 2 teeth off in either direction to see what happens or try some good quality ujoints and do the work myself.....what's the best brand name of ujoint? for the 79 RC NP203 NP435I'm also having the same problem ddman. I had my u-joints replaced 2 weeks ago and it began to vibrate. I've already taken the truck back twice to the shop and they keep telling me its the ring and pinion. That my whole differential needs to be checked or replaced. My truck vibrates when driving and also when you let off the gas. It starts vibrating really bad around 35 mph. Also, on the driveshaft are the caps to the u-joints supposed to be flush with the driveshaft? Because the u-joint caps in the front is flush with the driveshaft and the rear u-joint caps stick out almost a 1/4 of an inch. To me I figured that was the problem, but they said that that was normal. I have changed the u-joints before and have never had a problem. I don't remember ever seeing the u-joints looking like that with one side sticking a little more out than the other. I have seen a lot of the postings and I'm going to try and check everyone elses responses. Thanks.