I concur with anon263. When we replaced driver-side axle with an aftermarket one, the vibration was horrible. Most people around me would not believe that was the cause, but as soon as we replaced it with a Subaru OEM rebuilt axle, the vibration disappeared. Get a new one from Subaru if you can afford it. Here's hoping the rebuilt one will last, although some out there have said that it may cause other problems down the line, most likely just because it won't last as long as a new one. The aftermarket axles, with exception of MW, are off just enough in their designs and spline size to allow harmonic vibration to transfer from the engine to the wheel and then your steering wheel when you are stopped at a stop sign and still in gear. The vibration usually goes away when you put it in neutral or park. In my case, I even thought I detected some strange vibration when driving.
SOURCE: 2003 subaru outback engine vibration in gear
Did you recently replace the axles on the vehicle? This problem commonly occurs in Subarus when you replace the axles with non-OEM parts. The only fix seems to be to swap out the axles for OEM parts. Search the forums at subaruoutback.org for many stories of the same condition and some theories on why non-OEM axles cause the problem.
SOURCE: 97 subaru legacy outback 2.5 vibration only at idle in gear
I would suspect a mount. Either motor or trans. Also check lateral mount on top of motor to firewall. Good luck and have a great day.
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