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Username Post: G80 gear ratio upgrade swap        (Topic#359280)
slo 
Frequent Contributor
Posts: 2199

Age: 36
Loc: Houston Tx and Sydney Aus...
Reg: 03-16-08
12-29-19 03:32 AM - Post#2783115    

So i had a what appears to be carrier bearing fail on my 2006 1500. With a g80 eaton with 2.23 ratio. What would be an adequate swap in this family of diff. Not trying to over improve. Just want to stay within whats interchangeable.

Truck runs drums in the back and unless necessary dont plan on changing the housing. Unless its compromised. Theres is 2.73 and 4.10 and other but i dont plan on changing the stockish wheels and dont want to throw off the speedometer too much if any.

Any recommendations on this. Or has anyone done anything like that. I dont dogg my vehicle’s out either so was surprised when this happened.

1964 Impala SS
1964 Impala station wagon
1953 chevy 210
2005 Silverado


 
someotherguy 
Senior Moderator
Posts: 29054
someotherguy
Age: 49
Loc: Texas
Reg: 08-01-03
12-29-19 05:13 AM - Post#2783117    
    In response to slo

Hey Joe,

2.23, typo maybe you meant 3.23? Any change is gonna have your speedometer and odometer wrong.

I'm no differential expert but everything I've read about the 8.6 rear says that 2.73 and up use the same carrier so you shouldn't need to worry about changing that. 3.73's would wake it up a bit without hurting mileage, IMO.

Be sure to use plain 80W90 GL-5 spec'd lube, no posi additive, on that G80 unit.

Richard

06 Silverado ISS / 06 Silverado SS / 06 300C SRT8


 
junkman104 
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Posts: 1469
junkman104
Age: 60
Loc: Murphy N.C.
Reg: 01-25-14
12-29-19 05:22 AM - Post#2783118    
    In response to slo

My 04 Z71 carrier bearings failed about 5 years ago. I replaced them myself but you should be able to find someone in your area to do it for you if you can't. I am assuming yours is a 3.23 not a 2.23.



 
slo 
Frequent Contributor
Posts: 2199

Age: 36
Loc: Houston Tx and Sydney Aus...
Reg: 03-16-08
12-29-19 10:05 AM - Post#2783124    
    In response to someotherguy

Richard

Thats right 3.23. I think these are the smallest of the bunch anyway and cant find any other than 879.00 dealer ones.

Exact replace is ideal but if i find say a reasons replacement id be on it. While the diff its self doesnt seem bad it might have shavings and crap all in it that may warrant the full replace anyway. Pinion and all that got banged around with bearings snd teeth grinding.

1964 Impala SS
1964 Impala station wagon
1953 chevy 210
2005 Silverado


 
slo 
Frequent Contributor
Posts: 2199

Age: 36
Loc: Houston Tx and Sydney Aus...
Reg: 03-16-08
12-29-19 10:08 AM - Post#2783125    
    In response to junkman104

  • junkman104 Said:
My 04 Z71 carrier bearings failed about 5 years ago. I replaced them myself but you should be able to find someone in your area to do it for you if you can't. I am assuming yours is a 3.23 not a 2.23.



Wonder how bad yours were. Mines slowly started tapping. Then just gave out on the freeway and way able to roll off to a stop. Enough for plenty of teeth to get chinked up.

1964 Impala SS
1964 Impala station wagon
1953 chevy 210
2005 Silverado


 
junkman104 
Frequent Contributor
Posts: 1469
junkman104
Age: 60
Loc: Murphy N.C.
Reg: 01-25-14
12-29-19 05:58 PM - Post#2783166    
    In response to slo

They chunked out on the races bad enough for my wife to say "whats that noise?" I rebuilt it soon after.



 
slo 
Frequent Contributor
Posts: 2199

Age: 36
Loc: Houston Tx and Sydney Aus...
Reg: 03-16-08
12-29-19 10:59 PM - Post#2783187    
    In response to junkman104

Yeah. Needless to say mine turned into a rattling from hell until it just spun freely. Which is probably as bad as it gets. Just hope the axel case is not compromised.

1964 Impala SS
1964 Impala station wagon
1953 chevy 210
2005 Silverado


 
junkman104 
Frequent Contributor
Posts: 1469
junkman104
Age: 60
Loc: Murphy N.C.
Reg: 01-25-14
12-30-19 05:20 AM - Post#2783198    
    In response to slo

Try this website for a used one in your area if you don't already know about it. http://car-part.com/



 
slo 
Frequent Contributor
Posts: 2199

Age: 36
Loc: Houston Tx and Sydney Aus...
Reg: 03-16-08
01-07-20 02:06 AM - Post#2783895    
    In response to junkman104

will do


1964 Impala SS
1964 Impala station wagon
1953 chevy 210
2005 Silverado


 
elcamino 
Dedicated Member
Posts: 5426
elcamino
Loc: Lake Superior-Michigan US...
Reg: 03-30-00
01-12-20 05:57 AM - Post#2784233    
    In response to slo

The G80 Locking rear differential has nothing to do with the ring and pinion (ratio). Its available in all.

Be advised that if its a 4 wheel drive you can't just change the rear ratio. They must match up, you can't have the front and rear running at different speeds (in 4wd).

Mike
2017 GMC Sierra Denali Ultimate 6.2L / 8-sp Z95
2017 John Deere X738 Snow Blower
2018 Polaris RZR S 900 EPS


 
Smitty_Chevy 
Frequent Contributor
Posts: 1122
Smitty_Chevy
Age: 70
Loc: Hampton, GA
Reg: 10-29-08
01-25-20 08:24 PM - Post#2785182    
    In response to slo

  • slo Said:
i dont plan on changing the stockish wheels and dont want to throw off the speedometer too much if any.




If you change gear ratios or wheel diameters you can re calibrate your speedo with a computer programer.

I was looking for a programmer several years ago for my 2003 Silverado and found two of them in one lot for sale pretty cheap on Ebay. One is a Jet Programmer and the other was made by Crane Cams.

You can also do a lot of other stuff with the programmers besides just calibrating you speedometer. You can retard or advance timing, change transmission shifting from soft to firm, change transmission RPM shifting points, change temperatures when the cooling fan kicks on, to name just a few that I remember.

If you buy a used programmer you just have to make sure that the seller has cleared his vehicle vin number from the programmer otherwise they are VIN locked. Both of mine were cleared and worked fine.


The tree of liberty must be refreshed from time to time by the blood of patriots and tyrants - Thomas Jefferson


 
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