No issues with the axle tubes coming out of shape from welding?
CK5
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Vibration on deceleration at highway speeds
- Thread starter Coontail
- Start date
Definitely good to know and I'd love to a shackle flip but it's out of budget at the moment
I didn't, but they were some pretty thick wall tubes. Some people do pre-heat, use bars ect.
Shackle flip is a budget fix, some guys pulling it off for close to 0$. Why take it apart and maybe scrap the U-bolts to do things halfway? If you just want the cheapest hack to improve things slightly for short-term, put that in the initial post so nobody wastes time thinking it through for you.
Welding to the axle tubes isn't a big problem. Generally you want to drain the oil first, grind and pre-treat before welding, but if new oil, a gasket, some cut-off wheels and some weld wire is out of your budget, maybe park the thing for a while while you save.
78 GMC Jimmy
1/2 ton status
Does the vibration go away if you shift to neutral while decelerating?
Neutral makes no difference, the only thing that makes it stop is slowing down
78 GMC Jimmy
1/2 ton status
One option is to put all 4 corners up on jack stands and then put the rig in 4x4. Have someone put in in gear and get all the wheels spinning. You might be able to see whats shaking by looking under the truck. Then try 2x4 mode and see if the problem goes away.
rampage
3/4 ton status
78 GMC Jimmy
1/2 ton status
You want to put the front bumper up against a building or something, and stay away from the tires/drive shafts. Also, if your doing this on a newer vehicle, make sure the driver window is down, since some cars auto-lock the doors when the vehicle get up to a certain speed. Switching between 2 and 4 wheel drive will isolate where the vibration is coming from. Plus you can sometimes see parts wobbling under the rig. If the vibration does not go away when shifting to neutral, then its probably not related to the engine/transmission.And make sure you have someone recording this.
while this method running on jack stands will show issue in some circumstance, it wont help for this as the rear axle will not twist the springs if unloaded
I've thought about doing this and while I appreciate the idea, I don't like to live that dangerously lol
78 GMC Jimmy
1/2 ton status
I have don't it before. I used it to track down a noise that turned out to be hub bearing. I mean if you want to make it super safe, you could put jack stands under all 4 corners and then remove all the wheels. With no wheels, its not as dangerous.
Pinion angle was definitely the issue
I installed some 5 degree steel shims and the issue is just about gone. The angle is still a little low and I don't see them as a permanent fix so a shackle flip is definitely in the future. Very excited I can kind of enjoy the truck finally!
Thank you all for taking the time to help
I installed some 5 degree steel shims and the issue is just about gone. The angle is still a little low and I don't see them as a permanent fix so a shackle flip is definitely in the future. Very excited I can kind of enjoy the truck finally!
Thank you all for taking the time to help
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the sale at Discount/America's tire ?
