I know this is long after the original thread, but I happened to be looking for information on repairing the two speed diff in my 1957 Chevy 6100 Wrecker. I've been told by the shop that the diaphragm is brittle and cracked. I did find a place that has reproduction diaphrams.

http://www.rebuildersenterprises.com/

http://www.ebay.com/itm/2-SPEED-REAR-AXLE-DIAPHRAGM-GM-3847058-BENDIX-374451-/172542577743

GM 3847058 2 SPEED DIAPHRAGM

This is a brand new diaphragm manufactured for www.rebuildersenterprises.com

Fits GM 2 speed rear axles, Also replaces Bendix 374451.

O.D. is approx 7" I.D. is approx 3"


To see if this unit will fit your application or for technical assistance, feel free to call 800-489-9860.

Rebuilders Enterprises, Inc. is Illinois' Original Remanufacturing Company


57 Chevy 6100 Wrecker http://donovanbray.com/tag/57wrekr