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 > 2014 Silverado 3.42 or 3.73

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jenoble99

S. Indiana

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Posted: 01/20/14 07:41am Link  |  Quote  |  Print  |  Notify Moderator

We tow a similar weight TT with an '09 Silverado. Truck is CC, 4wd, 5.3, 6 sp., and 3.42 rear ratio. One thing I will stress is make sure you get the HD cooling package. It makes a difference in the ratings. Our truck handles our trailer very well. If you can find the max tow, get it, but it wouldn't be a deal breaker for me. I was looking for a max tow when I traded but only located one, it had high miles and a high price. They are rare both new and used. I looked at the ratings and decided we would be good without it.

Draggo

Rochester, NY

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Posted: 01/20/14 07:52am Link  |  Quote  |  Print  |  Notify Moderator

I'm in the same boat as Owenssailor and Indycamp. 2012 Crew Cab Silverado with the 5.3L V8 and the 6 speed transmission pulling a 5700lb dry TT. No complaints. Granted I'm not hitting huge mountains but when I have hit some of the Adirondack mountains it's preformed great, gets me up to the top no problem.


Mike & Company
2012 Chevy Silverado Crew Cab (5.3L V-8, 3.42 rear gear)
2008 KZ Spree 318BHS
Reese W/D & HP DC, Prodigy brake controller

soren

Northeast, southeast, the great plains

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Posted: 01/20/14 02:42pm Link  |  Quote  |  Print  |  Notify Moderator

Thanks for the replies. Another point of reference for me was pulling a 35' 9000LB gvwr TT with an '04 2500HD, 6.0 and 4.10s. I pulled this combo about 5k miles and had no issues other than it's love of gas stations, at 7.5 MPGs typically. After more research it is apparent that the new 5.3 has significantly more HP and torque that that 6.0 did, and the six speed/3.42 combo. is at least as capable as the old 4sp/4.10 is, when towing. Interesting indeed.

roadrider10

Mendon, NY

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Posted: 01/20/14 09:07pm Link  |  Quote  |  Print  |  Notify Moderator

Same experience here also. We are towing 6300 lbs. with a 2012 Sierra CC and 5.3 /3.42 axle. Plenty of power on hills. We tow long distances and get a low of 9.5 mpg. to a high of about 11.5 mpg. Depending on terrain, wind etc.
The new 5.3 should be better with increased payload, power and torque.

BenK

SF BayArea

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Posted: 01/20/14 10:22pm Link  |  Quote  |  Print  |  Notify Moderator

What really matters is the effective ratio at the pavement vs the ICE's torque
curve. Toss in HP curve if you wish, as most understand HP better than torque


-Ben Picture of my rig
1996 GMC SLT Suburban 3/4 ton K3500/7.4L/4:1/+150Kmiles orig owner...
1980 Chevy Silverado C10/long bed/"BUILT" 5.7L/3:73/1 ton helper springs/+329Kmiles, bought it from dad...
1998 Mazda B2500 (1/2 ton) pickup, 2nd owner...
Praise Dyno Brake equiped and all have "nose bleed" braking!
Previous trucks/offroaders: 40's Jeep restored in mid 60's / 69 DuneBuggy (approx +1K lb: VW pan/200hpCorvair: eng, cam, dual carb'w velocity stacks'n 18" runners, 4spd transaxle) made myself from ground up / 1970 Toyota FJ40 / 1973 K5 Blazer (2dr Tahoe, 1 ton axles front/rear, +255K miles when sold it)...
Sold the boat (looking for another): Trophy with twin 150's...
51 cylinders in household, what's yours?...

mkirsch

Rochester, NY

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Posted: 01/21/14 12:11pm Link  |  Quote  |  Print  |  Notify Moderator

The idea that you need 3.73, 4.10 or an even lower gear ratio is outdated 1970's thinking, from back when a big block V8 had a whopping 175HP and transmissions had 3 gears.

Gearing is gearing. Doesn't matter if it's in the transmission or in the rear end.

Nowadays it's in the transmission. The Chevy 6-speed has a super-low 1st gear to get the load moving. 4.something:1 vs the 2.something:1 in a 4-speed.

The Chevy 6-speed has two extra gears between 1st and "direct" to accelerate the load. In fact, the Chevy 6-speed does not have a "direct" (1:1 ratio) gear in the transmission at all. It has a 1.15:1 4th gear and a .9:1 (IIRC) 5th gear.

The fact of the matter is, the engine with a 6-speed/3.42 combination will be turning RPMs similar to a 4-speed/4.10 combination.


