x5sd e70 Driveline vbration around 20 mph

[Leslie]

Have just had the prop centre bearing changed due to a banging at low speed and its was toast but I still have a drive line vibration that I can now feel that seems worst at 20 mph then disappears or is greatly reduced by 30 ish mph . Its a bit annoying or even worrying what is going to break next Its also had a transfer box brace that holds it in due to rot and a new bush in the casing recently .

I'm trying to thing what it could be , I would hope the mechanic checked the guibo but it is maybe on the way out now too , I will ask him when I next see him. All tyres the same and good and its at quite low speed much lower then wheel imbalance , had a rear diff a couple of years ago and it just whinned depending on roadspeed not vibrated .

Old x5 Ownership becoming a pain! wonder if anybody had a similar issue ?

[X5Sport]

One question. Did the mechanic reconnect the two parts of the driveshaft in exactly the same position as they were? The shaft is balanced as a single assembly with the centre bearing. It has to be split to remove the centre bearing and both halves must be rejoined in exactly the same orientation. If they weren’t then the balance will be off.

[Leslie]

Yea he always makes sure to do that as he had said it to me before , i'm guessing the rumble was there already but masked by the centre bearing knocking quite a bit at the same sort of low speed It does seem to be a prop type problem though the more I think about it so will need inspecting more closely