The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1967 - 1972 Chevrolet & GMC Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 02-19-2014, 09:21 AM   #1
72chevylwbmo
Registered User
 
Join Date: Jul 2013
Location: Springfield MO
Posts: 66
Axle Leak How to Fix

Good morning everybody. Working on my son's truck again. I believe the truck has a 12 bolt rear end, can someone verify for me please. Also, on the passenger side where the tube goes into the pumpkin housing there is gear oil gathering there. Is this because it is leaking there? Do I weld this up to fix the leak? Sorry for the crappy picture but it was late when I took the picture.
Attached Images
 
72chevylwbmo is offline   Reply With Quote
Old 02-19-2014, 09:51 AM   #2
72_swb
Registered User
 
72_swb's Avatar
 
Join Date: Feb 2014
Location: dallas area
Posts: 221
Re: Axle Leak How to Fix

Yep it has 12 bolts. I've never seen the tubes leak where it meets the pumpkin but I'm sure they can. people do weld the tubes for strength so it can be down. I think the pumpkin is cast so it's harder to weld
72_swb is offline   Reply With Quote
Old 02-19-2014, 10:27 AM   #3
72chevylwbmo
Registered User
 
Join Date: Jul 2013
Location: Springfield MO
Posts: 66
Re: Axle Leak How to Fix

The reason that I ask is because I have read that it has something to do with the shape of the housing, not always the number of bolts that are holding the cover on. I was just wanting to make sure. Thanks.
72chevylwbmo is offline   Reply With Quote
Old 02-19-2014, 10:37 AM   #4
67c10rustbuket
Registered User
 
67c10rustbuket's Avatar
 
Join Date: Apr 2011
Location: Mustang, Oklahoma
Posts: 2,806
Re: Axle Leak How to Fix

Quote:
Originally Posted by 72chevylwbmo View Post
The reason that I ask is because I have read that it has something to do with the shape of the housing, not always the number of bolts that are holding the cover on. I was just wanting to make sure. Thanks.
True, a "car 12 bolt" is round while a "truck 12 bolt" is irregular shaped (this is what you have).


I know it sounds crazy but before you go trying to weld the "leak", replace the axle vent, rather put a new hose on there and make sure the fitting on the diff is not plugged. if it has a plastic vent on the end of the hose replace that too. The reason is I have read many times on here that a leak at the tube weld is caused by the air expansion inside the diff when the vent is plugged, the pressure builds inside and forces a leak through a tiny void in a tube weld. Cheap easy thing to check first anyway.
__________________
Dan <---(my name)



67 SWB C10 project "GEORGIA"-59 Brookwood 2dr wag...Next project-03 Tahoe 4x4 5.3 family ride-07 Hondur Accord, commuter car
67c10rustbuket is offline   Reply With Quote
Old 02-19-2014, 10:50 AM   #5
GASoline71
"I ain't nobody, dork."
 
GASoline71's Avatar
 
Join Date: Sep 2007
Location: Whidbey Island, Washington
Posts: 8,922
Re: Axle Leak How to Fix

I agree that it is probably the vent. Possibly overfilled? Is there a hose on the vent nipple.

There were some 12-bolt BOP (Buick Olds Pontiac) axles that had 12 bolt carriers with a 10 bolt cover. So it is correct that it is actually the number of bolts holding the ring gear on, and not the number of cover bolts. However... 95% of them match the bolt count for the cover. The BOP axles described above are a pretty rare find these days.

Gary
__________________
'cuz chicks dig scars...

My 1972 GMC 1500 Super Custom (Creeping Death) "long term" build thread.

The Rebuild of Creeping Death after the wreck

Quote:
Originally Posted by LONGHAIR View Post
I would never rebuild a 305.
Quote:
Originally Posted by prostreetC-10 View Post
I love using vacuum gauges as part of the carb tuning process. I hook the gauge to the inside of my garbage can and leave it there.
Quote:
Originally Posted by Marv D View Post
Remember Murphys 2nd law of mechanical relationships... "OPPOSING COMPONENTS ATTEMPTING TO OCCUPY THE SAME SPACE, AT THE SAME TIME, GENERALLY END UP OCCUPYING ADJOINING SPACE AT THE BOTTOM OF THE OIL PAN"
Quote:
Originally Posted by cableguy0 View Post
Its cheaper to listen to advice given when you ask for help than it is to ignore everyone and wait for carnage.
GASoline71 is online now   Reply With Quote
Old 02-19-2014, 11:33 AM   #6
72chevylwbmo
Registered User
 
Join Date: Jul 2013
Location: Springfield MO
Posts: 66
Re: Axle Leak How to Fix

Thanks for the info guys, I will look into the axle vent and replace it, watch and see if my leak goes away.
72chevylwbmo is offline   Reply With Quote
Old 02-19-2014, 11:45 AM   #7
Lee H
Registered User
 
Lee H's Avatar
 
Join Date: Jun 2010
Location: Upland Ca
Posts: 4,141
Re: Axle Leak How to Fix

How much is it leaking? Just a little dampness or puddle on the garage floor?
__________________
1972 C10 SWB, Air, PS, PB, 350/350THM. Second owner.

1965 Corvette roadster, 44K miles, 327/365 SHP, 4 speed, side exhaust, knockoffs, teak, second owner (bought in 1970), Have ALL numbers matching components.

My frame off restoration thread: http://67-72chevytrucks.com/vboard/s...d.php?t=556703
Lee H is offline   Reply With Quote
Old 02-19-2014, 11:57 AM   #8
72chevylwbmo
Registered User
 
Join Date: Jul 2013
Location: Springfield MO
Posts: 66
Re: Axle Leak How to Fix

It is more than just dampness but I don't have anything on the floor yet. It isn't severe at this point.
72chevylwbmo is offline   Reply With Quote
Reply

Bookmarks


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 07:16 PM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com