2008 Avalanche Ltz 6.0l 4.10 Rear End

[Arg]

Just ordered a 08 Avalance LTZ with the 6.0l and 4.10 rear end. I have had a 2007 Tahoe with the 5.3l but was wondering other thoughts on this 6.0l engine. Also please pardon my stupid question but can someone explain the difference between the 3.73 and the 4.10. I know the 4.10 is for heavier loads for the most part but just a quick thoughts on how these rear ends work. Thanks in advance. Arg

[VMax2007]

Can you get a new Avalanche with the 6.0 and 3.73's? When I was shopping the new 2007 Avs back in late 2006, the 6.0's ONLY came with 4.10's.

[GeoHawk]

Can you get a new Avalanche with the 6.0 and 3.73's? When I was shopping the new 2007 Avs back in late 2006, the 6.0's ONLY came with 4.10's.

That's still the case as far as I can tell.

[s-ten]

4.10's are designed to give more power across the power-band and they won't get as good of fuel economy as the 3.73.

 

What is strange is that the 6.0 w/ 4.10 is rated to tow less then the 5.3 w/ 4.10, 300 lbs less in a 4x4. That seems odd to me.

 

That should be a sweet truck though.

[GeoHawk]

...Also please pardon my stupid question but can someone explain the difference between the 3.73 and the 4.10. I know the 4.10 is for heavier loads for the most part but just a quick thoughts on how these rear ends work. Thanks in advance. Arg

Arg,

 

On a rear differential with a 3.73:1 gear ratio, the driveshaft will turn 3.73 times for every rotation of the rear wheels. With a 4.10:1 ratio, the driveshaft will turn 4.10 times for every revolution of the rear wheels. So at any given speed, the vehicle engine with a 4.10 gearset will be running higher rpm's than one with 3.73 gears. Therefore, the vehicle with 4.10 gears will be developing more power at any given speed than one with 3.73 gears, which is why higher gear ratios are recommended if you will be doing lots of towing. The downside to this is that, generally, with the higher gears the engine will be turning more rpm's and using more fuel. Fuel consumption is less of a factor with GM's V-8s with Active Fuel Management, where half the cylinders shut down in low load situations. Some people with the 6.0L and 4.10s actually are getting better mileage than the 5.3L with 3.73s. The engine can run in V-4 mode more as the combination of the 6.0s power advantage and the higher rpm's allow the engine to generate enough power in V-4 mode that it doesn't have to drop back into V-8 as much while cruising.

[Daniel T]

and in the 3/4 ton Burb with the 6.0L you can only get 3:43s...

 

If you can get the 4:10s in the 1/2 ton Avalanche, why doesn't GM offer the same 4:10s in the 1/2 ton Silvy with 2WD?

In the Avalanche you can get the 4:10s in the 2 and 4WD.

 

If you look at the transmission gearing...the 4L70E that comes with the 6.0L has a higher 4 gear ratio than the 4L60E that comes with the 5.3L. .63 vs .70 for 4th gear. 1-3 gear ratios are the same for both trannys.

[s-ten]

If you look at the transmission gearing...the 4L70E that comes with the 6.0L has a higher 4 gear ratio than the 4L60E that comes with the 5.3L. .63 vs .70 for 4th gear. 1-3 gear ratios are the same for both trannys.

 

I did notice that, and that may be what contributes to the slightly lower towing capabilities of the 6.0.

[C & A s Dad]

4.10's are designed to give more power across the power-band and they won't get as good of fuel economy as the 3.73.

 

What is strange is that the 6.0 w/ 4.10 is rated to tow less then the 5.3 w/ 4.10, 300 lbs less in a 4x4. That seems odd to me.

 

That should be a sweet truck though.

 

 

I would not be quite so quick to say the 3.73 will offer better MPG than the 4.10s especially when AFM is in place. If you are driving mostly city or rural roads under 65 MPG, it would be my opinion that the 4.10s will do better than the 3.73s. However, if you spend a good bit of time upwards of 70, the 3.73s will offer better MPG if the truck is not equipped with AFM.

[ws6_guy]

Geohawk gave the very best description. I also think that on highway the 4.10s would do better, at a speed of 60 I can still stay under 2000rpms, not sure about a 3.73 but I would imagine the smaller gearing would make higher rpms on highway speeds, the 3.73s would do better in city though

[Arg]

Thanks for all the help guys. I am excited to get this in next week. I will post pics as soon as I can.

[s-ten]

Geohawk gave the very best description. I also think that on highway the 4.10s would do better, at a speed of 60 I can still stay under 2000rpms, not sure about a 3.73 but I would imagine the smaller gearing would make higher rpms on highway speeds, the 3.73s would do better in city though

 

You are backwards the smaller (taller) gears create less RPMs on the highway, thus the reason many 1500 have 3.42 gears.

 

I agree that with the AFM 4.10's stand a strong possibility of getting better mileage then the 3.73.