C5 Tech Corvette Tech/Performance: LS1 Corvette Technical Info, Internal Engine, External Engine, Tech Topics, Basic Tech, Maintenance, How to Remove & Replace
Sponsored by:
Sponsored by:

Differential fill and drain, what size socket??

Thread Tools
 
Search this Thread
 
Old Nov 20, 2005 | 02:44 PM
  #1  
David426's Avatar
David426
Thread Starter
Safety Car
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2004
Posts: 4,816
Likes: 132
From: Plano TX
Default Differential fill and drain, what size socket??

I am going to change my diff fluid I saw a fill plug on top which looked like it takes a hex socket. What size is this socket and is it the same for the drain plug?? Thanks
Reply
Old Nov 20, 2005 | 02:50 PM
  #2  
coast7's Avatar
coast7
Racer
 
Joined: Dec 2004
Posts: 405
Likes: 0
From: Virginia Beach Virginia
Default

Originally Posted by David426
I am going to change my diff fluid I saw a fill plug on top which looked like it takes a hex socket. What size is this socket and is it the same for the drain plug?? Thanks
I bought a 3/8" allen head socket from Sears to do the job.
Reply
Old Nov 20, 2005 | 04:31 PM
  #3  
rws.1's Avatar
rws.1
Race Director
20 Year Member
Conversation Starter
All Eyes On Me
 
Joined: Jul 2004
Posts: 16,795
Likes: 62
From: Lake Havasu City, AZ
Default

I agree 3/8" hex key both fill and drain
Reply
Old Nov 20, 2005 | 04:36 PM
  #4  
screw991le's Avatar
screw991le
Race Director
10 Year Member
 
Joined: Sep 2004
Posts: 17,786
Likes: 4
From: Redsox, Pats, Celts & Bruins !!! Redsox Nation !!!
St. Jude Donor '06-'07-'08-'09-'10-'11-'12
Default

Or just use your 3/8" socket extension.
Reply
Old Nov 20, 2005 | 05:35 PM
  #5  
David426's Avatar
David426
Thread Starter
Safety Car
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2004
Posts: 4,816
Likes: 132
From: Plano TX
Default

Damn Screw99. I just bought a 3/8" hex end socket at Pep Boys. Did not even use my common sense on using the 3/8 extention. Dope... Oh well it was only 3.99
Reply
Old Nov 20, 2005 | 07:05 PM
  #6  
screw991le's Avatar
screw991le
Race Director
10 Year Member
 
Joined: Sep 2004
Posts: 17,786
Likes: 4
From: Redsox, Pats, Celts & Bruins !!! Redsox Nation !!!
St. Jude Donor '06-'07-'08-'09-'10-'11-'12
Default

Originally Posted by David426
Damn Screw99. I just bought a 3/8" hex end socket at Pep Boys. Did not even use my common sense on using the 3/8 extention. Dope... Oh well it was only 3.99

Sorry
Reply
Old Nov 20, 2005 | 09:09 PM
  #7  
coast7's Avatar
coast7
Racer
 
Joined: Dec 2004
Posts: 405
Likes: 0
From: Virginia Beach Virginia
Default David426 - This may be important!

Originally Posted by David426
I am going to change my diff fluid I saw a fill plug on top which looked like it takes a hex socket. What size is this socket and is it the same for the drain plug?? Thanks
The differential case's fill and drain plugs are not HEX, they are square and the end of a 3/8" ratchet extension will work fine.

The transmission, which is located directly in front of and attached to the differential case, has drain and fill plugs also. They are 3/8" hex/allen heads.

If you are removing the plug that has a hex head you will be draining the transmission fluid. Check your owner's manual, there is a diagram and instructions for changing the differential fluid.

Not to insult anyone's intelligence, remember that these units are separate and use VERY different fluids.

Hope this helps
Reply
Old Nov 20, 2005 | 09:41 PM
  #8  
coast7's Avatar
coast7
Racer
 
Joined: Dec 2004
Posts: 405
Likes: 0
From: Virginia Beach Virginia
Default

Originally Posted by David426
Damn Screw99. I just bought a 3/8" hex end socket at Pep Boys. Did not even use my common sense on using the 3/8 extention. Dope... Oh well it was only 3.99
David426,

On my '98, the 3/8" hex/allen head is for the differential plugs. The transmission plugs have square heads that a 3/8" extension will fit nicely.

