6.2L (L9H) Owners - Get all your questions answered here

[ChevyTech77]

Did some more light towing with my truck this weekend again and found that I can pull my two place clamshell snowmobile trailer in 6th gear without much fuss at all, at 75 mph and getting 12.5-13 mpg. Granted, the whole setup might only weigh 2200ish lbs rolling down the road but the trailer cap turns this thing into a huge windblock when you're rolling down the highway. Plus, northern lower Michigan is no slouch for decent grades and hilly terrain so although it did downshift to 5th a couple of times, the trans temp never scowered over 125 degrees the whole pull (100 ish miles one way).

 

Again, very impressive seeing as how a friend of mine pulled a very similar trailer for a while (until he upgraded to bigger), with his '08 HD 6l and had to leave the 6 speed in 5th gear and got no better than 9 mpg rolling the same speed.

 

Same goes for how my '98 use to pull this same trailer. While I would never think of trying to pull this trailer in 4th gear in the truck, it would pull it without issue or downshift, in 3rd gear all day long however, at that speed and engine rpm, 10 mpg was the best you were getting, period. 9, if you were bucking a headwind the whole way.

 

Just more reason to love my purchase more and more.

[2010LTZ4x4]

I read somewhere ( which I can't remeber where)that new gen. 6.2 is going to 425hp.

 

Would be nice to figure out how GM is getting the extra power if it is true. eg. Cam, heads. injectors, computer mod,etc...

[EX-F150 owner]

I bet they can acheive that just from a tune

[04SILVRADO]

I wonder if it is just a tuning thing. We could get a flash on our trucks to get the benefit!!

Edited January 31, 2012 by 04SILVRADO

[RyanbabZ71]

I wonder if it just a tuning thing. We could get a flash on our trucks to get the benefit!!

 

 

Most already have

[200kss]

I'm reading through the thread for info. as I just picked up a leftover '11 Chevy that is nearly 2010LTZ4x4's twin. I was looking for a GMC max trailering 1500 to replace my 07 Vmax but ended up with a Z60 suspension 6.2 CC Chevy.

 

I have an NHT/Max trailering question. What exactly comes with this package over the normal trailering package? I know gear ratio is one item as mine has 3.42's and NHT's have 3.73's. Also mine has 20 inch wheels which is a no-go on NHT's AFAIK. I keep reading about spring rates, anyone know the different rates or have any other info? I'll be pulling an open car trailer a lot and a 24ft. enclosed car trailer very seldom. If I pulled it more often I'd have a 2500HD but love the way the 1500's ride compared to the HD's when unloaded.

[becker87]

The NHT comes with 3.73 gears, wider rear springs and the larger rear end( 12 bolt?)

 

On a side note, drove 400 miles roundtrip this weekend, on the way there got 18.8 according to DIC driving 69 with a decent tail wind. On the way back got 15 driving around 70 with no wind. The way back is slightly uphill over the 200 miles. These things are still trucks for sure! Had a couple full throttle runs on the way back that put a smile on my face

[gonzoid]

I read somewhere ( which I can't remeber where)that new gen. 6.2 is going to 425hp.

 

Would be nice to figure out how GM is getting the extra power if it is true. eg. Cam, heads. injectors, computer mod,etc...

 

 

Can you post it up if you figure out where you read it?

[EX-F150 owner]

http://www.gminsidenews.com/forums/f22/semi-confirmed-news-next-gen-2014-trucks-106048/

[gonzoid]

The NHT comes with 3.73 gears, wider rear springs and the larger rear end( 12 bolt?)

 

On a side note, drove 400 miles roundtrip this weekend, on the way there got 18.8 according to DIC driving 69 with a decent tail wind. On the way back got 15 driving around 70 with no wind. The way back is slightly uphill over the 200 miles. These things are still trucks for sure! Had a couple full throttle runs on the way back that put a smile on my face

 

 

yep NHT 3.73 14 bolt,where did you find info about wider springs than non NHT? have info a link?

[RyanbabZ71]

The non-NHT trucks also have the 14 bolt rear end

[ChevyTech77]

Sure, there are differences between the NHT and Non-NHT rear leaf springs, this we all know. It is not that the NHT springs are wider, they are the same width, from what I've measured. I see that the Hybrid Silverado/Sierra's are also listed as taking the same springs as the NHT trucks so while there is no available spring rate information, I'd have to say that the increase is marginal, over the Non-NHT springs, at best. Believe it or not, most of the extra 1,000 in towing capacity probably comes from the gear ratio increase. That happens all the time.

[Stevens03]

Max Trailering Pack

 

Available on select Extended and Crew Cab models, this package extends Sierra max trailer ratings up to 10,700 lbs.¹ It includes:

• Vortec^®6.2L V8 SFI engine
  
• Heavy-duty automatic locking rear differential
  
• Handling/Trailering Suspension Package
  
• 9.5" rear axle
  
• 3.73 rear axle ratio
  
• Front and rear disc brakes
  
• Heavy Duty Trailering Package
  
• Fog lamps
  
• 17" polished cast aluminum wheels
  
• P265/70R17 on-/off-road blackwall tires
  
• Not available with Z71^® Off-Road Suspension Package
  

 

¹ Maximum trailer weight ratings are calculated assuming a properly equipped base vehicle plus driver.

 

Straight off the website

[ChevyTech77]

Straight out of the GM Dealership order reference guide -

 

 

Max Trailering Pack, includes (L9H) Vortec 6.2L V8 SFI engine,

 

 

 

(G80) heavy-duty automatic locking rear differential, (Z85)

 

 

 

Handling/Trailering Suspension Package, (AXN) 9.5" (24.1 cm)

 

 

 

hybrid rear axle, (GT4) 3.73 rear axle ratio, (P46) 4 - 17" x 7.5"

 

 

 

(43.2 cm x 19.1 cm) 6-lug aluminum wheels, (QJP) P265/70R17

 

 

 

on-/off-road blackwall tires, (T96) fog lamps, (JD9) front and rear

 

 

disc brakes and (Z82) Trailering package

[ChevyTech77]

To expand on that............

 

 

Z-85 Suspension Package, Handling/Trailering, heavy-duty, includes

 

 

 

46 mm piston monotube shocks and 36mm front stabilizer bar

 

 

 

1 - Included and only available with (Z82) Trailering package on

 

 

Crew Cab models. Standard on Extended Cab models.

 

Z-82 Trailering Package for MYC 6-speed transmission,

 

 

 

heavy-duty includes trailering hitch platform and 2-inch receiver,

 

 

 

7-wire harness (harness includes wires for: park lamps, backup

 

 

 

lamps, right turn, left turn, electric brake lead, battery and

 

 

 

ground) with independent fused trailering circuits mated to a

 

 

 

7-way sealed connector, wiring harness for after-market trailer

 

 

 

brake controller (located in the instrument panel harness), (K5L)

 

 

 

heavy-duty cooling package, (KC4) external engine oil cooler and

 

 

(KNP) external transmission oil cooler

My truck has the Z82 package, as do all with a 6.2l engine. That makes it even more interesting.