Transfer Case Output Bearing
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Thread: Transfer Case Output Bearing

  1. #1
    JUNIOR ROVER
    Join Date
    February 14th, 2007
    Location
    Burbank, CA
    Posts
    533

    Transfer Case Output Bearing

    Looking to replace my t-case's front output bearing, as there seems to be some wiggle there and I have vibration that stems from this area(not the front driveshaft).

    Anyone done this personally?
    I know on the 230's you can pull out the shaft with the bearing attached, but not sure on our Borg-Warners.

    Any info would be greatly appreciated.

    Steve
    2000 4.6 HSE - 3" OME 764f/781r, GB dual cardon
    92 Classic - SOLD
    98 4.0 - OME coil conversion 4" lift, 265/75/R16, Dual cardon, 5150 LT shocks, Cb - SOLD
    98 4.0 - DESTROYED
    95 Defender 90 - SOLD

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  3. #2
    FRESHMAN ROVER
    Join Date
    February 23rd, 2007
    Location
    Adelaide, South Australia, Australia
    Posts
    16
    Hi Steve,

    had a go at this a few months ago. The front part of the housing with the output shaft bearing has the VC in it as well. You can get this out (about 6 bolts I think) with the transfer box in the car, just have to find the right way to hold the housing to get it past the crossmember.... (with a trolley jack under the main part of the transfer box you can drop the crossmember out of the way for easier access)

    You have to remove the front prop (pretty obvious I guess) and take the housing off of the transfer box. You then take the output shaft flange off (might be easier to do while the housing is still attached) as the nut is done up to some insanely high torque figure. Press the VC out of the housing (watch the thread where the flange bolts on). Once the VC is clear, you can tap out the oil seal, remove the circlip and press out the bearing. Do it all in reverse to put it back together. The transfer case rebuild section of RAVE has some nice pictures to look at and some easy to follow steps....

    I changed the bearing in mine for the same reason - a bit of a 'wiggle' in the front output shaft flange. After putting it all back together the wiggle is still there - whatever is causing it is further back inside the 'box - maybe the shaft that goes through the centre diff is worn or there is some slop in the centre diff, a bearing or something! Worse still, with the new output bearing in there, the vibration is more noticeable!

    I'm putting off getting the transfer box rebuilt as long as I can, but I think I'm running out of options....
    Cheers,
    Mark.


    2002 L322 HSE
    2001 ML55 AMG
    1996 CL500

  4. #3
    JUNIOR ROVER
    Join Date
    February 14th, 2007
    Location
    Burbank, CA
    Posts
    533
    Mark,
    Thanks for the reply! That was just the info I was looking for, minus the disheartening info about the lack of change.

    I figured my problem came about because my front diff (two gear piece of s***) seized up just before I got to the shop. Front u-joint snapped, dropping the driveshaft to the road.

    I assumed this had put heavy strain on the front output bearing, with significant backward force. But if you had the same wiggle problem, and no solution from the new bearing, then I guess it's something else.

    Transfer case chain maybe?
    There's no noise though, which probably ruled out the bearing anyway.

    Who knows. Not me.
    2000 4.6 HSE - 3" OME 764f/781r, GB dual cardon
    92 Classic - SOLD
    98 4.0 - OME coil conversion 4" lift, 265/75/R16, Dual cardon, 5150 LT shocks, Cb - SOLD
    98 4.0 - DESTROYED
    95 Defender 90 - SOLD

  5. #4
    FRESHMAN ROVER
    Join Date
    November 22nd, 2006
    Location
    Houston, Tx
    Posts
    50
    When you say wiggle .... side to side or what....

  6. #5
    FRESHMAN ROVER
    Join Date
    February 23rd, 2007
    Location
    Adelaide, South Australia, Australia
    Posts
    16
    Hi Steve,

    sorry to hear about the diff going - don't want to live through that.... broken driveshafts have a habit of coming up through the floor sometimes....

    With a few of us now having diff failures, I'm starting to wonder about the state of the front diff on my truck too (and the back one for that matter).

    When I remove the front driveshaft and drive the beast around a lot of the symptoms I have go away. With your recent mishap and Mark (Pegasus) looking like he's got diff problems too, it might be time to get both of them checked over before I go spending time and money on the transfer box.

    If I do have diff problems, it may explain the wear on the transfer box that causes the slop in the front output shaft - like you've had on your truck.

    All I know is that at the time the driveline vibrations started, the uni-joints got hot enough that the grease in them got so hot it ran out of the seals like it was engine oil. A crook diff could make the whole lot heat up enough for that..... (sorry for the dose of aussie slang there... ) No-one has been able to come up with a good reason for that yet.

