red1980F150 Posted September 28, 2021 Share Posted September 28, 2021 Well I looked at the brakes and they look completely fine. I guess U-joints are next to replace. Luckily they are not too expensive. Sometimes you can feel a u-joint at speed too if you can completely unload the driveshaft. I learned about bad u-joints on a couple different vehicles that way, you can feel it vibrate. You would notice it if you are cruising and you let off the gas partially and the vehicle is maintaining speed without drive from the engine (i.e. going downhill) but you're giving it just enough gas to not drag the driveshaft either, thus having no load on it in acceleration or deceleration. Link to comment Share on other sites More sharing options...
Bullnosefan95 Posted September 29, 2021 Author Share Posted September 29, 2021 Sometimes you can feel a u-joint at speed too if you can completely unload the driveshaft. I learned about bad u-joints on a couple different vehicles that way, you can feel it vibrate. You would notice it if you are cruising and you let off the gas partially and the vehicle is maintaining speed without drive from the engine (i.e. going downhill) but you're giving it just enough gas to not drag the driveshaft either, thus having no load on it in acceleration or deceleration. Yeah I’m starting to feel some vibration while driving. Hopefully I can get it fixed soon. The main reason my truck is constantly under maintenance is because I scrap part time and constantly have a trailer hooked up to it because I live in an apartment and have no one close enough to me to park it at. But luckily the u-joints are something I can work on at work because I’ll be getting a bench vise soon enough and I’ll have all the tools I need to replace them. Link to comment Share on other sites More sharing options...
Bullnosefan95 Posted September 30, 2021 Author Share Posted September 30, 2021 Yeah I’m starting to feel some vibration while driving. Hopefully I can get it fixed soon. The main reason my truck is constantly under maintenance is because I scrap part time and constantly have a trailer hooked up to it because I live in an apartment and have no one close enough to me to park it at. But luckily the u-joints are something I can work on at work because I’ll be getting a bench vise soon enough and I’ll have all the tools I need to replace them. Can anyone recommend some good U-joints for a c-6 auto to a full float rear with 4:10 gears? I don’t do a lot of heavy towing but I do haul loads of atleast 2000lbs or more quite frequently. The rear differential has two snap rings and two sides that bolt up and the transmission yoke has 4 snap rings. Link to comment Share on other sites More sharing options...
Gary Lewis Posted October 1, 2021 Share Posted October 1, 2021 Can anyone recommend some good U-joints for a c-6 auto to a full float rear with 4:10 gears? I don’t do a lot of heavy towing but I do haul loads of atleast 2000lbs or more quite frequently. The rear differential has two snap rings and two sides that bolt up and the transmission yoke has 4 snap rings. I like Moog and Dana u-joints. And the Rock Auto catalog is pretty good for figuring out which ones fit. Go here, which should take you to the u-joint selections for your 1986 F250 w/a diesel and see the part numbers and sizes. But you'll have to measure what you have to ensure you get the right ones. Then, armed with the part numbers, you can order from RA or even Amazon. Link to comment Share on other sites More sharing options...
Ford F834 Posted October 3, 2021 Share Posted October 3, 2021 Can anyone recommend some good U-joints for a c-6 auto to a full float rear with 4:10 gears? I don’t do a lot of heavy towing but I do haul loads of atleast 2000lbs or more quite frequently. The rear differential has two snap rings and two sides that bolt up and the transmission yoke has 4 snap rings. Whatever the brand, I always make sure to get greaseable ones. That’s my preference and a lot of them are not (greaseable) these days… Link to comment Share on other sites More sharing options...
Bullnosefan95 Posted October 4, 2021 Author Share Posted October 4, 2021 Whatever the brand, I always make sure to get greaseable ones. That’s my preference and a lot of them are not (greaseable) these days… Would it be possible that fluid is leaking from the rear differential and causing the vibration? My rear differential is covered with grease and oil, and after putting the transmission in neutral I felt no movement from the drive shaft or U-joints. I will still replace them to be on the safe side but could the rear end cause these problems. If so how bad is it to repair it. I’ve never done differentials before. Link to comment Share on other sites More sharing options...
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