vehicle, engine, mileage?
if it does it when loaded, then how about suspension - struts, end links, bushings?
rear diffs on Subaru's never fail, i wouldn't let them rebuild it. change the gear oil in it and see if any chunks/metal come out.
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Posted 10 June 2013 - 06:54 AM
vehicle, engine, mileage?
if it does it when loaded, then how about suspension - struts, end links, bushings?
rear diffs on Subaru's never fail, i wouldn't let them rebuild it. change the gear oil in it and see if any chunks/metal come out.
Posted 10 June 2013 - 11:48 AM
vehicle, engine, mileage?
if it does it when loaded, then how about suspension - struts, end links, bushings?
rear diffs on Subaru's never fail, i wouldn't let them rebuild it. change the gear oil in it and see if any chunks/metal come out.
1997 Outback
Auto
270,700
The struts have around 50k and the rest of suspension components appear fine to my armature eye. The car is no where near bottomed out, i have king springs on which really help with that.
Posted 10 June 2013 - 12:08 PM
Spring height does not affect the driveshaft. The biggest factor leading to failure is u-joint angle. Usually because the center joint is either too high or too low in comparison to the front and rear joints.
I do have king springs on the car, so it sits about an 1.5" taller than normal. That might have something to do with my problem. Also I'm pretty sure the first two drive lines failed because i had tires that were having tread separation issues at speed. Do you think there is something else i should be checking for?
Posted 10 June 2013 - 12:20 PM
Spring height does not affect the driveshaft. The biggest factor leading to failure is u-joint angle. Usually because the center joint is either too high or too low in comparison to the front and rear joints.
Does your car have any lift blocks or spacers on the sub-frames? If so you need a spacer of the same height on the center driveshaft support.
The driveshafts also differ slightly between models. A legacy Outback driveshaft center support is designed to sit about 3/4" lower than a driveshaft from an L or GT model.
I wish it had lifting blocks. But no it doesn't
Posted 11 June 2013 - 08:46 AM
Posted 11 June 2013 - 10:49 AM
Posted 11 June 2013 - 07:29 PM
Posted 11 June 2013 - 10:33 PM
They could be giving you the wrong driveshafts. Lengthwise an Outback and a base or L model driveshaft are the same. Only the center mount is different and may not appear so unless careful attention is paid to the mount.
With the correct driveshaft the u-joint angles are near 0 degrees. If you look at the driveshaft from the side of the car, it will appear to be parallel with the floor pan the entire way from front to back.
An incorrect driveshaft, in your case, would appear raised in the center, because the center mount is designed to place the driveshaft about an inh higher in the tunnel. This causes the u-joint angles to be excessive and will cause vibration and, there-fore, wear in the u-joints, leading to early failure.
Check to see if the driveshaft that's in the car looks straight, or if it raises toward the floor pan in the center.
The drive line does appear to be flat. But while i was down there i noticed a loose nut on the transmission mount. I don't know if this could be causing the problem, or caused by it. But when i try to tighten the nut the stud just spins.
Posted 11 June 2013 - 10:56 PM
The stud shouldn't spin, it's part of the trans mount. Maybe it was broken when the new mount was installed.
The gap is normal.
You'll notice your mount does not have as many studs as the one pictured below. The new ones are like yours.
Posted 11 June 2013 - 11:12 PM
Posted 11 June 2013 - 11:16 PM
Well you should probably figure out why the stud spins...
Posted 24 June 2013 - 01:00 PM
Posted 25 June 2013 - 09:54 AM
The problem is still there with the FWD in. I'll check over the rear axles a little more, they are orginal.
EDIT: I was wrong, it does still do it with the FWD fuse in. I just didn't have enough of a load on the car when i tried.
Edited by sario, 26 June 2013 - 07:48 AM.
Posted 25 June 2013 - 10:06 AM
Posted 26 June 2013 - 07:47 AM
I was wrong, it does still do it with the FWD fuse in. I just didn't have enough of a load on the car when i tried.
Posted 08 November 2013 - 12:41 PM
While investigating this problem i found had a rear sticking brake caliper. I rebuilt the calipers and the problem seems to have gone away.
Also replaced the diff fluid, maybe that was the problem. Either way i'm happy. Thanks for everyones help, and I'll report back if the problem reappears.
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