    To top this off, now I have coolant on the carpet under the dash, so it looks like new heater core o-rings for me! not that I had anything better to do this weekend.......
    Cheers,
    Mark.


    2002 L322 HSE
    2001 ML55 AMG
    1996 CL500

  7. #6
    JUNIOR ROVER
    Join Date
    February 14th, 2007
    Location
    Burbank, CA
    Posts
    533
    With three wheels on jackstands all tension is off the drivetrain so I can rotate my driveshaft for removal, and the output shaft can be wiggled by hand, 1/8 inch or so of play. When wiggled, you can hear the viscous coupler make slight slurpy noises. The front output bearing is behind the vc, so I assume it's not going to be as solid as the rear output, which does not move sideways.
    The front won't do this with the wheels on the ground though.
    The reason I wonder is I have vibrations increasing with speed, and don't seem to be tied to either driveshaft.
    I have not heard anyone complain about vibrations with a shot vc, although I may be mistaken.
    2000 4.6 HSE - 3" OME 764f/781r, GB dual cardon
    92 Classic - SOLD
    98 4.0 - OME coil conversion 4" lift, 265/75/R16, Dual cardon, 5150 LT shocks, Cb - SOLD
    98 4.0 - DESTROYED
    95 Defender 90 - SOLD

  8. #7
    FRESHMAN ROVER
    Join Date
    February 23rd, 2007
    Location
    Adelaide, South Australia, Australia
    Posts
    16
    Hi Steve,

    there is a bearing on the front of the VC which is just behind the oil seal in the front part of the housing. (This is the one I recently replaced) Behind the VC there is another bearing that supports the front side of the center diff.

    The center diff in the BW transfer case is a bit like a planetary gear set in an automatic transmission (the transfer box rebuild section on the RAVE CD has a great set of drawings showing how it all fits together). The outside teeth that the chain runs on is the diff input, a set of planet gears in a carrier provide the front output and a sun gear in the middle provides the rear output (something like that anyway - sounds pretty close )

    The VC accepts input from the rear output shaft and the front drive as well. The casing of the VC forms part of the "shaft" that goes to the front driveshaft. The front drive flange on my transfer case has a little less play in it than the 1/8" you have since I replaced the bearing, but there is still a little there. If the bearing that supports the center diff has some movement in it (or the diff itself has some movement) even with a new bearing at the front of the transfer case there would still be some play there. Unless boths ends of the VC are supported properly I think there would always be a bit of movement.

    This is seems to be just like the upper part of the steering collumn that I replaced about three months ago. The bearings at both ends were still really good, but the shaft in the middle where the "telescoping stretchy bit" (can't think of a better way to describe it!) was loose. You could grab the steering shaft where the steering wheel and intermediate shaft hooked up at each end and move the whole lot around - made the job of keeping the car going in a straight line a bit interesting!

    When I try to move the front flange I get a slight knocking sound, but I don't remember any slurping noises - maybe the oil seal caused this?

    Most of the driveline symptoms I have are the same as those described by Pegasus in another thread - but there are two more that I find interesting - tight u-turns in a car park (parking lot?) make the driveline 'wobble' and on deceleration I get a rumble in the driveline that is not present if the front shaft is removed. This is really starting to do my head in.......

    You know, I just read back what I've written - man, I could talk the leg off a chair!
    Cheers,
    Mark.


    2002 L322 HSE
    2001 ML55 AMG
    1996 CL500

  9. #8
    JUNIOR ROVER
    Join Date
    February 14th, 2007
    Location
    Burbank, CA
    Posts
    533
    I wasn't able to see a bearing in front of the diff for some reason.
    I find the rave pictures to be a little lacking, usually if I am specifically looking for something, they won't have a picture of it.
    I get rumbling as well, but not from the front since I swapped a cardon in.
    I took out my rear shaft to balance it, but the driveshaft specialist said he couldn't do it due to the big flanges on both ends. Apparently, he found this a little weird. He said it should have 1 big flange and 1 small one.
    Not that I ever noticed.
    So changed out u-joints and reinstalled. Strong vibration at 65-70mph. I guess in the spirit of deduction, I will do a poor mans balance and use a hose clamp to see if shafts the problem. To tell the truth, it feels central but I'll go through the motions.
    2000 4.6 HSE - 3" OME 764f/781r, GB dual cardon
    92 Classic - SOLD
    98 4.0 - OME coil conversion 4" lift, 265/75/R16, Dual cardon, 5150 LT shocks, Cb - SOLD
    98 4.0 - DESTROYED
    95 Defender 90 - SOLD

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