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3.08 to 4.56 Gear swap?

Neutril

By Neutril
in Engines & Drivetrain

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Neutril Enthusiast

Neutril

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I was charged $350 an axle (labor only) on my 02 plus supplies and taxes. I think mine was $830 out the door. If you wait, I'm sure in the next year or so Yukon will have direct replacement gear sets. Im sure they're in product development by now. If you look at how many newer lifted trucks there are, most of them are part of the GM family. They know they're losing out on money right now, but from what I've seen no one else has gear sets out either

 

 

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I just don't want to put that much more strain on my transmission for that long. I drive a 1600 mile round trip every month or so. Give or take a hundred miles.

 

 

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Tek74 Enthusiast

Tek74

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I have a '14 Silverado Z71 with the factory 3.08 ratio. I'm wanting to get 4.56 gears. I am currently running 35s. I drive a good 800 mile trip every month because I work out of state. Thing is, I don't know what to order. I know I'll need a new carrier, but will I be able to keep my factory posi track? And what's a good brand that won't devour my wallet?

 

 

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I'm familiar with the common gear ratios (3:08, 3.42, 3:72, etc.) and the fact that higher ratios are better for heavier work loads. But why the big jump to a 4:56 for a 5.3L V8 engine? Sorry to ask, but I'm just trying to understand this stuff better.

Badass69 Senior Enthusiast

Badass69

Posted
Posted

 

I'm familiar with the common gear ratios (3:08, 3.42, 3:72, etc.) and the fact that higher ratios are better for heavier work loads. But why the big jump to a 4:56 for a 5.3L V8 engine? Sorry to ask, but I'm just trying to understand this stuff better.

Making up for going to a much heavier mass 35" tall tire. The bigger the tire the deeper the gear set to compensate. In his case it will be better than the factory 3.08's and stock rubber were performance wise by quite a bit. More or less on par with a 3.73 geared truck with stock tires. If you crunch the numbers going with a 31.65" tall tire you need 4.10 to match the rpm of 35's and 4.56. But with the heavier mass it will be more on par performance wise to a 3.73 truck. Great upgrade none the less.

 

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LongrangeLauber Senior Enthusiast

LongrangeLauber

Posted
Posted

 

I'm familiar with the common gear ratios (3:08, 3.42, 3:72, etc.) and the fact that higher ratios are better for heavier work loads. But why the big jump to a 4:56 for a 5.3L V8 engine? Sorry to ask, but I'm just trying to understand this stuff better.

If he wanted close to stock performance he would go to a 3.73. But why do all that work to have crappy stock 3.08 equivalent performance? The higher the ratio the easier it is for the truck to turn them thus less strain on the tranny. 4.10 would be a minimum but just to help turn the extra weight of the tires as well as for it to launch better, 4.56s FTW!

 

 

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Neutril Enthusiast

Neutril

Posted
  • Author
Posted

 

I'm familiar with the common gear ratios (3:08, 3.42, 3:72, etc.) and the fact that higher ratios are better for heavier work loads. But why the big jump to a 4:56 for a 5.3L V8 engine? Sorry to ask, but I'm just trying to understand this stuff better.

I'm running 35s on 22s. So if I go up in gear ratio then my truck won't have as much trouble finder which gear to be in to turn my tires.

 

 

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Tek74 Enthusiast

Tek74

Posted
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Thanks guys. I had no idea that rear end gear ratios had anything to do with tire/wheel size. I thought it only had to do with towing/hauling.

 

I have a 3:42 rear end and factory 18" wheels with All Season tires. I'm considering going to 20" wheels with All Terrain tires (275/60R20). Would I be good with the 3:42 rear end?

LongrangeLauber Senior Enthusiast

LongrangeLauber

Posted
Posted

Thanks guys. I had no idea that rear end gear ratios had anything to do with tire/wheel size. I thought it only had to do with towing/hauling.

 

I have a 3:42 rear end and factory 18" wheels with All Season tires. I'm considering going to 20" wheels with All Terrain tires (275/60R20). Would I be good with the 3:42 rear end?

That seems to be pretty close to stock size, you'll be fine running 3.42's on the 6 speed tranny

 

 

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Tek74 Enthusiast

Tek74

Posted
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That seems to be pretty close to stock size, you'll be fine running 3.42's on the 6 speed tranny

 

Good.....that's the answer I was hoping for.

LongrangeLauber Senior Enthusiast

LongrangeLauber

Posted
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Honestly, the people over at ringpinion.com are very helpful and they also have awesome prices. This is where i bought all my stuff.

 

I also had them send the gears to a shop to get the cryo'd

 

 

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Steeks Enthusiast

Steeks

Posted
Posted

So what's the word on these 3.23s in the 2015 6.2 all terrains with the 8 speed trans? Just don't seem right everything I've been looking at seems to have them.

LongrangeLauber Senior Enthusiast

LongrangeLauber

Posted
Posted

So what's the word on these 3.23s in the 2015 6.2 all terrains with the 8 speed trans? Just don't seem right everything I've been looking at seems to have them.

Currently, as far as im aware, the trucks with the beefier 9.76" rear axles (standard on 6.2 trucks and trucks with max tow) don't have any options as far as regearing. I haven't looked around lately so the aftermarket world may have caught up and finally produced gears for them

 

 

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Neutril Enthusiast

Neutril

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Okay guys, so my 3.08 rear end starting making a howling sound last week and I called my dealership and they said to bring it in. They said it was no longer under warranty due to the lift, so since they already had it apart I told them to put 4.56s in it. They priced me $2500 out the door and it would be a couple of days. Well they called me back that following morning and said that the GM housing can't hold 4.56s and that to make them fit they'd have to dremel around inside the housing. So luckily there was a GM Rep there when they told me this and he told them to return it to 3.08 as if it was under warranty. So I got it fixed for free. Also I might add that they said the cause of the howling was my spider gears weren't getting properly lubricated due to the angle of my driveshaft from the 9" suspension lift. Now I got to thinking, I already got the loan to regear my truck, should I just go to 3.73 or wait until 4.56s are available.. Comments please?

 

 

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LongrangeLauber Senior Enthusiast

LongrangeLauber

Posted
Posted

Okay guys, so my 3.08 rear end starting making a howling sound last week and I called my dealership and they said to bring it in. They said it was no longer under warranty due to the lift, so since they already had it apart I told them to put 4.56s in it. They priced me $2500 out the door and it would be a couple of days. Well they called me back that following morning and said that the GM housing can't hold 4.56s and that to make them fit they'd have to dremel around inside the housing. So luckily there was a GM Rep there when they told me this and he told them to return it to 3.08 as if it was under warranty. So I got it fixed for free. Also I might add that they said the cause of the howling was my spider gears weren't getting properly lubricated due to the angle of my driveshaft from the 9" suspension lift. Now I got to thinking, I already got the loan to regear my truck, should I just go to 3.73 or wait until 4.56s are available.. Comments please?

 

 

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That's a huge difference, GM just doesn't have a GM set of 4.56 gears period. You'll have to go aftermarket, dealers hate that word lol

 

 

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Neutril Enthusiast

Neutril

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Well, thing is, they ordered all the parts thru aftermarket vendors. And the vendor said not to do it because it's not worth it and it won't even last as long as my 3.08s. Which only lasted 12k miles. Lol. They also said if they did it they couldn't put a warranty on it, actually nobody would because of the housing. They can put a warranty on 3.73s and its OEM.

 

 

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