Subaru vibration 96 subaru legacy 180000 miles.car has a driveline vibration ,not extreme,but worse on hills and acceleration. at 70 mph going up a long grade this vibration suddenly got catastropic- like so bad you feel all 4 wheels are square and falling off.after pulling over and finding nothing visably wrong, wheels tight,no flats[car has brand new tires] I crippled 20 miles home at 30 mph .vibration was bad even this slow .axles have been replaced,wheel bearings are good no noise or play.could it be the center bearing on the non -reparable -expensive as hell -driveshaft?

try getting motor mounts checked or struts or wheel bearings , start with mounts.

Manual transmission subarus have a 'hill holder' feature that is part of the braking system; when you stop on a slight incline, engage the clutch, and step on the brake at the same time, you can take your foot off the brake and the car will not roll backwards. When you go to accelerate and release the clutch the hill holder disengages and allows normal operation.
I suspect that this feature was somehow altered when your brake service was performed. It's activated via a cable that is tied to your clutch cable; the hill holder cable toggles a switch on a mechanism that applies brake fluid to one (or two, depending on model year) brake calipers. I'd start here. If you google hill holder you should find some diagrams of what I'm speaking.
I had a 1995 Legacy with this feature; I disabled when it began malfunctioning. Took 20 minutes as the bolt is in a difficult location but immediately noticed it was much easier to depress the clutch pedal.
Oh yes, my malfunction was so bad (and improperly diagnosed by the local brake 'specialists') that the brakes would lock up while driving and I couldn't move the car! I destroyed my left front brake caliper before figuring out the culprit on my own.

Hope it's an easy fix whatever it is!

would advise getting the steering,brakes,wheel bearings and suspension checked for movement,wear etc , it will only get worse the longer it's left

Speed sensor may be giving a false reading .

Hi,

Is it a manual transmission?

You may have a faulty release bearing in your transmission.

G.

Try changing the fuel filter. If it's been there awhile it's probably starting to clog and won't be able to flow enough fuel for the heavier demands the car has when going uphill or trying to accelerate hard.

I fought with similar problem on my sub for a couple years. Had both a sub dealer and ind mechanic check. Spent lots of money but it still happened. Eventually I solved it by replacing vacuum hoes and putting clamps on them. Seems it was a slight vacuum leak. Worse under load (going uphill) and especially when cold.

Has the car even been in an accident? If so it could be a bent frame (worse case), Otherwise the car could be off balance and needing an alignment (Most likely - best case) :)

check front hubs/bearings