Product Description
EDGE PRODUCTS 98655 EAS SOTF – SHIFT-ON-THE-FLY CONTROL FOR 2001–2004.5 LB7 DURAMAX
The EDGE PRODUCTS 98655 EAS SOTF (Shift-On-The-Fly) accessory lets your 2001–2004.5 Chevy Silverado and GMC Sierra 2500/3500 6.6L LB7 Duramax change custom tunes right from the Edge Insight CS2, CTS2, or CTS3 monitor screen – no more drilling the dash for a bulky 5-position knob. When paired with compatible custom tuning (EFI Live, EZ Lynk, or similar voltage-based SOTF/DST files), this harness outputs a clean 1–5V signal so you can move between power levels while you drive, keeping your interior looking factory while your LB7 works harder than ever.
Built on the Edge EAS expandable accessory system, the 98655 integrates seamlessly with other Edge EAS sensors and accessories to give you a professional, plug-and-play solution for tune control and data logging on your LB7 Duramax.
KEY FEATURES – EDGE 98655 EAS SOTF
- Dedicated Shift-On-The-Fly (SOTF) accessory for 2001–2004.5 GM 6.6L LB7 Duramax 2500/3500 trucks.
- Replaces traditional 5-position SOTF/DST rotary switches with clean, on-screen control via Edge Insight.
- Outputs 1–5V signals that most custom tuners use to select up to five power levels.
- LB7-specific harness designed to tie into the ECM SOTF/DST circuits – no cutting or splicing required.
- Works with popular custom tuning platforms (EFI Live, EZ Lynk, etc.) that support voltage-based SOTF/DST.
- Ideal for trucks that tow, daily drive, or play at the track with multiple custom tune files.
FITMENT – EDGE PRODUCTS 98655 EAS SOTF (LB7 DURAMAX)
- Engine: 6.6L LB7 Duramax V8 diesel
- Platform: GM Silverado/Sierra HD
- Vehicles:
- 2001–2004.5 Chevrolet Silverado 2500HD / 3500
- 2001–2004.5 GMC Sierra 2500HD / 3500
- Model Years: 2001, 2002, 2003, 2004 (early 2004.5 LB7 trucks – verify by VIN/emissions label)
- Drivetrain: 2WD and 4WD
- Requires:
- Edge Insight CS2, CTS2, or CTS3 monitor with EAS support (sold separately).
- Compatible custom tunes that use a 1–5V switch input for SOTF/DST power levels.
If your tuner specifically calls for a voltage-based SOTF/DST switch on an 01–04.5 LB7 Duramax, the 98655 provides that signal and lets you command your tune levels directly from the Edge Insight screen.
HOW THE EDGE PRODUCTS 98655 EAS SOTF WORKS
Many LB7 custom tuning packages assign each tune file to a different voltage: 1V, 2V, 3V, 4V, or 5V. The ECM watches this input and switches tunes based on the voltage it sees. The 98655 EAS SOTF harness replaces the physical dash switch and lets the Edge Insight handle those voltage steps electronically.
- The 98655 harness connects the Insight’s EAS system to the LB7 ECM SOTF/DST circuits.
- The Insight outputs one of five voltage steps (approximately 1–5V) based on your selection.
- Your custom tuning interprets those voltages just like a mechanical SOTF knob.
- You pick power levels using on-screen controls instead of a separate dash-mounted switch.
This setup gives you factory-quality installation with fewer holes, fewer wires under the dash, and cleaner integration with your digital gauge monitor.
WHAT’S INCLUDED
- Edge 98655 EAS Shift-On-The-Fly (SOTF) Accessory – LB7 Duramax specific.
- Harness/interface wiring to connect the Edge Insight to the LB7 ECM SOTF/DST pins.
- Basic installation instructions from Edge.
Note: Edge Insight monitor and custom tuning are not included. You must already have, or plan to purchase, compatible tunes and an Insight CS2/CTS2/CTS3 device.
