Tranmission will not engage Subaru Outback 2006.

SOURCE: my airconditioner in my 2004 subaru outback is

you need manual gauges to do a pressure test

SOURCE: needdrive belt diagram for Subaru outback 3.0

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SOURCE: cabin air filter on a 2006 subaru outback limited

The cabin air filter is behind the glove box. The first thing you need to do is empty the glove box. (2) you need to remove the side panel that runs along the side of the shifter, it is a long panel and has on clip near the firewall, the clip will have a phillips head on it, just back it out and remove this panel. Then remove all the bolts (10MM) holding the glove box on, The glove box is will stay up because it has two hings that run into the sides of dash. All you need to do is squeeze the glove box untill it pops out and the glove box will be out. There is no need to unhook the wiring for the light bulb just let the glove box hang on the floor. Now you will see a black cover that is held on by 4 small metal clips, remove these and pull the cabin air filter out. when you reinstall the new one, make sure you put it in with the air flow arrows pointed in the right direction or else you will cause blockage. reinstall and enjoy your new heppa filter

SOURCE: Subaru won't start

You've got to assume that the trans oil change is unrelated. With the key in the run position see if the wipers work, if not the battery is dead. Otherwise, try rocking the car back and forth while in park and then hope for a miracle. If all fails, get out the volt meter and start measuring voltages at the starter and the power pack (coil).

SOURCE: 2000 Subaru Outback manual transmission rebuild

I would want to see that for myself, or get a second opinion. That really sounds suspicious since they claimed there was rust in a box that was mostly filled with oil. And I can't see any logic in paying a lot of money to fix a transmission that is working. Why don't you take it to another shop and ask them to change the transmission oil, and to save the old oil for you to look at. It would be even better to change the oil yourself. Don't tell the dealer what you are doing. The best thing would be to just pick up your car, as is. If it is a scam, they could put some stuff in the transmission if you give them time to do it. In fact, they may have already done that. I can't say it's a scam, but it sounds like it could be if you haven't done anything that would have broken off teeth in the transmission. And if teeth are broken off you should be able to hear it while accelerating at low speed in each gear.

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