slymo

Update... Massive run out on companion flange so got another diff from the wreckers. Installed tonight and it's now smooth as silk The diff I pulled out had 09 imprezza written on the top so it wasn't the original unit and might have been dropped prior to install. Anyway thanks for the input guys.

Got two new tyres yesterday so I have 4 brand new matching and it didn't change the vibration. Put the car on stands today and ran it up. At low speed I can see a lot of runout on the companion flange at the rear diff but no diff movement. At higher speed, the diff begins to oscillate. No obvious runout on the halfshafts or the output shaft so looks like I have narrowed down the problem. Next I will get a dial indicator, drop the tailshaft and measure the runout on the flange but I am estimating it is at least 20 thou ! I'm guessing that it would be easier to get a used diff from a wrecker than to attempt repair to this one?

Hi Guys and thanks for the input. I will bite the bullet and get two new rear tyres today (same as fronts) and also do the test for torque bind and report back!

Hi guys, Thanks for the replies. I thought torque bind was only on auto trannies? From a cold start the vibe is not as noticeable and it definately gets worse after a few miles of running. If you drive at a constant 33mph the sound is quite loud inside, just like when you have a back window open. Regards, Simon

Hi folks, New member, first post, hoping someone can help! I bought a 11/2002 Subaru Outback 2.5 Manual and have a vibration issue. From 0-30mph it is smooth, from 31-37mph there is a bad drumming and body vibe felt everywhere including a small amount in steering wheel. It occurs under load - no load - any gear - out of gear - brakes on or off - straight ahead or cornering but go over 37mph and it largely disappears. This is a list of troubleshooting I have performed so far... 1) Two new tyres fitted and dynamically balanced on front, rears 50% tread - dynamically balanced 2) New brake pads and rotors all round - adjusted park brakes for no drag 3) All wheel alignment 4) Checked wheel bearings - no play 5) Switched front tyres to rear 6) Dropped tailshaft - u joints/centre bearing good - no play/notches 6) Swapped tailshaft from another car 7) All CV boots intact - minor play in inner joints - no clicking outers I used a gopro to take under car videos at the vibe speed and found the entire rear diff + yolk and rear portion of the tailshaft is oscillating. The centre and front of the shaft is running true. I jammed spacers into the voids on the rear diff bushes and it made it a lot worse. Could it be the diff? Sorry for the long post but I have been searching google for the last month and don't seem to find the exact same issue with a solution. Cheers, Simon