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View Full Version : 03 2500HD 2wd vs. 06 2500HD 4x4 power question


lasher66
03-14-2006, 02:03 PM
Hi,
I recently sold my 2003 Chevy Silvarado 2500HD 2wd and bought the exact same truck but it is the 2006 Silverado 2500HD with 4wd. Both trucks have the 6000 motor 6.0L in them. My question is that is seems my new 4x4 truck seems to have quite a bit less power than my 2wd. With or without the trailer attached, it seems like it has way less torque. My 2wd truck could take off really quick but the 4wd truck must be geared way lower or something. If anyone can explain this, it would be greatly appreciated. Thanks

Jason

TLS
03-14-2006, 02:10 PM
A couple of things could come in to play here:


Variences in engine output.

Weight of transfercase and Front diff/related components.

Emissions and/or emissions component/programming related.

Broken in '03 vs tight/un-broken in '06


Gearing should be the same (4.10)

Cab configuration is the same, right?

lasher66
03-14-2006, 04:56 PM
Cabs the same.

Jason

TLS
03-14-2006, 05:22 PM
Well, it must be the slight increase in weight (4x4 components), their associated drag, and the un-broken in part all combining for this feeling.

Is there a way you can go test drive another identical '06 at a dealer lot?

4SeasonsLandscapingOCDLLC
03-16-2006, 12:32 PM
Its the torque management software in your new truck. I tgives a feeling of less power. Its a big brother feature that can be eliminated with a custom computer tune. check out www.waitformeperformance.com. Jesse can answer all of your questions and the tune costs around $150.00. THe difference is night and day.
JON:drinkup:

TLS
03-16-2006, 12:34 PM
'03's had TQ/Management as well.

Maybe not as much?

lasher66
03-16-2006, 02:01 PM
So you think the torque management software might be set different for 4x4 compared to 2wd. I guess if they tune it this way, maybe it is just meant to keep it I guess. Just was wondering why there is a power difference. My 03 truck used to seem pretty fast, now this one I think is just set up for more torque instead of speed. Thanks

Jason

TLS
03-16-2006, 05:54 PM
Mine keeps getting faster and faster as the miles add up.

I'd more likely think its break in. Or a computerized break-in.

nephilim0167
03-16-2006, 08:47 PM
In my opinion, two things are coming into play here. First off, 4x4 vehicles obviously are going to be heavier. Your drivetrain just got a whole lot heavier. Another thing that I think is acting here is that most newer vehicles have a computerized break in. The first X amount of miles (mine was 3,000) your vehicles computer is basically programming itself. It could also be just how the truck is from Chevy. Look around online and get some dyno numbers. If all else fails, take the truck to get it dyno'd and see what it's putting out as opposed to what it SHOULD be putting out. If there's a dramatic difference I would consult the dealer you purchased it from. Good luck.

TJLANDS
03-16-2006, 09:09 PM
I have all GMC's thru 2005 . 6.0 4x4. After 2000 they all seem pretty similar.
The one truck that is 2WD(2002) feels the same until I look for the stick(or button) to put it in 4x4, lol. If it feels that different I would have it checked out. What rear is in the 06? TLS had mentioned 4.10 but I know they offered the 3.83.or was it 3.93. That does make a slight differance in feel.

TLS
03-16-2006, 10:19 PM
ALL 2500HD 6.0's are 4.10. You don't have a choice.

4SeasonsLandscapingOCDLLC
03-17-2006, 05:23 PM
THere is more tq management and "abuse mode" programing in the 04-06. I believe the 03 may have been a cable actuated throttle body, where the newer ones are "drive by wire" which is a little sluggish. I know that the tune changed mine completely!

pottstim
03-17-2006, 09:33 PM
THere is more tq management and "abuse mode" programing in the 04-06. I believe the 03 may have been a cable actuated throttle body, where the newer ones are "drive by wire" which is a little sluggish. I know that the tune changed mine completely!


If i'm not mistaken, they started the drive by wire throttle control in 2003. I have an '04 with drive by wire and it certainly has a different feel to it as opposed to the old mechanical style. At times it almost has a numb feel to it, but the 4800 in my truck really comes alive at 2500+ rpm.

The Yard Barber, Inc.
03-18-2006, 11:31 PM
I think that they may have changed the gear ratio but i'm not sure

TLS
03-19-2006, 08:58 AM
If it's an HD it's always been 4.10 for the 6.0

rodneyskip
03-19-2006, 09:25 AM
If it's an HD it's always been 4.10 for the 6.0

I had an 03' HD with 3.73 and the 6.0. Sold it a year ago February.