View Full Version : Auto Locking differential
I think my Trailblazer doesn't have an auto locking dif. I think that because I remember it almost got stuck once when I was 4 wheeling and the left rear tire was not on the ground.
My question is, does anyone know if it would cost a lot to switch to an auto locking dif. I'm guessing I would have to replace the gears.
I'm going to check with my dealer tomorrow just to get an idea on what it would cost.
Envoy Fan
02-22-2005, 11:04 AM
Look inside your glove box. There is a label on the glove box. If one of the codes is G80 you have a locking diff. If no code, no lockee.
Click on this link for more G80 info
http://www.automotive.eaton.com/product/traction_stability/lockingdiff.html
04TBEXT
02-22-2005, 11:16 AM
Envoy Fan is right - G80 designates locking differential. the "G" codes also signify gear ratios (GU6 = 3.42, GT4 = 3.73 & GT5 = 4.10). If you want to convert a "non-locker" to a "locker", the minimum required would be a locking differential assembly, set of side bearings, lubricants & cover gasket. Specific needs would be determined when disassembled. The I-6 uses an 8.0" ring gear & the V-8 uses an 8.6 " ring gear. The factory uses a combination limited slip clutch set-up and a fly-weighted governer set-up. Could be somewhat costly if purchased as new OEM. If you decide to move forward on this you may want to consider the aftermarket for limited slip differential assemblies. I used an aftermaket differential on an high horsepower muscle car which proved itself to be bulletproof. Good Luck
Thanks for the info. I don't have G80 just as I suspected. If it costs too much, I'll live without it. The 4WD can get me through 99% of the terrain. I found out I do have 3.42 gears though, which seems right because I get around 19mpg with the V-8 at 75mph.
The Chevy dealer couldn't help me so I went to a 4 x 4 parts place. They said it will be around $450 for parts and another $300 to install. I might look into it again later.
02EnvoySLE Guy
02-23-2005, 06:05 PM
My '02 has GT5 and G80 both on the sheet. Meaning (which I believe) I have 4.10's and a Locker :D
I get ~14 MPG city, 16 MPG highway during the winter. But it always increases 1-2 MPG in the summer so I'll be seeing 16-18