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68 rear Diff bushings

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Old Jan 19, 2015 | 10:20 PM
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Default 68 rear Diff bushings

I am going to try to replace my rear differential carrier to chassis bushings. Anyone have experience with replacing these. Also I was advised to avoid the poly type bushings. Not sure why and have only seen poly type replacements for sale.
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Old Jan 20, 2015 | 09:13 AM
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Hi g,
Paragon Reproductions shows the rubber differential carrier bushings in their catalogue. #5976
Regards,
Alan
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Old Jan 20, 2015 | 09:47 AM
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I am a big fan of poly bushings but I shied away from using them last spring for motor mounts when I pulled the L-82 for a rebuild and have had a poly differential carrier bushing sitting in my garage for years now since any engine mount/transmission mount that are poly will transmit more vibration than rubber. I would go rubber.
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Old Jan 20, 2015 | 10:16 AM
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If you mean the front snubber bushing, the poly versions are not made correctly (too large). Use rubber.

If you mean the two cross member bushings, there's a 99.9% chance they don't need changing. I've yet to see one that's worn out.
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Old Jan 20, 2015 | 07:14 PM
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Originally Posted by greggome
I am going to try to replace my rear differential carrier to chassis bushings. Anyone have experience with replacing these. Also I was advised to avoid the poly type bushings. Not sure why and have only seen poly type replacements for sale.
The poly bushings have no give to them and can rip the bracket loose from the crossmember.

The correct bushing kit with rubber cushions and bolts can be found here:

http://willcoxcorvette.com/product_i...oducts_id=5391

Replacement instructions can be found here:
http://willcoxcorvette.com/repairand...lp.php?hID=239

If you are talking about the end bushings on the crossmember you can find those at this link
http://willcoxcorvette.com/product_i...oducts_id=5388

If you are working on the crossmember bushings, once the cross member is out of the car we use a press to remove and install the bushings. If you need more help with that just post again.


Willcox

Last edited by Willcox Corvette; Jan 20, 2015 at 07:17 PM.
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Old Jan 20, 2015 | 07:35 PM
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Thanks for the reply and the diagram. Thats just what I needed. Doesn't look too bad to replace. Funny most of the corvette parts guys are selling poly but a lot of folks say they are too large. I'll stick with rubber.



Originally Posted by Willcox Corvette
The poly bushings have no give to them and can rip the bracket loose from the crossmember.

The correct bushing kit with rubber cushions and bolts can be found here:

http://willcoxcorvette.com/product_i...oducts_id=5391

Replacement instructions can be found here:
http://willcoxcorvette.com/repairand...lp.php?hID=239

If you are talking about the end bushings on the crossmember you can find those at this link
http://willcoxcorvette.com/product_i...oducts_id=5388

If you are working on the crossmember bushings, once the cross member is out of the car we use a press to remove and install the bushings. If you need more help with that just post again.


Willcox
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Old Jan 25, 2015 | 09:56 PM
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Any idea what the torque is when replacing these bushings?



Originally Posted by Willcox Corvette
The poly bushings have no give to them and can rip the bracket loose from the crossmember.

The correct bushing kit with rubber cushions and bolts can be found here:

http://willcoxcorvette.com/product_i...oducts_id=5391

Replacement instructions can be found here:
http://willcoxcorvette.com/repairand...lp.php?hID=239

If you are talking about the end bushings on the crossmember you can find those at this link
http://willcoxcorvette.com/product_i...oducts_id=5388

If you are working on the crossmember bushings, once the cross member is out of the car we use a press to remove and install the bushings. If you need more help with that just post again.


Willcox
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Old Jan 25, 2015 | 10:12 PM
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Try 55 - 75 ft-lbs
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Old Jan 25, 2015 | 10:24 PM
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Originally Posted by greggome
Any idea what the torque is when replacing these bushings?
It's specified in the instructions Wilcox posted. (?)
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Old Jan 25, 2015 | 11:16 PM
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No its not specified in instructions>


Originally Posted by Mike Ward
It's specified in the instructions Wilcox posted. (?)
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Old Jan 26, 2015 | 03:24 PM
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Originally Posted by greggome
No its not specified in instructions>
Snubber Cushion torques at 55-75 ft lbs.

Rear outer cushions torque at: 55-65 ft lbs.

Last edited by Willcox Corvette; Jan 26, 2015 at 04:40 PM.
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Old Jan 26, 2015 | 04:24 PM
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Originally Posted by greggome
No its not specified in instructions>
yeah it is..... second page #2 with triangle.... 55-75 ft lbs.
i just did this, got the kit from Willcox... the large washer in the kit is a little wimpy, wont stand the torque without bending. i used the oem large washer.
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Old Jan 26, 2015 | 06:49 PM
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Yep. Sorry missed that 2nd page print.

Thanks for the advice about large washer.




Originally Posted by speedreed8
yeah it is..... second page #2 with triangle.... 55-75 ft lbs.
i just did this, got the kit from Willcox... the large washer in the kit is a little wimpy, wont stand the torque without bending. i used the oem large washer.
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Old Jan 30, 2015 | 07:42 PM
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mission acomplished



Originally Posted by speedreed8
yeah it is..... second page #2 with triangle.... 55-75 ft lbs.
i just did this, got the kit from Willcox... the large washer in the kit is a little wimpy, wont stand the torque without bending. i used the oem large washer.

Last edited by greggome; Feb 1, 2015 at 02:29 PM.
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