ddrakenfd22
TYF Newbie
- Joined
- Mar 18, 2025
- Posts
- 1
- Reaction score
- 1
I have a 2011 GMC Yukon Denali that makes a thump upon take-off, the driverside motor mount has already been replaced. Does anyone have any advice for what may be happening.
2011 GMC Yukon Denali makes a thump noise upon take-off
- Thread starter ddrakenfd22
- Start date
Disclaimer: Links on this page pointing to Amazon, eBay and other sites may include affiliate code. If you click them and make a purchase, we may earn a small commission.
if not still a motor mount, then front diff mounts they disintegrate over time
petethepug
Michael
Welcome from SoCal.
What’s your milage and do you happen to know if the previously replaced motor mount was OEM and / or the fluid filled version for the Denali & Escalade?
Replacement of just one motor mount taxes the burden on the other used mount similar to why shocks are always replaced in pairs. The other mount may have failed.
The clunk can be sway bar bushings, front diff (dog bone) mount bushings, a front strut mount bushing or even a upper / lower control arm / tie rod end or rack bushing.
You’ll need a shop to pry & poke all of them to find the culprit. At 100k all of those should be replaced regardless.
What’s your milage and do you happen to know if the previously replaced motor mount was OEM and / or the fluid filled version for the Denali & Escalade?
Replacement of just one motor mount taxes the burden on the other used mount similar to why shocks are always replaced in pairs. The other mount may have failed.
The clunk can be sway bar bushings, front diff (dog bone) mount bushings, a front strut mount bushing or even a upper / lower control arm / tie rod end or rack bushing.
You’ll need a shop to pry & poke all of them to find the culprit. At 100k all of those should be replaced regardless.
swathdiver
Full Access Member
Check the new mount, check the brackets that the front differential bolts too and also inspect your universal joints and the yoke going into the back of the transmission/transfer case.
Joseph Garcia
Supporting Member
- Joined
- Aug 2, 2018
- Posts
- 7,932
- Reaction score
- 10,962
I say that you have a 90% change that it is the front differential mounts. Been there, done that. Purchase the 2 mount arms with bushings already installed to make the job easier.
A lesser chance it is the slip yoke on the front end of the rear driveshaft coming out of the transmission assembly. Replace it with a nickel plated slip yoke.
A lesser chance it is the slip yoke on the front end of the rear driveshaft coming out of the transmission assembly. Replace it with a nickel plated slip yoke.
Is it just on take off? Do you have any other symptoms? Our old Suburban had totally shot U-Joints (couldn't tell until they were removed) that caused a clunk every time you put it in foward or reverse. It also caused noise and dash vibrations at 50-60 MPH. Not above or below that though, oddly.
