Rear end leak - SmokinVette.com Forums
 
LinkBack Thread Tools Search this Thread Display Modes
post #1 of 5 (permalink) Old 11-03-2012, 06:47 PM Thread Starter
Smokin 50HP Club
 
minkus316's Avatar
 
Join Date: Oct 2010
Location: Olathe, KS (SW KC metro area)
Posts: 96
Rear end leak

I've got a '75 4 speed with (as far as I know) a stock rear end. I see a leak that has the majority of the underside of the pumpkin wet. I'm not sure if the previous owner had the rear end apart or not, but he mentioned replacing the drive lines, so I'm thinking he may have done a diff rebuild kit. The seal between the 2 diff casing half's appears to be a red form-a-gasket material. Wet up to the fill hole and worse on the fill hole side.

Questions:
1) What are the easy things to check first?
2) The red fluid tag spins loosely. Is this normal?
3a) If you were tearing the rear differential apart what would you replace if all parts are original
3b) If you were tearing the rear differential apart what would you replace if all parts were replaced 10 years ago?
minkus316 is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 11-03-2012, 07:18 PM Thread Starter
Smokin 50HP Club
 
minkus316's Avatar
 
Join Date: Oct 2010
Location: Olathe, KS (SW KC metro area)
Posts: 96
Uploading pictures didn't work for me for some reason, but here are links to a few.

Bottom, passenger and driver sides views...

https://docs.google.com/open?id=0B9o...i1ZVDVxMS1QUmM


https://docs.google.com/open?id=0B9o...HEwNzdMQjF3bFE



https://docs.google.com/open?id=0B9o...HBGeWltZUEteGs
minkus316 is offline  
post #3 of 5 (permalink) Old 11-04-2012, 01:23 AM
Smokin 5000HP+ Posting Maniac
 
Join Date: Feb 2009
Location: Saudi Arabia
Posts: 9,529
Quote:
Originally Posted by minkus316 View Post
I've got a '75 4 speed with (as far as I know) a stock rear end. I see a leak that has the majority of the underside of the pumpkin wet. I'm not sure if the previous owner had the rear end apart or not, but he mentioned replacing the drive lines, so I'm thinking he may have done a diff rebuild kit. The seal between the 2 diff casing half's appears to be a red form-a-gasket material. Wet up to the fill hole and worse on the fill hole side.

Questions:
1) What are the easy things to check first?
2) The red fluid tag spins loosely. Is this normal?
3a) If you were tearing the rear differential apart what would you replace if all parts are original
3b) If you were tearing the rear differential apart what would you replace if all parts were replaced 10 years ago?

Not all RTV's (silicon) are compatible with oil and I would guess the previous owner used a wrong kind between the rear cover and the differential housing. All of the Permatex "Ultra" silicon is compatible with oil. I usually use Ultra Black for oil jobs.

The most common point of wear is the ends of the side yokes where they bear against the spider gear shaft. The factory yokes were pretty soft and easily mushroomed. But the new yokes are much harder and will last a lot longer.
toobroketoretire is offline  
post #4 of 5 (permalink) Old 11-05-2012, 02:25 PM Thread Starter
Smokin 50HP Club
 
minkus316's Avatar
 
Join Date: Oct 2010
Location: Olathe, KS (SW KC metro area)
Posts: 96
Any other thoughts?
minkus316 is offline  
post #5 of 5 (permalink) Old 11-06-2012, 11:40 AM
Smokin 50HP Club
 
Join Date: Jul 2008
Location: north tonawanda, new york
Posts: 89
From the looks of the second picture, your problem may just be a leak at the fill plug, and as you drive the oil migrates around the rearend. Hope that's all it is.
Duane
duane4238 is offline  
Sponsored Links
Advertisement
 
Reply

Share This Thread

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the SmokinVette.com Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode



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
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome