2008 Gmc Sierra 1500 Rear Differential Question

[bam2880]

hi i have a 2008 gmc sierra 1500 with the 5.3 vortec motor it is a 4x4 and i dont have a button for the traction control and was wondering what rear differential i have and what were the option for this year

[dlstewart01]

GQ1 -- AXLE REAR, STD RATIO

GT4 -- AXLE REAR, 3.73 RATIO

GT5 -- AXLE REAR, 4.10 RATIO

GU4 -- AXLE REAR, 3.08 RATIO

GU5 -- AXLE REAR, 3.23 RATIO

GU6 -- AXLE REAR, 3.42 RATIO

G80 -- AXLE REAR, Heavy Duty locking differential

 

And that would be an 8.6 10 bolt

[bam2880]

how do i find out what mine is

GQ1 -- AXLE REAR, STD RATIO

GT4 -- AXLE REAR, 3.73 RATIO

GT5 -- AXLE REAR, 4.10 RATIO

GU4 -- AXLE REAR, 3.08 RATIO

GU5 -- AXLE REAR, 3.23 RATIO

GU6 -- AXLE REAR, 3.42 RATIO

G80 -- AXLE REAR, Heavy Duty locking differential

 

And that would be an 8.6 10 bolt

[bam2880]

like where do i find those numbers and is it a locking differential or a limited slip

[timdan94]

look in the glove box. there is a list of rpo codes

[dlstewart01]

like where do i find those numbers and is it a locking differential or a limited slip

 

They are on the white label in your glove box. if it says G80 you have a locking diff. GM does not install limited slips in trucks with the exception of the Quadrasteer which could come with a G86 limited slip.

 

Where the confusion comes in GM uses the same RPO code G80 for the locker that comes in trucks and also for the limited slip that comes in cars.