Verified customer reviews
This tune file is built for 1998-2006 GM LS truck and SUV platforms using the 4.8L, 5.3L, or 6.0L engine family.
If you have a BTR Truck Norris, Texas Speed Chopacabra, or similar LS truck cam in one of these trucks or SUVs, this tune will work for you. Send your factory read file and full mod list, and we will build the calibration around your exact setup.
This is not a random pulled file. Your tune is built around your factory read file, operating system, engine size, transmission, cam setup, and full modification list. Most setups take 3-5 revisions, and we finish the tune instead of leaving you stuck after one file.
These Gen III GM trucks respond great to a good camshaft, but the tune matters. A cammed 4.8L, 5.3L, or 6.0L truck needs the airflow, idle, fueling, spark, and transmission behavior corrected so it starts clean, idles right, drives smooth, and does not fight you at every stoplight.
These vehicles share the 1998-2006 GM truck/SUV LS platform family when equipped with supported 4.8L, 5.3L, or 6.0L engine combinations.
This is a performance calibration designed for modified GM LS trucks and SUVs running a camshaft and supporting parts.
You are responsible for making sure your build quality is up to par before flashing or running this tune. Your engine, valvetrain, fuel system, drivetrain, wiring, sensors, injectors, exhaust, and all supporting parts must be correctly installed, mechanically sound, and capable of handling increased performance.
Poor installation, worn parts, incorrect valve spring setup, wrong pushrod length, weak fuel supply, vacuum leaks, exhaust leaks, bad sensors, or unsafe mechanical condition can cause drivability issues or engine damage that no tune can fix.
J.R. Jones Automotive & Performance is not liable for engine failure, drivetrain damage, PCM/ECU damage, or any issue caused by poor build quality, improper installation, unsafe flashing practices, incorrect customer-supplied information, or misuse of this tune.
Always flash using a hard-wired USB connection. Do not flash over weak connections, unstable power, or while the vehicle battery is low.
Use a battery charger or maintainer during the write process. Do not interrupt the flash once writing has started.
Customer is responsible for having the proper tuning hardware, software, licensing, and stable equipment needed to read and flash the vehicle.
If your Silverado, Sierra, Tahoe, Yukon, Suburban, Avalanche, Escalade, Hummer H2, or TrailBlazer SS has injectors, converter changes, gear/tire changes, boost, nitrous, or anything beyond a normal Truck Norris / Chopacabra style cam setup, use the Build Your Tune page so we can match the calibration to your exact vehicle.
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