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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| | | | Joined: Apr 2010 Posts: 48 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2010 Posts: 48 | Hi All I did put in a new diaphram in the two speed on rear end but still does not work any ideas? | | | | | Joined: Nov 2005 Posts: 6,100 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 6,100 | Hy crockbuyer, have you checked the system, is the control valve connected to the engine vacuum. If it is, have you checked for vacuum at the rear axle with the shifter knob in both positions? | | | | | Joined: Feb 2004 Posts: 29,876 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,876 | First, check to see if the 2-speed can be shifted manually by moving the linkage the diaphragm is attached to. If it works that way, then track down the source of the loss of vacuum to the diaphragm. You could have a faulty shift valve, or a leak in one or more of the lines from the valve to the rear axle.
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
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