CROSS-REFERENCE / RELATED EDGE PRODUCTS AT CPP DIESEL
Build a complete Edge Insight + EAS package for your LB7 Duramax with these related EDGE PRODUCTS available at CPP Diesel (all links go to Edge products on cppdiesel.com):
- EDGE PRODUCTS 98653 EAS SOTF 2011–2016 GM 6.6L LML DURAMAX – similar SOTF accessory for late-model LML Duramax trucks.
- EDGE PRODUCTS 98654 EAS SOTF 2004.5–2010 GM 6.6L DURAMAX – perfect if you also own or work on LLY/LBZ/LMM-powered Duramax trucks.
- EDGE PRODUCTS 22414 PULSAR LT 2015–2016 SILVERADO/SIERRA 2500/3500 6.6L DURAMAX – inline performance module for newer Duramax applications that pairs well with Edge Insight.
Specifications for EDGE PRODUCTS 98655
| Field | Value |
|---|---|
| Brand | Edge Products |
| Part Number | 98655 |
| Product Name | EAS Shift-On-The-Fly (SOTF) Accessory |
| Application | 2001–2004.5 Chevrolet Silverado / GMC Sierra 2500/3500 with 6.6L LB7 Duramax diesel |
| Product Type | EAS accessory / SOTF voltage selector harness |
| UPC | 810009930556 |
| GTIN | 810009930556 |
| Emission Code | 6 (for off-road/competition or where allowed – confirm local regulations) |
| Fuel Type | Diesel |
| Approx. Product Weight | 1.0 lb |
| Approx. Product Dimensions (L × W × H) | 9.5" × 6.25" × 2.75" (package) |
| Typical Shipping Weight | 2–3 lbs (boxed, depending on packing) |
| Typical Shipping Method | Standard ground, small parcel; free shipping promotions may apply |
| Compatibility Notes | Requires Edge Insight CS2/CTS2/CTS3 and compatible voltage-based custom tuning (SOTF/DST). |
| Prop 65 Warning | Cancer and Reproductive Harm – www.P65Warnings.ca.gov |
FAQ – EDGE PRODUCTS 98655 EAS SOTF
Will EDGE PRODUCTS 98655 work on my stock 2001–2004.5 LB7 without custom tuning?No. The 98655 EAS SOTF harness is designed to work with custom tuning that already uses a 1–5V SOTF/DST input. On its own it will not add power or create new tune files – it simply replaces the physical SOTF switch with electronic control through the Edge Insight monitor.
Which Edge monitors are compatible with the 98655 EAS SOTF?
The 98655 is built for the Edge Insight CS2, Insight CTS2, and Insight CTS3 devices that support the EAS (Expandable Accessory System) harness. Make sure your Insight firmware is current and that EAS accessories are enabled in the settings before installation.
How many power levels can I select with the 98655 on my LB7?
Most custom LB7 SOTF tunes use up to five voltage steps (1V, 2V, 3V, 4V, 5V), which correspond to up to five tune positions. The exact number of levels available depends on how your tuner configured the files, but the 98655 harness can support all five positions when the tuning is set up for it.
Does the 98655 EAS SOTF add power by itself?
No. The 98655 is a control accessory, not a tuner. It does not flash your ECM or change the calibration on its own. All horsepower and torque gains come from your custom tuning files; the 98655 simply gives you cleaner, on-screen control over those files while driving.
Can I still use my existing analog SOTF switch with this kit?
In most setups you will remove or bypass the analog SOTF switch and let the Edge Insight/98655 combination handle tune selection. Running both in parallel can cause incorrect voltages at the ECM. Follow your tuner’s wiring instructions and choose one control method only – the 98655 is designed to replace the old-style switch.
INSTALLATION NOTES
- Always disconnect the batteries and follow standard electrical safety practices.
- Route the harness away from exhaust components, moving steering parts, and sharp edges.
- Double-check ECM pin locations against your tuner and Edge documentation before final assembly.
- Verify tune position changes on the Insight screen and confirm voltage readings if your tuner requests it.
