HDhotrod

Howdy, I have a 2003 Silverado 2500hd 4x4 6.0 auto with 4.10s. I recently added a tsp 220r, shorty headers, k&n intake, and a swapped the factory muffler for a di/do magnaflow. Then had it tuned. The truck was quick above 30, off line it had nothing. Stall it up and wouldn't even bark a tire. So tonight just put on a stock set of 243 heads but haven't done tune yet. It feels faster but is still gutless off the line. After all this why do you think it's so gutless down low, Do you think that tuner didn't take off the torque management?

BlueTexan24

The biggest problem with the gutless feeling you're having is the long first gear of the 4l80e combined with the stock stall, and that the truck is 6000+ lbs I'm assuming. That's a lot of weight to push off the line.

Atomic

iTrader: (42)

Torque management is only at the shift and chances are he turned off abuse mode so its not a computer thing. He probably didn't spend a whole lot of time there, but like mentioned the biggest problem is you have a tight torque converter so the engine doesn't get into its powerband very quickly. Its also a problem of perception because now the lowend is probably the same, but the high end feels better so it makes the lowend feel even worse.

EmmerichLSx

iTrader: (5)

Agreed with both comments. You can't just expect to melt the tires down with just a couple small mods.

HDhotrod

I was hoping for atleast a little spin. When I had it tuned before the heads, it was tuned for mid grade gas, now I have the 243s I'll be running premium, in wondering if I'll get more out of a retune. And yea I thought a higher stall may help

Atomic

iTrader: (42)

I know with my lifted truck, with a cam in it it wouldn't spin the tires, but then I put in even a 2600 stall and it would spin without much effort. Aftermarket converter will make a big difference. Depending on how much you tow you don't want to go crazy with it though.

HDhotrod

I still use mine as a work truck, I wanna be able to tow the occasional car, what stall would you recommend? And mine ain't lifted, just on 31s

Atomic

iTrader: (42)

I would go with a 2400ish PI or PTC converter. Tell them its a work truck, but you just want a little more since you have a cam in it. My lifted truck was ~6400lb so it was probably close to yours unloaded.

HDhotrod

Yea I think mines like shy of 5500. And it sucks the 4l80.converters cost alot

madmann26

iTrader: (7)

...and to think, when I had my tranny ordered from RPM, I ALMOST, I say ALMOST, went with the 6 pinion planetary.