Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks



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#291863 10/19/13 10:54 AM
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Andys29 Offline OP
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I'm going to change the rear axel seal's to the new lip seal type and would like to know the best place is to install a vent for the rear end. I have a vent assy. from a Mack truck that is a 1/8 pipe thread and will work just great. I tried a search and came up with nothing.

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Andys29 #291864 10/19/13 11:05 AM
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You can install the vent on top of the axle housing midway between the third member and the brake backing plate.

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The Mangy Old Mutt

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Andys29 Offline OP
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Thank you JD but I'm not sure what you mean about the third member

Andys29 #291871 10/19/13 01:41 PM
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I believe he is referring to what I would call the axle housing aka "banjo housing". When I took my 51 rear axle out I found that the housing had a breather that is identical to the Mack one. It is located about 1/2 way between the differential center and the left rear wheel.


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m006840 #291876 10/19/13 02:57 PM
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Andys29 Offline OP
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I was thinking that it might be something on the body that he uses for a reference

Andys29 #291902 10/19/13 09:03 PM
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The "third member" is the ring and pinion assembly which is also called the "differential carrier" or the "pumpkin".

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Andys29 Offline OP
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OK. Thanks to both of you for the information and the help.

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I assume this 3rd member term comes from the old mechanics referring to the Engine as first member, trasnsmission as second and rearend as 3rd member of the drivetrain. Of course on todays front wheel drive cars I don't know if the terms are used anymore.

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Is it possible to install a vent on the differential cover? I need to replace the gasket and would take the opportunity to install a vent at that time. Thanks

Jim.

JimmyV #291939 10/20/13 10:11 AM
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I wouldn't. With the ring and pinion spinning the oil tends to fly around and the vent would probably leak. Also, there is a an oil dipper inside the differential at it throws the oil all over in that area.

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JimmyV #291989 10/20/13 09:36 PM
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After replacing inner and outer seals plus double sealed bearings on my 31, I took advice from another member and drilled a 1/4" hole in top diff cover bolt

and than drove it for about 50 miles and checked for leak. Nary a drop of rear end grease to be seen from that 1/4" hole. The temp that day was right at 95 and I ran it between 40 and 45. Hope my luck continues with rear end repairs.

Jim.

jdv123 #291994 10/20/13 10:37 PM
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Whoops -- Belay that -- I meant a 1/8" hole - not a 1/4" in hole. Sorry about that!!

Jim.

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JD and jdv, thanks for the input. Much appreciated.

Jim.


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