2002 Chevy 3500 DRW/8.1/Allison & 2000 Palomino B1500 popup TC

-Yes, I haul a popup with a dually. No, I don't think I need a dually to haul a popup.

fireman41

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Posted: 01/21/14 04:31pm Link  |  Quote  |  Print  |  Notify Moderator

The company I used to drive for had semi trucks that had 2.94s tide to an 10 speed direct drive transmission. They pulled ever dit as good as the the trucks that had 3:55 and 10 speeds with over drive

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Mi

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Posted: 01/22/14 08:18pm Link  |  Quote  |  Print  |  Notify Moderator

Soren,

As others have mentioned, I have pulled 7k with our previous tv, 2010 Silverado 1500 CCSB 5.3/6spd/3.42 combo. Never felt I NEEDED more power when traveling "Up North" here in MI.

Main reason we now have a 2500HD is we were out of payload!!! Watch that and you should be fine!


2013 Silverado 2500HD CCSB LT 4x4 6.0/6spd/3.73
2001 Dutchmen 28BH-SSL
Reese Dual Cam
1987 Yellowstone Ceville 425 RG-Sold, but not forgotten!

rider997

Idyllwild

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Posted: 01/23/14 08:15am Link  |  Quote  |  Print  |  Notify Moderator

soren wrote:

Hopefully some of you have a bit of experience with the newest GM trucks? As a bit of background. I have towed a considerable amount in the last 15 years, with roughly 1/2 dozen TTs and almost as many 1/2 and 3/4 T GM trucks. The issue here is that I'm buying a new 30' TT. The dry weight is 5600LBS, gross of 7500lbs. I would really prefer a GM 1500 Crew 4x4 to pull it with. My last trailer was about 1000lbs lighter and did well with a 5.3/3.73 older Tahoe.

Now that we are in a world of much higher power from the same 5.3 and things like 6 speed transmissions, I'm not sure what I really need? The issue is that trucks on the lot are typically rate at 9500lbs. with the 5.3/3.43 combo, and every dealer has a pile of them. The upgrade is the Max tow package with the 3.73 and roughly an additional ton of rating. The package is overpriced for what you get, and it's pretty rare. Bottom line is, what can I expect when pulling 7K or so, with the 3.43?



I have the same truck (2014 5.3L/3.43/crew cab/4x4) and it pulls a 6,000 lb trailer with no issues, up to around 7,000 feet of elevation or so (at which the truck is losing around 20% of its rated horsepower).

I would say that if you're sticking with the 1/2 ton (1500), the 3.73 gears are definitely more peppy, but the 3.42 is not a deal breaker.

The 2014 5.3L has more HP and torque than the Vortec 6.0 in the 3/4 ton trucks, and the truck's GVWR is lower, so it has no problem pulling the load. The truck will accelerate and hold a grade with no problem. The 6 speed tranny mapping is very good and does not hunt on up-grades. The grade braking function (the transmission will hold a low gear on down grades to allow engine braking and minimal to no use of the brakes) also works like a charm.

I get 10-12mpg pulling a travel trailer at 55-60mph (this includes hilly/mountainous terrain and lots of wind); around 16-18mpg pulling 6,000 lbs of payload on a utility trailer (negligible wind resistance), and about 21mpg unloaded highway mpg.

The new trucks have pretty decent payload ratings - about 1900 lbs even with the crew cab 4x4, so tongue weight and bed payload probably won't push you to a 3/4 ton unless you're carrying motorcycles or the like the bed of the truck.

Empty Nest, Soon

Birthplace of Rivers, WV

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Posted: 02/05/14 06:42am Link  |  Quote  |  Print  |  Notify Moderator

My current truck has the 5.3/3.42 combination. Last truck was a 1998 GMC 2500HD with 6.0/3.73 combo.

Before buying the new truck, I did a lot of research and number-crunching. I was skeptical of the 3.42.

It turns out that the net output thru the 6-speed tranny is lower gearing when compared to the HD 5-speed manual tranny in my last truck. That truck had the 3.73 differential.

Combine the lower gearing thru the tranny with the higher geared differential and the net gearing for the whole system, from crankshaft output to rear wheels, was about the same. Plus, the new 5.3 has a lot more HP and torque than the 6.0 in my old truck.

Old truck was rated to tow 6500 pounds, new truck rated to tow 10,000. (In the real world, the limiting factor on the new truck seems to be hitch weight/carrying capacity, not tow capacity.)

Wayne


Wayne & Michelle

1997 Safari Sahara 3540

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