What is this hose for? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

BigRed · 12-22-2002, 05:24 PM

While changing out my differential oil today, I noticed a hose coming out of the top of the diff and it goes up to a clamp on the frame. The hose is plugged right past that clamp on the frame. At first, I thought this might be a fill line, but I don't think so. The hose was split so I replaced it. What is this hose for?

Also, I refilled my diff through the plug on the passenger side of the diff case. I basically filled it through that hole until it started seaping out. Is that as full as I need to fill it?

Thanks,

**old Rusty C10** · 12-22-2002, 05:40 PM

as far as i know you fill the differential to the top of the bolt til she starts leaking like ya did. The hose is actually a vent of some kind so there isnt alot of condensation or junk in the differential dont sweat it lol you did it right

BigRed · 12-22-2002, 09:45 PM

Cool, thanks for the reassurance! I was thinking it was some kind of vent, except it's plugged.

Thanks again!!

hrc200x · 12-22-2002, 10:21 PM

I've heard that plugging off the hose will blow seals because the air has to escape somewhere. Is it true?

gchemist · 12-22-2002, 10:51 PM

Si Senor.

85 K5 · 12-23-2002, 09:04 AM

The plug at the end of the hose is probably actually a vent.

BigRed · 12-23-2002, 09:25 AM

You're right 85 K5, it is. It just has a dust cap on the end of the vent to keep crap out of it. Noticed that after looking a little closer at it. Thanks!

12-22-2002, 05:24 PM	#1
BigRed Registered User Join Date: Jun 2002 Location: DFW, TX Posts: 1,680	What is this hose for? While changing out my differential oil today, I noticed a hose coming out of the top of the diff and it goes up to a clamp on the frame. The hose is plugged right past that clamp on the frame. At first, I thought this might be a fill line, but I don't think so. The hose was split so I replaced it. What is this hose for? Also, I refilled my diff through the plug on the passenger side of the diff case. I basically filled it through that hole until it started seaping out. Is that as full as I need to fill it? Thanks, __________________ Scott Shelbourne

12-22-2002, 05:40 PM	#2
old Rusty C10 Robert Olson Transport Join Date: Oct 2002 Location: recent transplant to NC USA Posts: 20,310	hoses as far as i know you fill the differential to the top of the bolt til she starts leaking like ya did. The hose is actually a vent of some kind so there isnt alot of condensation or junk in the differential dont sweat it lol you did it right __________________ Bob 1951 International running on a squarebody chassis "If a man's worth is judged by the people he associates himself with, then i am the richest man in the world knowing some of the fine people of this board" http://67-72chevytrucks.com/vboard/a...t.php?f=25&a=9 (you can review the site rules here!) PM Me for your vehicle/parts hauling needs in the North East US or see my Facebook page Robert Olson Transport Live each day to the fullest.. you never know when fate is going to pull the rug out from under you... I hate cancer!!

12-22-2002, 09:45 PM	#3
BigRed Registered User Join Date: Jun 2002 Location: DFW, TX Posts: 1,680	Cool, thanks for the reassurance! I was thinking it was some kind of vent, except it's plugged. Thanks again!! __________________ Scott Shelbourne

12-22-2002, 10:21 PM	#4
hrc200x Registered User Join Date: Sep 2002 Location: Minnesota Posts: 203	I've heard that plugging off the hose will blow seals because the air has to escape somewhere. Is it true? __________________ '75 Chevy 3/4 4x4, 6" suspension lift, 3" body lift, 3" lifted gas tanks, '83 cab, '88 clip, 35" cooper tires, American Racing Baja rims, 350, 700r4, 208.

12-22-2002, 10:51 PM	#5
gchemist BAD BOW-Silverado XST Join Date: May 2000 Location: Senior Member from Austin, TX Posts: 6,431	Si Senor. __________________ Gerardo a.k.a. Mad Chemist Silverado XST videos

12-23-2002, 09:04 AM	#6
85 K5 Registered User Join Date: Nov 2002 Location: Spring TX Posts: 113	The plug at the end of the hose is probably actually a vent. __________________ 350 Crate 10 bolt 3.73 2.5 lift 32x11.50 1904 Edelbrock http://www.oplnk.net/~spirit/K5front.jpg

12-23-2002, 09:25 AM	#7
BigRed Registered User Join Date: Jun 2002 Location: DFW, TX Posts: 1,680	You're right 85 K5, it is. It just has a dust cap on the end of the vent to keep crap out of it. Noticed that after looking a little closer at it. Thanks! __________________ Scott Shelbourne

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