Quote:
Originally Posted by The Thong
On my way to Volvo600 yesterday I noticed a thrumming (for the want of a better word). It starts about 60mph and goes away once in to the 80mph+ Speeds. There’s more vibration on acceleration and it seems to go away on the over run ie like going down hill. Other than that it thrums away to itself in the back ground. I’ve traveled the internet and not really seen any definitive solutions.
TT
|
Going to assume you have no warning lights or codes.
Any thrum sound to me hints of bearings.. Therefore my first thoughts are wheel bearings, but the sound disappears on over run, which hints at transmission, as the wheels will still rotate the same whether or not on the over-run but the transmission would be loaded differently, on power and during over run .... so thats my opinion. From there its gearbox issues and in the case of AWD... bevel gear....???? Other parts of the AWD system propshaft, haldex; rear diff are reasonably sound, although I have read cases of prop bearings becoming noisey.
just my 2d.
Cheers
Bob