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Anyone go from 6.0/6.2 down to a new 2014 5.3

seamonster

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seamonster Enthusiast

seamonster

Posted
Posted

Seriously thinking about going from my 6.0 with 4:10's to a 5.3 with 3:73.

the HP and torque numbers are real close and the the tow rating is actually

higher on the new 5.3.

Do any of you have first hand experience with these!

Will I be dissapointed???

My truck has been great and tows my 9K lb travel trailer GREAT.

I am having trouble letting go of the 4:10's

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svtkidd23 Enthusiast

svtkidd23

Posted
Posted

I had a 2013 Fx4 with 3.73s and the awesome 5.0..0

Well the new 5.3 is leaps and bounds better.. Love this truck

clayp Enthusiast

clayp

Posted
Posted

My 2001 Silverado ECSB Z71 4x4 was my tow vehicle. At 170k miles I swapped in a fresh 6.0l LQ4 with LS6 cam, ported 241 heads, free mods, electric fans, custom 93 octane tune, and long tubes w/o cats. I have to say my new 014 with 3.42 rear end and the 6spd mated to the 5.3l feels about as quick. With a 3.73 I would imagine you would be very happy. Someone here posted some youtube vids of the 5.3l running neck and neck with an ecoboost, and a tick behind a 6.2l Denali

2014 Sporty Shorty Enthusiast

2014 Sporty Shorty

Posted
Posted

You won't be dissapointed if you switch, the big key feature with these new engines is the direct injection paired with the vvt. You now have a huge power band that has good bottom end lug and good high end. Take a look at a dyno sheet of a stock lq4 and a stock l83, you will be surprised of the results.

Joe_K Enthusiast

Joe_K

Posted
Posted

Seriously thinking about going from my 6.0 with 4:10's to a 5.3 with 3:73.

the HP and torque numbers are real close and the the tow rating is actually

higher on the new 5.3.

Do any of you have first hand experience with these!

Will I be dissapointed???

My truck has been great and tows my 9K lb travel trailer GREAT.

I am having trouble letting go of the 4:10's

 

I think you'll be quite happy with the new 5.3 and 3.73's!! What year is your current ride? If you have the old 4-speed with the 4.10's the new 6-speed with 3.73's will have a mechanical advantage over it in the lower gears. You will notice a lot more shifting with the new 6-speed though.

dlockwood26 Enthusiast

dlockwood26

Posted
Posted

I am going from a 2011 Denalli to a 5.3 Crew Cab SLT. I am very happy so far with Performance and Fuel Economy!!!!!!

Are there any 5.3 with 3.73 out yet? Or are you compareing the 5.3 with 3.42 or 3.08?

clayp Enthusiast

clayp

Posted
Posted

Are there any 5.3 with 3.73 out yet? Or are you compareing the 5.3 with 3.42 or 3.08?

I think the 3.73 is only with the max trailering package which is supposed to arrive soon

crushNchowda Senior Enthusiast

crushNchowda

Posted
Posted

The 5.3 w/ 3.42s is slightly more powerful and accelerates better than the 6.0- it is comparable in power to the 6.2. In per-2014s but I think the last 6.2 was faster- although it had AWD so that is a bit misleading. The new 5.3 w/ 3.42 should more than suffice coming from a 4 speed 6.0 regardless of rear end. DO NOT get the 3.08s

 

The 3.42s w/ the new 5.3 seem perfect. I haven't driven one yet but the 3.73 would seem overkill, the mpg will suffer so badly I'd prefer just paying the $2000 for the new 6.2 and stick w/ 3.42 gears.

 

Best bang for the buck would probably be a 5.3 w/ 3.42s and an aftermarket tune. Apparently these new direct injected v8s respond extremely well to tuning adjustments

2017HD Enthusiast

2017HD

Posted
Posted

I've been wondering the same thing - I currently drive an 07 2500HD with the 6.0L 6 spd and 4.10 rear end. I also tow a 6000 lb 24' travel trailer. I can handle most hills in 4th making 50 MPH at 3000 RPM.

