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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!
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| | | | Joined: Nov 2004 Posts: 338 'Bolter | | 'Bolter Joined: Nov 2004 Posts: 338 | I picked up a 12 bolt last weekend for my 40 3/4 ton.
I cracked it open and found out that it has 3.07 gears. This is great luck since I can use a Saginaw behind my 292 rather than figuring out an o/d.
But there's this oil tube that feeds into the top of the center section. What is that for?
Obviously all of my old 40 torque tubes didn't have anything like that. | | | | | Joined: Mar 2012 Posts: 174 Shop Shark | | Shop Shark Joined: Mar 2012 Posts: 174 | | | | | | Joined: Feb 2004 Posts: 29,881 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,881 | That's probably a vent tube that's supposed to end up somewhere inside the frame. A lot of 4WD's had an extended vent system so dummies could go stream-fording without sucking up water into the axle vents.
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!
| | | | | Joined: Nov 2004 Posts: 338 'Bolter | | 'Bolter Joined: Nov 2004 Posts: 338 | | | | | | Joined: Feb 2004 Posts: 29,881 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,881 | Yep, that's the housing vent. Route it up inside a frame rail, secure it with a couple of zip ties with built-in screw holes, and cover the end with a bit of window screen to keep bugs from nesting in the end of the tube.
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!
| | | | | Joined: Mar 2012 Posts: 174 Shop Shark | | Shop Shark Joined: Mar 2012 Posts: 174 | I agree with Jerry! I was thinking that, but have learned to look before I speak or in this case type! I believe you can buy the vent tube cap at your local parts house fairly cheap. Window screen idea works as well! | | |
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