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hilltop4527
hilltop4527, Auto Service Technician
Category: GMC
Satisfied Customers: 91
Experience:  Independent repair shop owner/operator experience with many makes and models both foreign and domestic.
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2003 gmc 3500 savana with severe rear end vibration when

Customer Question

2003 gmc 3500 savana with severe rear end vibration when braking. What are the possible causes other than drive shaft u joint? How do I check to see if the u joint is bad?
Submitted: 7 months ago.
Category: GMC
Expert:  david craig replied 7 months ago.

Hi Im David, thanks for visiting the site. can you feel the vibration in the brake pedal?

Customer: replied 7 months ago.
No
Customer: replied 7 months ago.
At least I don't recall. It's not a van I drive often at this time of year
Customer: replied 7 months ago.
I'll double check and get back with you in 15 minutes
Expert:  david craig replied 7 months ago.

ok

Customer: replied 7 months ago.
Apologies . My driver gave me the wrong van. It's my 2013. Which is ok because I did an oil change and tire rotation yesterday and now the problem is in the front. Brake pedal is fine. I'll have the tires balance checked and get back to you if that doesn't clear it up
Expert:  david craig replied 7 months ago.

ok.

Customer: replied 7 months ago.
As it turns out I didn't rotate the tires on that van. So all things being equal, the vibration went from rear to front with no vibration or pulsing of the brake pedal. I'll check with the driver this afternoon and get his input and get back with you tomorrow after the new tires are put on.
Expert:  david craig replied 7 months ago.

ok. i appreciate the update.

Customer: replied 7 months ago.
I had new tires put on today and I'm still getting violent shaking coming from the front end when braking coming from highway speeds such as exiting the highway. I am having it aligned tomorrow. What's odd is that when I drove the van Saturday the vibration was definitely coming from the rear. Now it's in the front. Brake pedal is unaffected. The van has 42K on it. There are not any mechanical noises either.
Expert:  david craig replied 7 months ago.

do you feel it through the steering column?

Customer: replied 7 months ago.
Minimal
Customer: replied 7 months ago.
Minimal. Should I wait to proceed until after the alignment?
Expert:  david craig replied 7 months ago.

i definitely would.

Customer: replied 7 months ago.
Ok. Touch base with u tomorrow
Expert:  david craig replied 7 months ago.

if something is extremely bad i.e. bearing, tie rod or balljoint they wont even do the alignment, but at least they can tell you whats up

Expert:  david craig replied 7 months ago.

checking in to see how its going

Customer: replied 7 months ago.
They did the alignment.
I didn't pick up the van so I wasn't able to test drive. I'll rate you now so you can get paid, but, will let you know tomorrow am how the test drive goes
Expert:  david craig replied 7 months ago.

ok. please let me know. thanks

Customer: replied 7 months ago.
The vibration is gone in the front but the van still shakes in the rear when braking at higher speeds. Such as speeds 50 and above.
Expert:  david craig replied 7 months ago.

did you have the rear tires rebalanced?

Customer: replied 7 months ago.
Brand new tires Michelin
Expert:  david craig replied 7 months ago.

im out of ideas my friend. i will opt out and maybe another tech will have a different opinion. sorry. good luck.

Customer: replied 7 months ago.
Ok. Thanks for you patience
Expert:  hilltop4527 replied 7 months ago.

hi there I see you are having some trouble. I will try to help. unless I'm missing something it appears like everyone is missing the most likely cause of shaking while braking. which is warped brake rotors. Have these ever been replaced?

Customer: replied 7 months ago.
No . If the rotors are warped would that cause the rear end vibration?
Customer: replied 7 months ago.
That's why my first thought was the u joint
Customer: replied 7 months ago.
How do I check that?
Customer: replied 7 months ago.
I can check the rotors and drums and shoes, but, it wouldn't be until Saturday