1988 - 1998 (GMT400) Section for all discussion related to the 1987-1998 Chevrolet and GMC trucks.

rear diff. vent

Old Aug 7, 2023 | 4:08 PM
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Default rear diff. vent

i have 1996 chevy short box .my vent tube is rusted off. i pluged it off and added new one in main diff. housing. thought it was good idea but was not . i ran vent hose up into frame with vent cap . after driving for a few days i am blowing gear lube out vent. i did not want to drill original vent out because i would have to remove ring gear and axles to get metal shavings out of axle tube. the vent i added is on top and in middle of diff. housing. any one have a new idea let me know
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Old Aug 7, 2023 | 6:53 PM
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Originally Posted by hunterjo50
the vent i added is on top and in middle of diff. housing.
that's right where the lube gets slung around by the ring gear. Put the hole in a better spot.
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Old Aug 7, 2023 | 7:56 PM
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i think you are 100% right. any suggestions. looking for some one that solved the same venting problem.
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Old Aug 7, 2023 | 8:53 PM
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Old Aug 8, 2023 | 6:19 PM
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i understand that is where it is supposed to be , but i am looking for ideas where i might put it
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Old Aug 8, 2023 | 7:20 PM
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Maybe clean original spot down to bare metal and re-attach a vent using something like JB Weld, then paint to protect the repair

Last edited by Rednucleus; Aug 8, 2023 at 10:27 PM.
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Old Aug 8, 2023 | 10:03 PM
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that is a thought. thanks
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Old Aug 9, 2023 | 3:34 AM
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well what about the same spot ... on the other side?
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Old Aug 9, 2023 | 7:13 AM
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the other side is same problem i have to take axle and ring gear out to clean . i still might have to do that
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Old Aug 9, 2023 | 11:40 AM
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How did you manage to add a new vent without concern of metal shavings getting into the diff?

I don’t think you have much choice but to remove the axle for a proper repair - besides providing a vent, that bolt also retains the brake tee - if the vent nipple rusted off then it’s likely the bolt portion isn’t in much better shape and needs to be replaced anyway.
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