So, if you are removing a plug with a square head, you may be draining the transmission and not the differential.

Hope this helps
Reply
Corvette Stories

The Best of Corvette for Corvette Enthusiasts

story-0

10 Ugly Corvettes That We Still Kinda Love

 Joe Kucinski
story-1

Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

 Brett Foote
story-2

10 Things Every Corvette Owner Needs (2026 Edition)

 Michael S. Palmer
story-3

8 Most "Only Corvette Owners Understand" Quirks and Problems

 Pouria Savadkouei
story-4

10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

 Joe Kucinski
story-5

How Much Horsepower Every Corvette Engine "LOST" in 1972

 Joe Kucinski
story-6

Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

 Michael S. Palmer
story-7

Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

 Joe Kucinski
story-8

150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

 Joe Kucinski
story-9

8 Coolest Corvette Pace Cars (and Replicas) of All Time

 Verdad Gallardo
Old Nov 20, 2005 | 09:43 PM
  #9  
Lovin It!!! - C5's Avatar
Lovin It!!! - C5
Racer
Supporting Lifetime
 
Joined: Oct 2005
Posts: 351
Likes: 0
From: Haw River North Carolina
Default

Originally Posted by coast7
David426,

On my '98, the 3/8" hex/allen head is for the differential plugs. The transmission plugs have square heads that a 3/8" extension will fit nicely.

So, if you are removing a plug with a square head, you may be draining the transmission and not the differential.

Hope this helps

Just did both myself.
Reply
Old Nov 21, 2005 | 08:44 PM
  #10  
David426's Avatar
David426
Thread Starter
Safety Car
20 Year Member
Liked
Loved
Community Favorite
 
Joined: Oct 2004
Posts: 4,816
Likes: 132
From: Plano TX
Default

Thank you guys for all the info
Reply

Get notified of new replies

To Differential fill and drain, what size socket??





All times are GMT -4. The time now is 07:00 AM.

story-0
10 Ugly Corvettes That We Still Kinda Love

Slideshow: 10 ugly Corvettes that we still kinda love.

By Joe Kucinski | 2026-06-03 10:34:17


VIEW MORE
story-1
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer

A lot of money has changed hands at the online auction house over the years.

By Brett Foote | 2026-06-03 10:21:50


VIEW MORE
story-2
10 Things Every Corvette Owner Needs (2026 Edition)

Slideshow: 10 great gifts Corvette enthusiasts actually want for Father's Day!

By Michael S. Palmer | 2026-06-03 15:43:40


VIEW MORE
story-3
8 Most "Only Corvette Owners Understand" Quirks and Problems

Slideshow: These are the quirks, annoyances, and oddly lovable problems that every Corvette owner eventually learns to live with.

By Pouria Savadkouei | 2026-05-28 09:31:39


VIEW MORE
story-4
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years

Slideshow: 10 reasons why the C6 Z06 is still a performance benchmark after 20 years.

By Joe Kucinski | 2026-05-27 17:20:09


VIEW MORE
story-5
How Much Horsepower Every Corvette Engine "LOST" in 1972

Slideshow: How much horsepower every Corvette engine lost in 1972.

By Joe Kucinski | 2026-05-27 16:54:53


VIEW MORE
story-6
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!

Slideshow: How to Protect A Convertible Top: 10 DOs & DON'Ts

By Michael S. Palmer | 2026-04-03 00:00:00


VIEW MORE
story-7
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!

Slideshow: The 10 most explosive Corvettes ever built based on power-to-weight ratio.

By Joe Kucinski | 2026-05-20 07:23:03


VIEW MORE
story-8
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter

Slideshow: From C1 to C8 we compare every Corvette generation by the numbers.

By Joe Kucinski | 2026-05-12 16:54:12


VIEW MORE
story-9
8 Coolest Corvette Pace Cars (and Replicas) of All Time

Slideshow: Some Corvette pace cars became collectible legends, while others perfectly captured the look and attitude of their era.

By Verdad Gallardo | 2026-05-11 09:50:51


VIEW MORE