iF YOU WERE TO GEAR SWAP....3.73 OR 4.11

[VanillaGoorilla]

iF YOU WERE TO GO TO A LOWER RATIO?
ANY PARTICULAR BRAND OR SHOP FOR THE PARTS/KIT ?

 

[strutaeng]

You need to provide other information such as transmission (6L80e?), tire size, and use of the vehicle (mostly highway driving, or towing?). Any engine mods such as cam/stall swap? Or stock engine?

Also, what is your current gear ratio? Is this a standard wheelbase or extended wheelbase?

 

[exp500]

Expected use is the deciding factor. Heavy Towing or more than occasionally short distance higher number. Remember it's only 10% difference.

 

[Marky Dissod]

If you were to go to a lower ratio?

If your Tahoe LTZ has a 4L60E, then the question is between 4.10 and 4.30.
If your tires are taller than 32", or if you tow anything over 4500lb, or both, 4.30.

If it has a 6L80E, then the question is between 3.42 and 3.73.
If your tires are taller than 32", or if you tow anything over 5000lb, or both, 3.73.

My Tahoe Z71 came with 3.73 already. Every time I floor it, I die a lil inside.
Once I can afford 4.10 for the front and the rear, it's 4.10, baby.

 

[swathdiver]

I've already decided for my 6-speed equipped Yukon XL. She's getting AAM 3.73 gears. Actually changing the differential to the 9.5" 14-Bolt semi-floater and bought another low mileage front differential with 3.73 gears to save time. Also replacing the front differential mounts and all u-joints with the AAM brand. Considered changing rear driveshaft to 1415 universal joints but decided against it for now. Having a hard enough time getting this project going.

I bought the GM specific tools and am using AAM or GM OE parts. AAM was the OE supplier for the axle and drive shafts and universal joints.

Axle is getting new parking brake anchors, backing plates, parking brakes and pads and rotors.

GM produced GMT900s with 6-speeds and 3.73 gears so it ought not have a negative effect on service life or highway mileage. We shall see.

 

[Marky Dissod]

Was always under the impression that 3.42 was the most aggressive axle gear GM used OE with 6L80E.
Which GMT900s came with 6L80E & 3.73? Should've been an option for every single one, I say.
Cannot possibly imagine how it could have any negative effect on service life.
If it has any negative effect on highway MpG, I'd not be surprised if it were counterbalanced by an improvement in city MpG.

 

[Geotrash]

I've already decided for my 6-speed equipped Yukon XL. She's getting AAM 3.73 gears. Actually changing the differential to the 9.5" 14-Bolt semi-floater and bought another low mileage front differential with 3.73 gears to save time. Also replacing the front differential mounts and all u-joints with the AAM brand. Considered changing rear driveshaft to 1415 universal joints but decided against it for now. Having a hard enough time getting this project going.

I bought the GM specific tools and am using AAM or GM OE parts. AAM was the OE supplier for the axle and drive shafts and universal joints.

Axle is getting new parking brake anchors, backing plates, parking brakes and pads and rotors.

GM produced GMT900s with 6-speeds and 3.73 gears so it ought not have a negative effect on service life or highway mileage. We shall see.

Gearing up for that future camper, literally!

 

[blackelky]

If your Tahoe LTZ has a 4L60E, then the question is between 4.10 and 4.30.
If your tires are taller than 32", or if you tow anything over 4500lb, or both, 4.30.

If it has a 6L80E, then the question is between 3.42 and 3.73.
If your tires are taller than 32", or if you tow anything over 5000lb, or both, 3.73.

My Tahoe Z71 came with 3.73 already. Every time I floor it, I die a lil inside.
Once I can afford 4.10 for the front and the rear, it's 4.10, baby.

Let me know about those 3.73s when your ready to sell. You have the front diff 3.73 as well ?

 

[Marky Dissod]

Front & rear 3.73 differentials, uh huh. May not be ready for this for at least 6 months ...
When I am ... who's got 4.10 differentials? ...

 

[swathdiver]

Was always under the impression that 3.42 was the most aggressive axle gear GM used OE with 6L80E.
Which GMT900s came with 6L80E & 3.73? Should've been an option for every single one, I say.
Cannot possibly imagine how it could have any negative effect on service life.
If it has any negative effect on highway MpG, I'd not be surprised if it were counterbalanced by an improvement in city MpG.

With the 6L80, it was the NHT equipped pickup trucks with the 6.2 motor. The 6L90 equipped 2500 wagons and some pickups also had 3.73s. Both had 6.0 motors.