The Stovebolt Site Forums The Parking Lot Big Bolts '53 big bolt 2 speed rear end

I am looking for a replacement vacuum diaphram that controls the Hi / Low range in my differential.
Here is a link to a photo of the part I am talking about. I'm new to this pohto link stuff so let me know if this does not work. <a href="http://s842.photobucket.com/albums/zz344/68buickdude/?action=view&current=0302091132.jpg" target="_blank"><img src="http://i842.photobucket.com/albums/zz344/68buickdude/0302091132.jpg" border="0" alt="'53 truck 2 sp rear end vacuum diaphram"></a> Does anyone have one for sale? Does anyone know of a supplier for this part??
Thank you and best regards to all.

Phil" Plasticman" Stewart

What is the outside diameter of the diaphragm? For my '50 COE I found a diaphragm on Ebay that turned out to be larger than mine, so I wonder if it is the same as yours. For mine, I was able to get the part number and I found one at a Phoenix GMC truck center. They were as shocked as I that it was on the shelf. They surmised that it went on something newer and that is why they had it. I will be at my shop next week and if I have the diameter of your diaphragm, I will check and see if I have the one you have or I can give you the parts number.

Thank you for the information. I will measure the diaphram and get back with you in the next day or so.
Best Regards,
Phil