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07-17-2016, 12:56 AM
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#1 |
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Registered User
Join Date: Jun 2014
Location: San Jose, CA
Posts: 8
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Front differential vacuum tube
Where does the front differential vacuum tube lead to and attach to?
Mine just ends near the engine into mid air. That can not be good. Please help....Thanks! 1972 Blazer |
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07-17-2016, 01:30 AM
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#2 |
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Senior Member
 
Join Date: Jan 2001
Location: Orem, Utah
Posts: 7,805
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Re: Front differential vacuum tube
It's a vent tube, not a vacuum. It just provides atmospheric vent so pressure doesn't build up and cause a leak.
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07-17-2016, 05:29 AM
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#3 |
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Registered User
Join Date: Apr 2011
Location: Klein Texas
Posts: 3,852
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Re: Front differential vacuum tube
Install a vent cap on the hose end. The hose should be clamped to top of the frame
__________________
My Classics: '72 K20 Suburban + '65 Dodge Town Wagon '72 Corvette Roadster +'67 Corvette Roadster '73 Z-28 Camaro '63 Ford SWB Uni Pickup '50 Ford Coupe |
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07-17-2016, 03:27 PM
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#4 |
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Registered User
Join Date: Oct 2009
Location: Great White North
Posts: 1,520
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Re: Front differential vacuum tube
Rh frame rail where the upward bend is in the upper surface.
I think may be shared with same hole as battery cable from above?
__________________
Jeff. '72 Blazer K5 "Camshaft opinions are like belly buttons; everyone has one and no two are alike" My Blazer Build: http://67-72chevytrucks.com/vboard/s...d.php?t=626752 My Engine Build: http://67-72chevytrucks.com/vboard/s...d.php?t=637336 |
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07-18-2016, 09:09 PM
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#5 |
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K5drive
Join Date: Nov 2004
Location: burnaby BC Canada
Posts: 809
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Re: Front differential vacuum tube
Anyone know where to buy the vent cap ?
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07-18-2016, 09:32 PM
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#6 | |
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Registered User
Join Date: Apr 2012
Location: Lehi,Utah
Posts: 1,330
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Re: Front differential vacuum tube
Quote:
http://www.ebay.com/itm/1964-81-GM-a...dW5ERc&vxp=mtr Last edited by bluek5; 07-18-2016 at 09:35 PM. Reason: Picture |
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07-18-2016, 10:25 PM
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#7 |
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Registered User
Join Date: Mar 2015
Location: Ontario Canada
Posts: 1,500
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Re: Front differential vacuum tube
The donor 2003 4X4 GMC Sierra I got my engine from used the same vent plugs, so you can grab one from the wreckers.
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07-21-2016, 12:17 AM
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#8 |
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Registered User
Join Date: Oct 2009
Location: Great White North
Posts: 1,520
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Re: Front differential vacuum tube
Mine were 5/16. I bought some dorman part that look identical. I'd imagine that you could get them at any jobber supply place like Napa, etc.
__________________
Jeff. '72 Blazer K5 "Camshaft opinions are like belly buttons; everyone has one and no two are alike" My Blazer Build: http://67-72chevytrucks.com/vboard/s...d.php?t=626752 My Engine Build: http://67-72chevytrucks.com/vboard/s...d.php?t=637336 |
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07-22-2016, 12:04 AM
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#9 |
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Carpe manana
  
Join Date: Dec 2010
Location: Eau Claire, WI
Posts: 12,295
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Re: Front differential vacuum tube
These are still available through GM also...
__________________
1972 K5 CST Highlander Blazer: http://67-72chevytrucks.com/vboard/s...d.php?t=708547 1972 K20 Cheyenne Super: http://67-72chevytrucks.com/vboard/s...d.php?t=528308  Members met: ORANGBLAZ, 2003 silverado, MikeCofield, BB72CHEVKT, Duncan&Son, Sameyrasmea72, THENEWMEXICAN, HotRod C/10, brianthelion02, Sport/Truck, ryanroo, michael bustamante, Dirt's72, Already Gone, WestButteTruck, 57taskforce, Moreyel, painterljp, AASmedic, SoCoC10, Lumaestas, carbuff382, Chevyland
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