Rear end knock over bumps??? Help
#1
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Rear end knock over bumps??? Help
Sure someone will know what it is. I don't know and everything looks fine to me. Truck has 119K miles and I am buying new shocks for it this week although I don't think they are the problem.
The knock doesn't happen when empty unless I hit a really big bump or am going over 75 or 80.
Towing the boat it happens a lot of little and big bumps at speed above 50-55 or so.
The more weight and the faster I go the more it knocks.
Any idea what it is? About to take it to the dealership and let them look it over but thought I would check here first.
Thanks
Forgot to say the u joints have been replaced with bigger ones at around 105K miles.
The knock doesn't happen when empty unless I hit a really big bump or am going over 75 or 80.
Towing the boat it happens a lot of little and big bumps at speed above 50-55 or so.
The more weight and the faster I go the more it knocks.
Any idea what it is? About to take it to the dealership and let them look it over but thought I would check here first.
Thanks
Forgot to say the u joints have been replaced with bigger ones at around 105K miles.
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Sure someone will know what it is. I don't know and everything looks fine to me. Truck has 119K miles and I am buying new shocks for it this week although I don't think they are the problem.
The knock doesn't happen when empty unless I hit a really big bump or am going over 75 or 80.
Towing the boat it happens a lot of little and big bumps at speed above 50-55 or so.
The more weight and the faster I go the more it knocks.
Any idea what it is? About to take it to the dealership and let them look it over but thought I would check here first.
Thanks
Forgot to say the u joints have been replaced with bigger ones at around 105K miles.
The knock doesn't happen when empty unless I hit a really big bump or am going over 75 or 80.
Towing the boat it happens a lot of little and big bumps at speed above 50-55 or so.
The more weight and the faster I go the more it knocks.
Any idea what it is? About to take it to the dealership and let them look it over but thought I would check here first.
Thanks
Forgot to say the u joints have been replaced with bigger ones at around 105K miles.
#6
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Do you have the camper package with the extra overload spring pack on top? If so, those will "knock" when they start to contact after about 2" of travel.
Empty, it takes a pretty good bump to hit them. Less of bump with more weight, which sounds like what you're describing.
There's also a rubber sleeve that goes around the arm that contacts them to help reduce noise/wear that may have fallen off. Or it could just be spring fatigue in the main spring pack causing them to contact more than before.
David
(On Edit: Looks like RacerRon beat me on the reply. That's what I get for taking too long to post. At least that's two votes for the same cause.)
Empty, it takes a pretty good bump to hit them. Less of bump with more weight, which sounds like what you're describing.
There's also a rubber sleeve that goes around the arm that contacts them to help reduce noise/wear that may have fallen off. Or it could just be spring fatigue in the main spring pack causing them to contact more than before.
David
(On Edit: Looks like RacerRon beat me on the reply. That's what I get for taking too long to post. At least that's two votes for the same cause.)
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Thanks guys!
Baja hope that is it.
Lurch interesting idea, I can shake it and it is quite lose but it knocks even over the little bumps with the boat behind. Without any load it takes a lot for it to make the noise.
549 Bolts look good to me
Ron, the heavier the load the more it happens. No load it really doesn't happen. Didn't see any contact...
David that makes more sense but wouldn't it show marks/wear? Have a pick of yours? I don't see any contact happening....
Dinner not a way to check them without taking them out? I looked at the bushing I could see and all had rubber around them.
Thanks again everyone
Baja hope that is it.
Lurch interesting idea, I can shake it and it is quite lose but it knocks even over the little bumps with the boat behind. Without any load it takes a lot for it to make the noise.
549 Bolts look good to me
Ron, the heavier the load the more it happens. No load it really doesn't happen. Didn't see any contact...
David that makes more sense but wouldn't it show marks/wear? Have a pick of yours? I don't see any contact happening....
Dinner not a way to check them without taking them out? I looked at the bushing I could see and all had rubber around them.
Thanks again everyone
#9
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Ive got the same exact issue w/ my 98 CC LB. Ive been telling myself to crawl under and have a look while someone is bouncing up and down on the bumper. I hope its either the shocks or maybe the overload springs (camper package w/ overload and rear anti sway). I just want to know what it is so I can either fix or ignore it.HAHA
#10
I had a similar noise on my truck. It was the crossmember at the back of the truck. The rivits holding the crossmember to the frame got loose. I drilled them out and replaced them with bolts. No more noise. You might want to check that.
#11
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Boondock,
If you can grab the Torsion bar behind the axle and move it up and down within the rubber mounts, they are wore out.
The crossmember idea from Sidewinder is also a good thing to check!
If you can grab the Torsion bar behind the axle and move it up and down within the rubber mounts, they are wore out.
The crossmember idea from Sidewinder is also a good thing to check!
#13
DTR's Locomotive Superhero and the DTR Sweet Tea Specialist
I had a knock in the rear of my truck when I would hit bumps. Turned out to be the endlinks and bushings in the rear sway bar were bad. Went to dodge and got the new parts to rebuild it and the knocking went away.
#14
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My truck is the same, I can take my sway bar up and down and get it to click/knock inside the wore out bushings.