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Old 09-14-2007, 03:12 PM   #1
fastenova
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Member#: 38829
Join Date: Jun 2003
Chapter/Region: NWIC
Location: Tigard, OR
Vehicle:
Not your usual 1997
Legacy GT

Default SuperPro 'rear' rear differential mount bushings

I just got a set of the rear diff mount bushings that go in the rear subframe (NOT the outrigger bushings). They are of a one-piece design. Curious if anyone has any helpful hints for installing these. Looks like I gotta heat up the old rubber bushings a bit, pop them out, then grease these up and force them in.

I'm planning on just dropping the rear diff and doing this on the car. Any suggestions?

Aaron
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Old 09-14-2007, 09:58 PM   #2
elsanto
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1989 M3
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are these the four mounting points on the outside of the diff carrier?

if so those need to be pressed out, they have a metal sleeve on the outside and inside of the bushing. I tried to burn mine out and learned this the hard way..
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Old 09-15-2007, 06:29 AM   #3
fastenova
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Haha, well, after several hours of turning wrenches, cussing, rolling around in grease and burnt rubber, I have poly rear diff bushings installed in the rear subframe. Only problem is, the subframe is out of the car

I was thinking (don't ask me why) that I might be able to use a c-clamp to get these bushings in. No way. I dropped the rear diff and exhaust, applied some heat, got part of the old bushings out, then realized I had no good way to get the rest of them out. I decided to take out the rear subframe, so I could clean the old stuff out and figure out how to get the new ones in. Well, my car is ten years old, and the rear suspension has never been apart. I ended up totally destroying one of the lateral link bushings, and cussing a lot at another one, and removing the subframe with all four links attached. I did this with the differential supported on a jack still hooked up to the CV axles. Yeah, I know I'm nuts.

After pressing in the new bushings using my old school drill press and some elbow grease, I decided to wait until I could get some new bushings for the lateral links before I did anything else.

Moral of the story: If you think it's a 2-3 hour job, it's probably a 6 hour job. If you want to upgrade your rear diff mount bushes, plan on pulling the rear subframe and be willing to get many other replacement parts too.

At least now I have a 'logical' reason to upgrade the rear suspension!
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Old 09-15-2007, 11:55 PM   #4
elsanto
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^ haha good to hear you got them out. I just dropped them at the machine shop. hopefully will get them monday all clean of that soft rubber
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Old 09-17-2007, 12:42 PM   #5
fastenova
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Legacy GT

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You are going to leave the outer sleeves in, right? I remember reading somewhere that these bushings are just meant to reuse the existing outer sleeve.

To confirm, I measured ID of both the sleeve and the hole in the subframe. Hole in subframe would give about 25 thousandths extra play over the OD of the bushing at it's largest diameter, so I knew that the sleeve had to stay in there.

Aaron
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