[river_rat]

Hey I have a 2013 ccsb silverado, has a 6.2 with 3.42 gears, have 33's now, may go to 35s come spring time, but I have a sled deck on my truck, and fairly often have 1 or 2 quads on it, and now that it is winter it will have 1 to 2 sleds on it, just feel as though I would like a lower gear, but don't know if 3.73 would be worth it? I don't do a crazy amount of hwy driving so I'm not too concerned about mileage, seeing as I get about 20l/100km (14mpg) no matter city or hwy. any input is greatly appreciated! As far as mods go it has cai, 3.5" catback exhaust, and an edge CS chip

 

[Csanders1992]

Go 4.10 no doubt. Especially since you plan on 35s. If your not concerned with milage just get 4.56, it'll be nice when you have 35s


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[NuckenFuts]

4:56 if you are going 35" tires. I have 5.13 with 33" tires and even that is fine for me.

 

[PHATDAN420]

410s or steeper

 

[Bumpers]

If you are forsure goin 35s go with 4.30 or 4.56

 

[07blackz71]

Since you have a 6 speed trans I would get the 4.10 for sure. Mine has 3.73 from the factory and does good with the 33" tires I have and when I tow stuff.

 

[ShredSled]

Does it have the 6l80e or 4spd?

Get 4.30's minimum, probably be happier with 4.56 if you're going 35's and hauling a load often. You wouldn't even notice a difference going to 3.73.

 

[Csanders1992]

All 13s came with 6 speeds


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[11MPG]

Here's a layout of 4.10, 4.30, and 4.56 with a 33x12.5 and a 35x12.5. This is also assuming the tire size with the weight of the truck on it. My opinion is the 4.30s because it would be more worth while than going from 3.42 to 4.10. If you had a 4L60 or a 4L80 transmission I would say go 4.56, but your 6 speed has a very deep 1st gear. However if it's performance you want, go 4.56.

Speed/RPM with a 33x12.5 tire and your 6 speed

4.10 gears:
45 mph = 1,310 rpm
55 mph = 1,600 rpm
65 mph = 1,890 rpm
75 mph = 2,180 rpm

4.30 gears:
45 mph = 1,375 rpm
55 mph = 1,680 rpm
65 mph = 1,985 rpm
75 mph = 2,290 rpm

4.56 gears:
45 mph = 1,450 rpm
55 mph = 1,780 rpm
65 mph = 2,100 rpm
75 mph = 2,420 rpm

Speed/RPM with a 35x12.5 tire and your 6 speed

4.10 gears:
45 mph = 1,235 rpm
55 mph = 1,510 rpm
65 mph = 1,780 rpm
75 mph = 2,055 rpm

4.30 gears
45 mph = 1,295 rpm
55 mph = 1,580 rpm
65 mph = 1,870 rpm
75 mph = 2,155 rpm

4.56 gears:
45 mph = 1,370 rpm
55 mph = 1,680 rpm
65 mph = 1,980 rpm
75 mph = 2,290 rpm

 

[Chevy305]

4.56s Do it once, do it right. Don't leave gear and power on the table.

 

[NuckenFuts]

I would also like to point out that I gained better gas mileage going from 3.73 to 5.13 by 4mpg on HWY. You have to remember these bigger tires are a shit ton heavier then stockers so in my case motor was lugging down HWY at 1600-1800RPM and it wasnt in a good power band.

I get even better gas mileage at 3,000 RPM then 2,600 RPM but thats due to my cam.

 

[all-terrain82]

I got a 2013 with the 5.3 and 3.42 gears and I'm seriously considering a gear change. I'm currently running 305/65-18 tires and my mileage is suffering however in the future 35's and 20x10 wheels will come. I was thinking 4.10 gears. Where/what all do I need to buy to change my gears and where is a good place to get them.

 

[11MPG]

I got a 2013 with the 5.3 and 3.42 gears and I'm seriously considering a gear change. I'm currently running 305/65-18 tires and my mileage is suffering however in the future 35's and 20x10 wheels will come. I was thinking 4.10 gears. Where/what all do I need to buy to change my gears and where is a good place to get them.

Go 4.56 or 4.88. I recommend 4.88 because with the extra rolling resistance from a 35 you will get better results. 4.10 would be a waste of money. As for install search the area for local transmission shops and get quotes on an install. you will need to do the front and rear. In the rear axle upgrade to an Eaton Truetrac Carrier as well. Much stronger than the OEM unit.

Speed/RPM with a 35x12.5 tire and your 6 speed

4.56 gears:
45 mph = 1,370 rpm
55 mph = 1,680 rpm
65 mph = 1,980 rpm
75 mph = 2,290 rpm

4.88 gears:
45 mph = 1,470 rpm
55 mph = 1,800 rpm
65 mph = 2,120 rpm
75 mph = 2,450 rpm

 

[river_rat]

So I figured out my solution to wanting gears, ordered a 2015 duramax dually instead.. Lol

 

[all-terrain82]

Is there any part numbers for the gears and stuff I'll need that you might know so I can start shopping it out