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Old 08-09-2011, 02:45 PM
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3M window weld for diff bushings?

I'm gonna tackle the 3 diff bushing in the front end this weekend. Hope to cure my clunking. I know some guys have filled the gaps in the bushing with window weld. Can anybody speak from experience if this is a good idea or not? I know it will firm up the bushing but I don't want any additional vibes being caused by it. So has anybody had experience with filling their diff bushings and its success?
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Old 08-09-2011, 03:37 PM
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Re: 3M window weld for diff bushings?

That's pretty interesting. I just read up a little online about it. Seems like alot of Subie and GTO owners use this trick with good results. First I've heard of it. So you just get a caulk gun and fill in the gaps. I'm assuming you just leave the diff in place?
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Old 08-09-2011, 04:16 PM
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Re: 3M window weld for diff bushings?

You can, but I'm replacing the mount as well. I'm thinking if filling the gaps in the new mount with the window weld. That's where I heard about it first was the gto forums(got a built '04). Only thing I'm worried about is the transference of vibes with the added poly in the bushing.
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Old 08-09-2011, 04:24 PM
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Re: 3M window weld for diff bushings?

I wouldn't think there would be any gaps after you install the bushings.

I have to do this in the near future as well. I've heard most people just pull the drive shaft and leave the half-shafts attached to the diff. Apparrently the diff will drop just enough to rotate it so you can get to all the bushings w/out removing the diff completely.

Anyone done this??
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Old 08-09-2011, 04:47 PM
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Re: 3M window weld for diff bushings?

The diff will spin and the pinion will droop so you can tackle it in the vehicle. The bushings stock have a gap on either sides of the actual rubber attached to the eyelet. That's where you would put the window weld. I've heard of some guys on the SRT8 forums doing it as well. Haven't heard any feedback though.
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Old 08-09-2011, 06:44 PM
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Re: 3M window weld for diff bushings?

Ive heard of the window weld. I used some epoxy on the front bracket bushing as it had some small cracks(at the time the part was back-ordered). I filled the crescent shaped holes in on both sides. Its been holding up very well!

I wouldn't do it to a isolator bushing that has been completely torn though.
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Old 08-09-2011, 07:02 PM
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Re: 3M window weld for diff bushings?

[QUOTE=viking757;462929]Ive heard of the window weld. I used some epoxy on the front bracket bushing as it had some small cracks(at the time the part was back-ordered). I filled the crescent shaped holes in on both sides. Its been holding up very well!

I wouldn't do it to a isolator bushing that has been completely torn though.[/QUOTE

Are you talking about the front mount on the diff you epoxied? I have all three new bushings coming and plan on doing the window weld on the main pinion isolator bushing(the new one) as it is the one that takes the brunt of the torque. I def. Wouldn't use it on an old torn one. My main concern is that hopefully it won't be too stiff when cured and cause driveline vibrations to be felt while driving.
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Old 08-09-2011, 07:10 PM
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Re: 3M window weld for diff bushings?

Quote:
Originally Posted by mrtosh View Post
Are you talking about the front mount on the diff you epoxied? I have all three new bushings coming and plan on doing the window weld on the main pinion isolator bushing(the new one) as it is the one that takes the brunt of the torque. I def. Wouldn't use it on an old torn one. My main concern is that hopefully it won't be too stiff when cured and cause driveline vibrations to be felt while driving.
Number 6's bushing is the one I did as the jeep stealer was out of stock and the bushing had a very small crack and was losing a bit of its rigidity. You may get a small increase in vibration as you will be stiffening up the bushings integrity, but I think the increase in vibration would be almost null. Thinking back on it I should have put epoxy in the other 2 bushings to have the piece of mind.
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File Type: jpg front bushing.jpg (157.4 KB, 55 views)
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Old 08-09-2011, 07:19 PM
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Re: 3M window weld for diff bushings?

Yup got one of those spendy little buggers coming with the other two isolators. I figure if it vibes bad i can. always drill it out later.
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Old 08-09-2011, 11:06 PM
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Re: 3M window weld for diff bushings?

Yea those brackets aren't cheap. Let me know how it turns out!
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Old 08-14-2011, 11:22 PM
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Re: 3M window weld for diff bushings?

I just did this to all three of my front diff bushings. It solved my front end vibration/noise/clunking issue. I brought mine to a transmission repair shop as 2 of the bushings had to be pressed in. Shop charged $260.00
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Old 08-14-2011, 11:36 PM
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Re: 3M window weld for diff bushings?

Quote:
Originally Posted by Skinner5.7 View Post
I just did this to all three of my front diff bushings. It solved my front end vibration/noise/clunking issue. I brought mine to a transmission repair shop as 2 of the bushings had to be pressed in. Shop charged $260.00
The problem is that eventually those bushings will eventually wear out again. So that's why the window weld/epoxy idea was introduced to enhance their strength as to provide a permanent solution. I just only did one bushing with it but mrtosh will be doing all three.
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