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2 speed quit in 1970 C60
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Jim in Sask
Posted 1/25/2017 20:04 (#5794212 - in reply to #5794022)
Subject: RE: 2 speed quit in 1970 C60

I've had to replace the rubber diaphragm at least once, possibly twice. Simple job. Last time I replaced it the diaphragm was still available from our local GMC dealer but that was a while back.

Attached is the page from the parts manual. A couple part numbers apply to your truck depending on axle. P/N 3847058 for 65-74 trucks with Bendix 374451 or P/N 3874330 for 66-74 trucks, all ex. 16,000-lb. axle.

(C:\Documents and Settings\Owner\My Documents\My Pictures\Jan25473 (Medium).JPG)

Attachments C:\Documents and Settings\Owner\My Documents\My Pictures\Jan25473 (Medium).JPG (54KB - 104 downloads)
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