Volvo AWD S70 Forum

INDEX FOR 10/2025(CURRENT) INDEX FOR 9/2004 S70 INDEX

[<<]  [>>]


THREADED THREADED EXPANDED FLAT PRINT ALL
MESSAGES IN THIS THREAD




  REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

S70 ALL-WHEEL-DRIVE SYSTEM S70 1999

posted by  pickS70 on  Mon Jun 22 18:13 CST 2009
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Tue Jun 12 23:38 CST 2012
[RELATED]

I own a '99 S70 AWD with 123k miles, and was just wondering what is the

reliability like for this model/year all-wheel-drive system???

ive heard some horror stories about all-wheel-drive systems on S70's going south!

PLEASE HELP








  •   REPLY TO THIS MESSAGE    PRINT   SAVE 

    S70 ALL-WHEEL-DRIVE SYSTEM S70 1999

    posted by  Oliver on  Wed Jun 24 06:01 CST 2009
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Tue Apr 24 15:09 CST 2012
    [RELATED]

    I also have a 99 S70 AWD. Purchased this car about a year ago with 120K on it. At about 138K I noticed a rather abrupt jerking feeling when I turned the steering wheel hard to the left or right (thought the whole drive train was locking up). Long story short, there is a component that connects the rear drive shaft to the rear differential called a Viscosity Coupling (VC). This is a mechanical unit filled with friction disks and silicone that senses when the front differential is loosing traction and redirects torque to the rear differential. Overall a pretty reliable AWD system - but when there are problems they get expensive. A replacement VC runs about $1,600 from the dealer plus three hours labor to install. I have not found anyone that can refurbish or rebuild one.

    The good news is most on this board agree that no serious harm is done if you just keep driving the car. Others have recommended removing the rear drive shaft altogether and just convert over to FWD....

    I am now at 148K and it is annoying but no big deal. car drives great with this one exception and feels good on the road.. Plan to drive it till it dies...

    PS . This board is a great resource and can help with almost anything that comes up...

    Oliver
    Over a million Volvo miles and still smiling :-)








  •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

    S70 ALL-WHEEL-DRIVE SYSTEM S70 1999

    posted by  KlausC on  Tue Jun 23 04:31 CST 2009
    Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
    last visit: Fri Oct 24 10:15 CST 2014
    [RELATED]

    When was the last time you flushed the tranny or the bevel gear oil? If you like to play in the snow and ice by sliding your car around until it hits clear pavement, beware, the gears do not like sudden torque.

    Klaus
    --
    Common sense trumps a PhD








    •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

      S70 ALL-WHEEL-DRIVE SYSTEM S70 1999

      posted by  pickS70 on  Tue Jun 23 16:11 CST 2009
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Tue Jun 12 23:38 CST 2012
      [RELATED]

      i do have the tranny fluid done ever 30k but i have never heard of the bevel gear.

      what does that do? and when should i have the bevel gear fluid done??








      •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

        S70 ALL-WHEEL-DRIVE SYSTEM S70 1999

        posted by  KlausC on  Tue Jun 23 17:02 CST 2009
        Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
        last visit: Fri Oct 24 10:15 CST 2014
        [RELATED]

        The bevel gear is the transfer case, using 4wd lingo. It sits directly behind the tranny and connects the propeller shaft to the FWD. The fluid should be flushed as often as the tranny. It is not tranny fluid.

        Klaus
        --
        Common sense trumps a PhD








        •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

          S70 ALL-WHEEL-DRIVE SYSTEM S70 1999

          posted by  pickS70 on  Tue Jun 23 17:12 CST 2009
          Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
          last visit: Tue Jun 12 23:38 CST 2012
          [RELATED]

          ok thank you. i dont think i have ever changed that, but nothing has happend abnormally yet with driving.

          any major consequences, if i havet changed the bevel fluid this far, that could happen if they havent happend already?








          •   REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

            S70 ALL-WHEEL-DRIVE SYSTEM S70 1999

            posted by  KlausC on  Tue Jun 23 17:25 CST 2009
            Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
            last visit: Fri Oct 24 10:15 CST 2014
            [RELATED]

            The gear oil gets old and burned, loosing its effectiveness. It is purely mechanical, but when it fails it will overheat and boil over. Volvo shops are now familiar with drilling out one of the bolt holes to make a drain.

            Klaus
            --
            Common sense trumps a PhD







<< < > >>



©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.