Hello everyone.
My Discovery 2 has a grumble coming from the drivetrain under deceleration from around 55-70MPH. It goes away at about 55MPH. The "feel" of the grumble can also be created by applying very light pressure to the gas between 35-55. Researching this is challenging, though I can say what it is not:
When coasting uphill the sound does not occur; when downhill it is worse. Seems to start from the front but gravitate to the back. Seems to take on a different rhythm when heavily loaded (trailer, stuff inside). The Disco has:
Pinion shaft nut torque was suggested as it may "come loose with lifted trucks" - but in advance of checking I'm looking for those things that can be checked at home, I'm a competent garage mechanic but don't have a lift at home. I'd like to at least educate myself and eliminate the known issues before giving up and having the local guys seek out the issue.
Here is the laundry list of what I've researched:
Thank you in advance
Brad
My Discovery 2 has a grumble coming from the drivetrain under deceleration from around 55-70MPH. It goes away at about 55MPH. The "feel" of the grumble can also be created by applying very light pressure to the gas between 35-55. Researching this is challenging, though I can say what it is not:
- the front driveshaft as it is brand new and regardless the truck grumbled with it and the predecessor shaft
- the fluid in the diffs or transfer case as it was replaced
When coasting uphill the sound does not occur; when downhill it is worse. Seems to start from the front but gravitate to the back. Seems to take on a different rhythm when heavily loaded (trailer, stuff inside). The Disco has:
- OME 1.5" HD lift (new)
- TW front shaft
- Stock rear shaft, new rotoflex
Pinion shaft nut torque was suggested as it may "come loose with lifted trucks" - but in advance of checking I'm looking for those things that can be checked at home, I'm a competent garage mechanic but don't have a lift at home. I'd like to at least educate myself and eliminate the known issues before giving up and having the local guys seek out the issue.
Here is the laundry list of what I've researched:
- Bearings...I've checked for looseness and can feel none, though I
- Pinion nut as noted above
- Rotoflex...seems to be a debate on whether or not it should be used in lifted applications
- Differential spider gear
- Transfer case bearing(s)
Thank you in advance
Brad