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2007 chevy trailblazer_ls
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Discussion Starter · #1 ·
Okay, I think the question is self-explanatory...

It's a (very) base 4x4 model 07 TrailBlazer LS, with no options as far as I can tell...(not even power seats!). Just the way I like it, not much to break :D I was suprised my wifey would let me buy it that way...

We bought it because it still had factory warranty left, and it is a GM Certified used vehicle...turns out it was a repo from another state on the Carfax report.

I had no idea there were mutliple axle ratios available until I read the towing section in the owner's manual...how do I figure out which one ours has? I tried the stickers on the door pillars-no dice :worried:
 

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2004 chevy trailblazer_ls
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1,574 Posts
There is a sticker when you open your glove box. It's on the inside of the door.
I believe these are the codes. Just look for one of these in the lists of codes.
GU6- 3.42
GT4- 3.73
GT5-4.10
G80- locking rear diff
 

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2009 chevy
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6,431 Posts
Well, you need to use the sticker on the glove box.

Then, search the site for the threads that discuss axle ratios (a lot of them).

There are 3 axles (I don't remember the RPO codes), when you find the 3 codes, one will match the axle in your truck.

BTW, we also have 2 differentials available.

EDIT: Craig got there first, but using the search function will turn up a lot of interesting info.
 

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2007 chevy trailblazer_ls
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Discussion Starter · #4 ·
GU6- 3.42
GT4- 3.73
GT5-4.10
G80- locking rear diff

Drat! It's GU6...:mad:

Was hoping I could rent a U-Haul car hauler to get a full-size classic pickup (~3400 lbs) back up here from Texas, but looks like it ain't happenin' ,as 5,400 lbs is more than 5,200 lbs...(U-Haul's website says the empty weight of the car hauler is 2000 lbs).

At least the wife will get the best possible mileage hauling groceries and our kid around :)
 

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2007 chevy trailblazer_ls
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Discussion Starter · #5 ·
BTW, we also have 2 differentials available.
As far as I can tell, a limited slip differential (rear only on the TrailBlazer?) is mostly useful for offroading? Or does it also give one benefits in towing?
 

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2003 gmc envoy_slt
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7,190 Posts
The G80 can be more helpful than the 4 wheel drive at times. With 4 wheel drive there are times when all the traction can be on one wheel. With the G80 locking differential you will have at least two wheels driving.:m2:
 

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2009 chevy
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As far as I can tell, a limited slip differential (rear only on the TrailBlazer?) is mostly useful for offroading? Or does it also give one benefits in towing?
It's actually a "locker", rather than a posi type diff. Same end result, but different mechanics.

The G80 can be more helpful than the 4 wheel drive at times. With 4 wheel drive there are times when all the traction can be on one wheel. With the G80 locking differential you will have at least two wheels driving.:m2:
At times.

When you use a G80 (or any diff that prevents slippage between the axles), you need to be very careful that you don't lose lateral stability and slip sideways.
When on a side hill, and both rear wheels spin, the result is complete lose of traction (friction) and gravity will pull the truck sideways down the hill. With a non-locking (open diff), one wheel will spin (no traction/friction), but the other will maintain friction and keep the vehicle on the side hill.

In the 1st scenario, the G80 gives us 3 wheels (one front and two rear) with drive torque, but we fall sideways (this is how roadie damaged the rear drive-shaft) and get very stuck.

In the 2nd scenario, we have only 2 wheels (one front and one rear) and we probably get out because we don't fall sideways.

I have a G80, and only buy trucks with a posi, or a locker, but they can be very dangerous on ice and in 2wd. Learn how to drive them. Be careful out there.
 

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2003 chevy trailblazer_ltz
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I have a G80, and only buy trucks with a posi, or a locker, but they can be very dangerous on ice and in 2wd. Learn how to drive them. Be careful out there.
^^^ I am recalling a few times this past winter when I had the poo scared outta me.....
 

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So the g80 is a 3.73 with a locking diff?. i just found my window sticker and it says locking diff, 3.73 gears and in my glove box i see a g80 code
 

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2004 gmc
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26,181 Posts
So the g80 is a 3.73 with a locking diff?.
Nope. G80 is the locking diff. Good to have. The three gear ratio choices are separate from the presence or absence of the G80. Run a search here to find the often-posted chart, or become familiar with all of your RPO codes by checking the list under the "Resources" pull-down menu.
 

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2003 gmc envoy_slt
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7 Posts
Have to do my rear axle seals on a 2003 Envoy SLT. I could not find my build sheet so I called the dealer and told them what I had and they asked for the last 8 digits of the vin #87654321 . The agent told me that I have a G80 / posi-limmited slip diff in it. Just to make sure I called another one to verify and it was correct. $13.94 each.

Good guys here ....
Jason was very , very helpful.
Mike Juneau's Brookfield Buick GMC
13000 W Capitol Dr
Brookfield, WI 53005
(888) 869-4785
 

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2007 chevy trailblazer_lt
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7 Posts
There was alot to read in there and im looking for 1 simple answer. My 07 TBLT has stabilitrak and both differentials lock in 4low. For bein such a pretty car, it can drive easily axle deep in my back yard.(that was an accident). Can anyone tell me what axles i have?
 

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2006 gmc envoy_slt
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i have 2 salvage yard axles and need to know how to check the front diff gear ratio after its already installed. i believe i have to different gear ratios due to binding in 4x4 didnt have that problem prior to the diff installs.
 
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