 

I see where the new 5.3 has similar HP and Torque numbers as my current engine. While I think that the 6.2L 3.42 would be a nice combo - I don't like the fact that you have to either get the LTZ or Denali to get it. I can get the 5.3/3.73 in the LT or SLE trim that I want. I would like to see the EPA numbers for both.

 

The difference in MPG between the 3.08 and 3.73 would be about 17% and the 3.42 to 3.73 is about 8%

 

Also wheels and tires play a big part of how much of that torque is converted into Force

EChavez Enthusiast

EChavez

Posted
Posted

I'm actually upgrading. I had a 2011 Sierra 5.3 and now drive a 2007 Silverado 5.3. I honestly don't tow that much but this time around I opted for the 6.2. It's more of a bragging right and personal preference. But I'm sure the 5.3 with a tune and 3.42 gears at the least will be enough for your towing needs. If you really can't live without the power get the 6.2 with 3.42's and you'll be set.

oldmann Senior Enthusiast

oldmann

Posted
Posted

Several members here have dumped or are working on dumping their 2014 3.08 5.3L trucks because it was not up to their expectations in the power department. If you go backwards, you will not like the results.

I would bet the 3:08 with a 6 speed is just as fast and powerful as the 3:42 or even 3:73 with a 5 speed. The six speed does really make a difference. I had a 07 5.3 3:73 5sp and now haw a 13 5.3 3:08 6 speed and the 6 speed is the same power wise pulling a heavy load. It is also faster bobtail.

Joe_K Enthusiast

Joe_K

Posted
Posted

Several members here have dumped or are working on dumping their 2014 3.08 5.3L trucks because it was not up to their expectations in the power department. If you go backwards, you will not like the results.

 

I'm not looking to dump my truck at all, perfectly happy with the 3.08's but I have the lighter 18" wheels so that may make a difference. Also, I don't tow and wanted the best combo for highway mileage. It all depends what you need your truck for, in reality the 4.3 would've been fine for me, I just need a bed for dirty work around the house and going back and forth to Lowe's. I came from a RCSB 2012 Hemi Ram with 3.55 gears. My 5.3 Silverado with the 3.08's has more punch off the line then the Ram, mostly due to the lower trans ratio's in the GM trans versus the Ram's 65rfe trans. However, if you're gonna tow anything more than a tiny utility trailer, get the 3.42's, or the upcoming 3.73's.

redwngr Senior Enthusiast

redwngr

Posted
Posted

I've been wondering the same thing - I currently drive an 07 2500HD with the 6.0L 6 spd and 4.10 rear end. I also tow a 6000 lb 24' travel trailer. I can handle most hills in 4th making 50 MPH at 3000 RPM.

 

I see where the new 5.3 has similar HP and Torque numbers as my current engine. While I think that the 6.2L 3.42 would be a nice combo - I don't like the fact that you have to either get the LTZ or Denali to get it. I can get the 5.3/3.73 in the LT or SLE trim that I want. I would like to see the EPA numbers for both.

 

The difference in MPG between the 3.08 and 3.73 would be about 17% and the 3.42 to 3.73 is about 8%

 

Also wheels and tires play a big part of how much of that torque is converted into Force

Build and price lets the 6.2L 3.73 be selected in an SLT, but it also requires the other max towing goodies.

jj46 Enthusiast

jj46

Posted
Posted

Not completely apples to apples, but something to note, it was posted in another thread that the 5.3 on E85 makes 380 hp... I'm anxious to try it out. Sure you lose a bit of mileage, (about 30 percent), and the fuel is only about 20 percent cheaper... however, for an extra 25 horse I want to try it!

 

Interestingly, I hooked a scan-tool up to mine, and there is a reading for the alcohol percentage in the fuel... mine was reading 9.6 percent, pretty accurate as I'm using 10% ethanol fuel now.

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