Boringchuck

2000 Outback 130k new to me. It didn't have vibration when I boguht it 500 miles ago, now it does. It feels like judder from 25-35, but there's also vibration at highway speeds.Also, it lightly 'clunks' (that I can feel more than hear) when the gas pedal is let off of then put back on. The highway vibration is getting worse. I added the magic goo (Lubegard 19610 Instant Shudder Fix) to the tranny 100 miles ago - no improvement in the vibration from 25-35 mph. I'm thinking it may be the driveshaft carrier bearing or its rubber mount (but 130k is kinda low for that I'd think). My question is: how to diagnose that without pulling the driveshaft. I had the car up and crawled under and pushed up and down on the driveshaft and it moved rather easily - I don't know if the rubber mount should alllow easy movement or if it should be stiffer, it just seemed rather soft to me. The tranny mount just got replaced by a competent mcechanic. Any see-through-brick-walls folk out ther who can diagnose from a distance? : -) Thanks!

I have the opportunity to get some nicer rims (not steelies with crappy platic covers like I have now) and very good Bridgestone tires for cheap. B U T . . . They are 205/70r15, not the 205/60r15 that are on it now (and are the OEM spec). Will I get rubbing? I know my speedo will be a bit whacky, but that's OK with me. The offsets on the rim are 55mm which is fine, so that's OK. Here's the specs differences: (main issue: the 205/70r15 is 41mm or 1.61" larger in diameter)