1967 Differential cushion

[Mike H.]

I am having trouble with the front diff. flange hitting the fiberglass above it when I hit bumps with two people in car with luggage on a 1967 air coupe with 327. I have replaced the cushion with no improvement. I have shimmed the cushion with a .125 washer with no improvement. Looking at the lay out of the suspension it doesn't look like the leaf spring would have anything to do with this problem. Any one have any suggestions as to how to solve this problem?
CORDially Mike

[Dennis R.]

Re: 1967 Differential cushion

Hey Mike--I think I found the answer to your question in the March 2009 edition of Corvette Fever in the '53-'67 Tech Q & A. If you do not have access to the back issue, let me know and I can scan and e-mail the answer to you, as it is quite a long and invloved solution.
Hope this helps.

[John H.]

Re: 1967 Differential cushion

I have replaced the cushion with no improvement. I have shimmed the cushion with a .125 washer with no improvement.

Mike -

Did you replace the diff nose bracket cushions with the OEM rubber cushions with the molded-in tubular spacer and molded-on washer, or with one of the "poly" aftermarket setups?

If you used the OEM cushion setup, you probably have a case of the fairly common floorpan sag problem where the luggage stop panel rivets to the underbody have loosened up, causing the floor pan to sag, especially with a passenger aboard.

[Mike H.]

Re: 1967 Differential cushion

I used a OEM cushion. I have now shimmed the cushion .250 to try to pull it away from the floor. The driver and the passanger combined weigh in excess of 425 lbs and then there is luggage and tools for two to three weeks. Probably overloaded also.
CORDially Mike