Rear Differential Vent Replacement - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum

Welcome Enthusiast! If you already own a Chevy TrailBlazer or GMC Envoy or perhaps thinking of purchasing such a vehicle, then you have come to the best TrailBlazer and Envoy site on the net! Rainier, Bravada, Ascender, and 9-7x owners welcome too!

You are currently viewing our site as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to search and post topics, communicate privately with other members, respond to polls, upload content, and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!

If you have any problems with the registration process or your account login, please contact contact us.
Join Today!
Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 5.3L V8 Engine and Drivetrain > 4x4 Drivetrain

4x4 Drivetrain 4x4 Repairs & Problems is the premier GMC Envoy Forum on the internet. Registered Users do not see the above ads.
Thread Tools
Old 09-17-2018, 12:38 PM
dkdj5 dkdj5 is offline
Junior Member
Join Date: Sep 2018
Posts: 7
Rear Differential Vent Replacement

My rear differential needed all the bearings replace and the cheapest place I could find to do it was $600. I found a used one for $100 and paid a small shop mechanic $200 to change it. I know I was taking a chance, but it worked fine.
I was not at my shop and didn't want to do it on the ground, though you could without too much trouble at home.

I should have dealt with it before putting axle in, but it was already apart in the shop when the tech showed me the rusted off vent nipple. I didn't think it should be too hard to change later, but was I wrong.

After much effort and triall and error, I came up with a plan that made it about a 5
minute job once you have the tools. I made a puller for my first attempt that didn't work to grab the nipple like clam shells. Possibly because it wasn't hardened.

What worked well was, I put grease in the hole first, so as not to get shavings in diff. Then I used a 1/4" self tapping bolt and holding the nipple from turning with small locking pliers, I theaded the bolt in about 3/8' to 1/2".
You may be able to thread it first and put in a regular bolt, but the part in the housing is not very thick and I didn't want to push any shavings inside.
Also self taping bolts tend to be harder/stronger. I used one with regular 1/4-20 treads, not sheet metal or lag threads.
If your nipple is still on, your could try to thread in the top or cut it off if you have problems. The straighter the surface, the easier to thread in the bolt.

Then I made an adapter to fit the bolt head and my original puller.
It came right out.

Simple find a deep socket that fits over the new nipple and drive it in.

The part number for the nipple is 26062696.
My axle is a 7.6, so I don't know if the others are similar or not.
2005 SLT Auto 4.2 GU6
Attached Thumbnails
Click image for larger version

Name:	Vent Removed 1.jpg‎
Views:	3
Size:	430.2 KB
ID:	37557   Click image for larger version

Name:	Puller 1.jpg‎
Views:	2
Size:	454.4 KB
ID:	37559   Click image for larger version

Name:	Puller 2.jpg‎
Views:	3
Size:	449.8 KB
ID:	37561  
Reply With Quote Quick reply to this message
Sponsored Links

Quick Reply

Register Now

In order to be able to post messages on the Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum forums, you must first register.

Please enter your desired user name, your email address and other required details in the form below.
(Only letters, numbers, dashes and underscores are permitted for user names)
The user name that you choose is permanent and can never be changed.
User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Where you live (ex: Philadephia, PA)
Vehicle Year
Choose your year
Or enter your choice here:
Vehicle Color
Choose your factory color (Custom, Not Listed & Two-Tones; Use Text Field Below)
Or enter your choice here:
Vehicle Make
Choose your make
Or enter your choice here:
Vehicle Model
Choose your model
Or enter your choice here:
Vehicle Engine
Choose your engine
Vehicle Drivetrain
Choose your vehicle drivetrain
Security Question
Fill in the blanks: Tra___oy
Please select your insurance company (Optional)


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools

Posting Rules
You may post new threads
You may 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

» Sponsors

Advertising Info

All times are GMT -4. The time now is 09:31 AM.

Chevy TrailBlazer and GMC Envoy Enthusiasts - Copyright 2004 - 2009 All Rights Reserved.
All trademarks referenced herein are property of their respective owners.
RSS Feed