Smurf510 Posted March 22, 2023 Report Share Posted March 22, 2023 So a new noise started today in my 510. It only happens when I'm driving over about 20 mph. I can put the car in neutral and rev to 3-4K and no noise at all? It sounds like it is coming from the tranny area. Any suggestions on what it could be? Quote Link to comment
datzenmike Posted March 22, 2023 Report Share Posted March 22, 2023 If it's in the transmission there's nothing you can do to fix till it's removed so lets concentration on things you can look at and perhaps fix. 'knocking sounds'... Check that the engine to transmission bolts are all tight Check that the transmission mounting bolts to cross member are tight (while under and at the transmission check the oil level. With the bung removed on the side, you should be able to insert small finger and touch the oil) If you don't know when it was changed last change it now, GL-4 90w NOT GL-5. Must be marked 'yellow metal safe' if not sure it's GL-4. Put in neutral and raise one rear wheel. Turn drive shaft and push and pull sideways (at right angles) on drive shaft at the U joints. Don't be shy, lean heavily on them they can handle it. Drive shaft should turn only, there should be ZERO sideways slack or movement. Grab the exhaust pipe and pull hard on it in several directions. Does it hit anywhere? Has anything come loose inside the resonator or muffler? Is it properly supported and isolated by hangers? Has a tree branch lodged in there? Are the emergency brake cables secure? Try driving along and pull the emergency brake enough to take up the slack.... does it get quiet? Are the shock absorbers tight? Wheel lugs tight? Quote Link to comment
Smurf510 Posted March 22, 2023 Author Report Share Posted March 22, 2023 Thank you sooooo much for all of that amazing info! I am a rookie and I appreciate the knowledge! Quote Link to comment
iceman510 Posted March 22, 2023 Report Share Posted March 22, 2023 Possible U joint in the drive shaft (as Mike mentioned) would be my suspicion. Quote Link to comment
banzai510(hainz) Posted March 22, 2023 Report Share Posted March 22, 2023 loose drive line bolts ck all bolts U u joint in drive line and half shafts Quote Link to comment
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