A poorly calibrated factory transmission tune doesn't just shift badly — it self-destructs. High line pressure spikes, erratic TCC cycling, and improper shift timing put real stress on clutch packs and your torque converter every single drive.
We specialize in GM transmission tuning for reliability and performance — done right using HP Tuners and real scanner data from your specific vehicle.
Firm, consistent shifts without harshness. We calibrate shift points and pressures based on your vehicle's weight, tire size, final drive ratio, and your driving style — not a generic tune file.
The factory TCC calibration is a leading cause of torque converter failure. We correct it to reduce heat and slippage, protecting your TCC and extending its service life significantly.
Active Fuel Management and Displacement on Demand cause lifter failure and add wear on the transmission and TCC. Disabling it extends the service life of your engine and reduces shudder and drivetrain stress.
A full custom calibration built for your vehicle and driving style. Covers shift points, shift pressures, TCC lockup strategy, and AFM/DOD delete.
Will feel better than factory — assuming no mechanical issues — and will prolong the service life of your engine and transmission.
Guaranteed to pass OBD2 state inspection.
Already tuned with us? As your driving style evolves, your mods change, or you want something tightened up — we revise your calibration based on fresh datalogs. Fast turnaround, same quality.
Fill out your info below. HP Tuners credit costs are calculated based on your vehicle and passed through at cost — no markup.
Submit your quote and Rob will reach out within 24 hours to confirm details, answer questions, and arrange payment. No charges until we've spoken and you're ready to proceed.
Use the configurator to build your quote, then submit it. Rob follows up within 24 hours to confirm details and arrange payment.
Rent an MPVI4 from us or use your own. Rentals ship within 1 business day with setup instructions.
Plug the MPVI4 into your OBD-II port, do a vehicle read, and email us your baseline datalog file.
We build your custom calibration and email it to you. You load it onto your vehicle using the MPVI4 — we walk you through every step.
Send us a datalog after a few drives. We refine until shift quality is exactly where it needs to be.
The HP Tuners MPVI4 is the industry-standard tool for GM ECM and TCM calibration. We ship it to you ready to use. A $350 fully refundable deposit is required — covering replacement cost in the event of loss or damage. You arrange return shipping via any carrier of your choice.
Add Rental in ConfiguratorIn-person tuning includes a base tune, AFM/DOD delete, and up to 1 hour of real-time street tuning. Select "Local / In-Person" in the configurator above to get your quote.
Bring your vehicle to our location in Cumberland, RI. Real-time logging during the session gives us the most accurate calibration possible. Scheduling required — contact us to book a slot.
We travel to your location across MA, CT, NH, VT, ME, and RI. A travel fee applies based on distance from Cumberland, RI. Contact us for a travel quote before booking.
We tune the 4L60E, 4L80E, 6L80, 8L90, and 10L80 — common GM automatics found in trucks, SUVs, and performance vehicles from the late 1990s through present day.
HP Tuners uses a credit system to license your vehicle's ECM and TCM for tuning. It's a one-time cost per VIN — once licensed, no future credit charge. We pass this through at cost with zero markup.
We build your calibration remotely using your baseline datalog. The finished tune file is emailed directly to you — you load it onto your vehicle using the MPVI4 device. We walk you through every step of the process.
We ship you the MPVI4 device. A $350 fully refundable deposit is required. 1-week rental is $50, 2-week is $100 (2nd week deducted from deposit). You arrange return shipping. If late, the deposit decreases $50/week for 8 weeks — after that it's considered purchased.
The factory GM calibration is built for fuel economy — not reliability or driving feel. A proper tune corrects shift timing and pressures, eliminates TCC shudder, protects the torque converter, and disables AFM/DOD. All of this extends the life of your engine and transmission.
Yes. Our tunes are guaranteed to pass OBD2 state inspection. We calibrate properly — no codes masked or cleared.
In-person tuning includes a base transmission tune, AFM/DOD delete, and up to 1 hour of real-time street tuning. You can come to us in Cumberland, RI or we travel to you in New England for a travel fee.
Active Fuel Management and Displacement on Demand switch the engine between 4 and 8 cylinders to save fuel. They are well-documented causes of lifter failure, increased shudder, and added transmission wear. We disable it cleanly in the ECM — no hardware changes required.