Grinding noise at highway speeds

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Author Message   Jay Kurowski (Jk1eye) New Member Username: Jk1eye Post Number: 14 Registered: 04-2003 Posted on Tuesday, December 30, 2003 - 06:15 pm:    My 96 disco w/ 98k on the clock has started making an interesting sound. While driving between 50-75 mph and letting off the gas about half way there is a grinding noise coming from under the vehicle. Sounds like it is from the front. Slower speeds there is no sound. While under load no sound. Could this be the u-joints? Any help appreciated!   Tarek Khalil (Pharaohdisco) New Member Username: Pharaohdisco Post Number: 7 Registered: 12-2003 Posted on Tuesday, December 30, 2003 - 06:58 pm:    Check your front wheel bearings. Tarek   charles pastrano (Charles) Senior Member Username: Charles Post Number: 368 Registered: 08-2002 Posted on Tuesday, December 30, 2003 - 07:08 pm:    Check Motor Mounts, catalytic converter hitting the frame or bearings. Kind of odd it doesnt do it under load.   Jay Kurowski (Jk1eye) New Member Username: Jk1eye Post Number: 15 Registered: 04-2003 Posted on Tuesday, December 30, 2003 - 07:21 pm:    All wheel bearings new in the last 5-7K. Charles, not under full load but letting off the gas a bit. The Roto needs to be replaced could this create that sound at those speeds?   Chad Meyer (Ccdm3) Member Username: Ccdm3 Post Number: 186 Registered: 07-2002 Posted on Wednesday, December 31, 2003 - 02:31 am:    Jay, I had the same noise at the same speeds as you are describing. It was my front drive shaft.   thom mathie (Muskyman) Senior Member Username: Muskyman Post Number: 514 Registered: 11-2002 Posted on Wednesday, December 31, 2003 - 02:52 am:    its the roto-flex when they are bad they will shake the shit outa things   Jay Kurowski (Jk1eye) New Member Username: Jk1eye Post Number: 16 Registered: 04-2003 Posted on Wednesday, December 31, 2003 - 04:29 pm:    I think I'll start with replacing the roto to U-joint. I am thinking of either going the tom woods route or finding a rear u-jointed shaft off a disco and get the 3 bolt flange. Any suggestions? As I have read, it is cheaper to get a u-jointed disco shaft than a tom woods. What are the pros/cons?