10thta Posted October 7, 2021 Share Posted October 7, 2021 My truck has developed a slight vibration during highway driving above 65mph. Not death wobble, and not too bad but noticable enough. If I put it in neutral at speed, then back into drive, it instantly goes away for a while, and only occasionally returns. Ive replaced motor mounts, trans mount, new tires, all suspension components (ball joints, bushings, tie rods, shocks, etc) as well as the idler pulley, serpentine belt, new u joints in driveshaft, new front wheel bearings, and most recently new power steering pump and its still there. Rotated tires and its still there. It feels similar to what a "roaring" wheel bearing feels like when its going bad, but it ONLY happens at hwy speeds over 65. Since this is 2wd its the old school front wheel bearings, not the entire hub assembly like on a 4x4. I am stumped. Anyone have ideas? thx Link to comment Share on other sites More sharing options...
Pete M Posted October 8, 2021 Share Posted October 8, 2021 what shape is the rubber isolator inside the shaft in? rear axle bearings? Link to comment Share on other sites More sharing options...
ghetdjc320 Posted October 8, 2021 Share Posted October 8, 2021 Is the truck lifted? Stock driveshaft? My suspect would be driveshaft/u joints but would need to know the angles of everything to see where the problem may be. If your running a stock driveshaft, the pinion yoke and transfer case output must be parallel. Any chance that has been altered at some point? Link to comment Share on other sites More sharing options...
10thta Posted October 8, 2021 Author Share Posted October 8, 2021 Truck is stock height. Never altered in any way. Everything is stock. 2WD so no transfer case to deal with. I guess i never considered anything in rear axle because vibration feel more front to center located. What rubber isolator should I be looking at? What's it called exactly? When I changed the u joints everything looked good in the tailshaft and the rear diff. And i did remember to mark the driveshaft so it went in the same position it came out. Thanks for the replies guys. Link to comment Share on other sites More sharing options...
Pete M Posted October 8, 2021 Share Posted October 8, 2021 2wds have a 2-piece driveshaft. at the back of the shaft you'll find that the outer sleeve (connected to the front ujoint) goes over an inner sleeve (that's attached to the rear ujoint) and between them is a rubber isolator. Link to comment Share on other sites More sharing options...
10thta Posted October 8, 2021 Author Share Posted October 8, 2021 awesome Pete! I would guess I need to drop the D/S to inspect this? Link to comment Share on other sites More sharing options...
Pete M Posted October 8, 2021 Share Posted October 8, 2021 you can try shaking it vigorously. it shouldn't move at all Link to comment Share on other sites More sharing options...
Eagle Posted October 8, 2021 Share Posted October 8, 2021 When you replaced the u-joints in the driveshaft, did you mark the shaft to replace it in the same orientation it was originally? If not, drop the driveshaft, rotate it 180 degrees, then reinstall it. Link to comment Share on other sites More sharing options...
10thta Posted October 9, 2021 Author Share Posted October 9, 2021 yes. I marked the D/S so it could be reinstalled same way. Link to comment Share on other sites More sharing options...
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