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axle ratio

15K views 18 replies 14 participants last post by  Long 
#1 ·
The rpo code list for my car has a G80 DIFFERENTIAL, LIMITED SLIP and GU5 AXEL REAR, 3.23 RATIO. Does this mean there are other ratios for the cts or 3.23 is for all?
 
#5 ·
Hi to all
let me throw in, what I have seen in writing.
I got two build sheets, 2011 CTS 3.6DI 6sp-AT Wagon RWD and 2011 CTS 3.6DI 6sp-AT Coupe, RWD
Both had RPO G80 for Limited Slip Positraction.
The Coupe lists RPO GT4 for 3.73 rear ratio
The Wagon lists RPO GU6 for 3.42 rear ratio

pinkguy
 
#6 ·
I have been researching this. Appears to be a 3.23, 3.42 and 3.73. My CTS performance 3.6L has the 3.42. Below is from my build sheet. I believe the GT4 is the 3.73. I am looking to get a used 3.73 off ebay and replace my 3.42. Anyone do this? Drop in replacement? Then I'll have to work on updating the speedo.
GU6 AXLE,REAR,3.42 RATIO 3.42R(GU6)
G80 AXLE,REAR,POSITRACTION,LIMITED SLIP POSITRACTION L/SLIP R/AXL(G80)
 
#7 ·
KensCTS said:
I have been researching this. Appears to be a 3.23, 3.42 and 3.73. My CTS performance 3.6L has the 3.42. Below is from my build sheet. I believe the GT4 is the 3.73. I am looking to get a used 3.73 off ebay and replace my 3.42. Anyone do this? Drop in replacement? Then I'll have to work on updating the speedo. GU6 AXLE,REAR,3.42 RATIO 3.42R(GU6) G80 AXLE,REAR,POSITRACTION,LIMITED SLIP POSITRACTION L/SLIP R/AXL(G80)
chances are it will throw off your abs and traction control systems.
 
#8 ·
I doubt that would happen. I changed out my 2.73 diff with a 3.42 in my '99 Vette and no problems with abs or traction control or anything else. The PCM reads speed at the wheels and while it can be somewhat sensitive to tire diameter it doesn't seem to care what the final drive ratio is.

Bill
 
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