Does tranny & TC have vents? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

gman · 08-03-2003, 04:38 PM

May sound like a stupid question but since I've never had either out of the truck.........? Does the transfer case or 4 speed tranny have vents for them? Like the front and rear differentials. And if they do, can anyone tell me where to find them and if they are able to be reached?

Changed fluids for both about 4 months ago........the TC looks just like when I put it in, honey colored........the tranny fluid looks much darker so I was wondering if a missing vent might be contaminating it. Used same 80W-90 Valvoline syn blend in both. Any help appreciated.
Thanks.

**Yukon Jack** · 08-04-2003, 10:08 AM

Here's a link to a pic of the vents on my SM465 and Rockwell T221 - I circled the vents.

Pic of vents

gman · 08-04-2003, 10:20 AM

Thanks for the picture!!! Very nice............That wasn't what I had envisioned they would look like but......Do those just screw out? Both of my cases are pretty much covered in crud so I'll have to really get after it. In case I need one, are those vents readily available and from where, if by chance you know? Thanks again.

Blazer1970 · 08-04-2003, 12:22 PM

Most of those type of vents that I have seen are just pressed in. If you want to plumb them to a higher location, you need to tap the holes with an NPT tap.

bouncytruck · 08-04-2003, 01:38 PM

My NP 203 has a short tube with a one way valve on the top. It is probably about 4" long.

08-03-2003, 04:38 PM	#1
gman Registered User Join Date: Nov 2000 Location: Ogden, Utah Posts: 290	Does tranny & TC have vents? May sound like a stupid question but since I've never had either out of the truck.........? Does the transfer case or 4 speed tranny have vents for them? Like the front and rear differentials. And if they do, can anyone tell me where to find them and if they are able to be reached? Changed fluids for both about 4 months ago........the TC looks just like when I put it in, honey colored........the tranny fluid looks much darker so I was wondering if a missing vent might be contaminating it. Used same 80W-90 Valvoline syn blend in both. Any help appreciated. Thanks. __________________ 72 Chevy SWB Custom Deluxe K10, 350/SM465, PS, PB, Fact. Air 2000 Harley...Wide Glide

08-04-2003, 10:08 AM	#2
Yukon Jack Post Whore Join Date: Feb 2000 Location: Rose Hill, KS, USA Posts: 12,686	Here's a link to a pic of the vents on my SM465 and Rockwell T221 - I circled the vents. Pic of vents __________________ 1970 Blazer with a 400 sbc and 4" lift 1980 Pontiac Trans Am, 455 Oldsmobile 2012 Kawasaki Concours 14

08-04-2003, 10:20 AM	#3
gman Registered User Join Date: Nov 2000 Location: Ogden, Utah Posts: 290	Thanks for the picture!!! Very nice............That wasn't what I had envisioned they would look like but......Do those just screw out? Both of my cases are pretty much covered in crud so I'll have to really get after it. In case I need one, are those vents readily available and from where, if by chance you know? Thanks again. __________________ 72 Chevy SWB Custom Deluxe K10, 350/SM465, PS, PB, Fact. Air 2000 Harley...Wide Glide

08-04-2003, 12:22 PM	#4
Blazer1970 Registered User Join Date: Dec 1999 Location: Old Mission, MI, USA Posts: 2,507	Most of those type of vents that I have seen are just pressed in. If you want to plumb them to a higher location, you need to tap the holes with an NPT tap. __________________ Tim

08-04-2003, 01:38 PM	#5
bouncytruck SKINNY TIRES RULE! Join Date: Sep 2001 Location: Bothell, WA Posts: 11,038	My NP 203 has a short tube with a one way valve on the top. It is probably about 4" long. __________________ bouncytruck 1972 K5 The Hauler 1994 K1500 Suburban The Daily2010 Kia Soul Wife's Ride2014 Fiat 500L



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.