Rear end question

[Nick Boomershine]

I just bought my 77 chevy c20 and got it home and noticed a hise hanging down from the third member and cant figure out where it goes any help would be great

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[legopnuematic]

looks like the diff breather hose, should have a clip to hold it on the frame with a check valve on the end.

 

[Nick Boomershine]

It has a braket with a bolt hole in it

 

[eskimomann209]

Mine mounts to the underside of the bed.

Yeah. You wanna get that up high. With a zip tie. Some people put air filters on them. Some use the check valve. Picture below.

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[Nick Boomershine]

Thanks for the help

 

[AuroraGirl]

Mine mounts to the underside of the bed.

Yeah. You wanna get that up high. With a zip tie. Some people put air filters on them. Some use the check valve. Picture below.

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Do you know if the trans(manual) and transfer cases also used vent hoses? I thought I was crazy under my truck when I saw at least 4 vent tubes in total. Unless there were just hoses stuck in places from my gpa doing stuff over the years. both differentials, for sure.

 

[Nick Boomershine]

Trans is auto no transfer case

 

[Nick Boomershine]

Auto trans no transfer case

 

[75gmck25]

IIRC, there are vent hoses on my transfer case and both axles. The hoses run up high under the truck with a clamp holding them up and a check valve on the end. My TH350 does not have a vent.

Bruce

 

[AuroraGirl]

My trans is a manual, so its not lubricated the same way as an automatic, I would assume possible a vent? Im not an expert. But good to know on TC. Mine are all still mounted properly and have vents. Do those valves ever go bad in your experience?

IIRC, there are vent hoses on my transfer case and both axles. The hoses run up high under the truck with a clamp holding them up and a check valve on the end. My TH350 does not have a vent.

Bruce

 

[Frankenchevy]

The vents can definitely get clogged. Mud, thick grease sludge or bugs, etc.

Things that rotate in oil should have vents so when the oil and air heats up, it doesn’t bypass the seals from thermal expansion.

For the record, my th400, np208, d60 and 14ff all have vent tubes. As @eskimomann209 said, my rear axle mounts to the under side of the bed on one of the bed’s support rails.

 

[85 CA SIERRA 1500]

IIRC, there are vent hoses on my transfer case and both axles. The hoses run up high under the truck with a clamp holding them up and a check valve on the end. My TH350 does not have a vent.

Bruce

I believe that the TH350 vents through the fill tube.