Go Back   Chevrolet Forum - Chevy Enthusiasts Forums > Current Chevy Trucks, SUV's, Crossovers & Vans > Silverado & Fullsize Pick-ups
Sign in using an external account
Register Forgot Password?
Search

Silverado & Fullsize Pick-ups The Silverado has been one of the best selling trucks in the US for decades, and is truly proven to be "like a rock".

2014 Chevy Silverado
Platform: Truck, GMT 400, 800, & 900
Sponsored by: Bakliner

Reply
 
 
 
 
LinkBack Thread Tools
  #1  
Old 12-10-2010, 11:02 PM
CF Beginner
 
Join Date: Dec 2010
Posts: 19
Default Locking diff?

My new (to me) 2008 Silverado LS 1500 is supposed to have a locking rear differential. How, if any, is this different from a limited slip differential?

Can somebody tell me how it works? I've driven the truck on slippery and loose gravel roads, and don't notice anything appreciable in the handling, ie: the back wheels still spin when I give it gas. I back off right away, so can't really tell if one or both rear wheels are spinning. (This is in 2-wd, by the way.) How can I tell if it's working?

Oh, and the dealer put in a new rear differential just before I bought the truck, didn't disclose that to me at the time of sale. The salesperson slipped and mentioned it when I requested the service records later. Is there any chance they put in a regular (non-locking) differential when they changed it out?


Thanks,

Geo
Register today for free or log-in if already registered to remove this ad!
Reply With Quote
  #2  
Old 12-11-2010, 01:44 AM
Mille Racer 69's Avatar
CF Senior Member
 
Join Date: Mar 2010
Location: Redding, California
Posts: 547
Default

Well 1 way to tell if it is supposed to have locking differential is open the glove compartment and there
Should be a piece of paper stuck in there with a bunch of RPO codes, see if 1 of those codes reads "G80".
Iirc G80 is the code for a locking differential.
Or you could click the blue link in my sig line to check all your stock features.

To my understanding, you have 1 wheel spinning and when that wheel looses traction the other rear wheel
Starts spinning also. Mud is slippery, regardless if you have it or not you are still gonna slip.
__________________
**CHECK YOUR VEHICLES' STOCK FEATURES WITH A VIN LOOKUP - CLICK HERE**
'95 5.7L Silverado K1500 Z71 Sportside
Quickshift Kit
Airaid Cold Air Intake
Z71 4x4 Off Road Package
Flowmaster 40 series true dual exhaust
Reply With Quote
  #3  
Old 12-11-2010, 08:40 PM
CF Junior Member
 
Join Date: Nov 2010
Posts: 91
Default

Speaking "old school"
Limited slip means that when one wheel spins faster than the other, the mechanism inside the diff tightens up and transfers some power to the other wheel.
Locker or locking diff means that there is a mechanism in the diff that divides the power to both wheels nearly 100% of the time with very little differential between them.
However, modern definitions have been bastardized by the manufacturers.

How a G80 works:
http://www.youtube.com/watch?v=KbMZ9vcYVSg
A G80 "locker" demo video (about 40 seconds in):
http://www.youtube.com/watch?v=q-rQT...eature=related

If it had a true, old school Detroit Locker, there would be no initial single tire spin.
Reply With Quote
  #4  
Old 12-12-2010, 10:06 PM
CF Beginner
 
Join Date: Dec 2010
Posts: 19
Default

The list of option codes for the truck includes a G80-locking rear differential, which would suggest the truck originally had one. The rear diff was changed earlier this year (the dealer can't give me a reason why).

From what I've learned, the G80 locks up when one axle spins 100 RPM faster than the other axle. So putting it up on axle stands and turning the wheels by hand to see which way they go isn't going to tell me anything, unless I can manage to spin the tire at 100 RPM.

Guess my next step will be to find some soft ground (maybe pull the truck over so that one rear wheel is on the gravel and the other is on the pavement, and then try to spin out. wonder if I need to put something in front of the front wheels to hold it back a bit?

Unless somebody else has a surefire test for the G80?
Reply With Quote
  #5  
Old 12-13-2010, 12:08 AM
CF Junior Member
 
Join Date: Nov 2010
Location: East Bay, California
Posts: 73
Send a message via AIM to BayAreaChevyGuy
Default

Are you thinking the jip'ed you out of what your supposed to have? Or just trying to figure out how your system works?
Reply With Quote
  #6  
Old 12-13-2010, 10:24 AM
CF Junior Member
 
Join Date: Nov 2010
Posts: 91
Default

Quote:
Originally Posted by Georooney View Post
Unless somebody else has a surefire test for the G80?
Jack one wheel up until it has no traction.
Now try to drive off the jack.

But take precautions so you do not run over someone or hiy something when the G80 kicks in and moves you forward.
Reply With Quote
  #7  
Old 12-13-2010, 10:33 AM
CF Beginner
 
Join Date: Dec 2010
Posts: 19
Default

Quote:
Originally Posted by DoubleO7 View Post
Jack one wheel up until it has no traction.
Now try to drive off the jack.

But take precautions so you do not run over someone or hiy something when the G80 kicks in and moves you forward.

Ouch!!!
Reply With Quote
  #8  
Old 12-13-2010, 10:39 AM
CF Beginner
 
Join Date: Dec 2010
Posts: 19
Default

Quote:
Originally Posted by BayAreaChevyGuy View Post
Are you thinking the jip'ed you out of what your supposed to have? Or just trying to figure out how your system works?
Not suggesting that they cheaped out and replaced the G80 with a regular diff, although I do wonder at why they didn't disclose that it had been changed. More that I wonder if it's working? The day after I bought the truck it snowed, and the rear wheels of the truck seemed to be breaking away each time I accelerated from a stop. I'll admit I was a bit heavy on the gas, coming from a 4-cylinder 5-speed manual to an 8-cylinder 4-speed automatic.
Reply With Quote
  #9  
Old 12-13-2010, 12:00 PM
gotstylez's Avatar
Super Moderator
1995 Chevrolet Silverado 1500
 
Join Date: Oct 2009
Location: ohio
Posts: 1,636
Default

easiest way is to pull off into some grass..and hit the gas..personaly i dont like the g80 my dads 06 had it everytime he got into some snow with 1 wheel and pavement on the other and gas it he would chirp the other tire when it started to spin.. which is why they call them garande 80's...because they explode on people when doing that
__________________
Davey

"As I lay rubber down the street, I pray for traction I can keep, but if I spin and begin to slide, please dear God protect my ride." -Amen

Quote:
Originally Posted by RacerX View Post
. Yukon doesnt have the same familial feel as "I was in a Jimmy pulling hogs"
Reply With Quote
  #10  
Old 01-02-2011, 03:01 PM
CF Beginner
 
Join Date: Dec 2010
Posts: 19
Default

OK, so here's the latest: the dealer says the 2008 Silverado LS doesn't come with the G80 locking differential, only the newer models 2010 and on. My spec sheet says it does. Who's right, the dealer or General Motors?
Reply With Quote
Old 01-02-2011, 03:01 PM
 
 
 
Reply

Tags
1995, astro, blazer, check, chevrolet, chevy, diff, differential, features, g80, locking, option, rear, silverado, works


Thread Tools

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On


Join Chevroletforum
Advertising

Featured Sponsors
Vendor Directory
Our Sponsors
All times are GMT -5. The time now is 08:09 PM.

Internet Brands, Inc.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO ©2010, Crawlability, Inc.

Emails Backup