Terms and disclaimer
Last updated November 9, 2026
What we provide
Transmission Tunes ("we") edits the transmission and driveability calibration in a file you supply, and returns the edited file to you electronically. We do not sell hardware, write to any vehicle, or provide repair services. You read and write your own vehicle with your own HP Tuners interface and license.
Your responsibilities
- You own the vehicle or have the owner's permission to modify it.
- You keep a copy of the stock file. We return it with every order, but it's yours to keep.
- You are responsible for flashing the file correctly, resetting adapts, and driving the vehicle sensibly while evaluating it.
- You are responsible for making sure the vehicle complies with all federal, state and local laws where it is used, including emissions laws. We only change transmission and driveability tables and we do not alter or disable emissions equipment or diagnostics.
Risk and warranty
Changing a factory calibration is done at your request and at your own risk. Firmer shifts, converter lockup changes and altered shift points change how the drivetrain is loaded. We calibrate within what the transmission's own controller allows and we decline requests we believe would damage a transmission, but we cannot see or drive your vehicle and we make no warranty that any file is suitable for your vehicle or use. Calibration changes may affect your manufacturer's warranty. To the fullest extent the law allows, our liability for any claim is limited to the amount you paid for the order, and we are not liable for indirect or consequential damages including damage to the vehicle, towing, loss of use or lost income.
Turnaround
Orders paid between 8 am and 6 pm Central, Monday through Saturday, are delivered within 60 minutes of payment. Orders outside those hours are delivered within the first business hour of the next business day. If we miss the promised time, we refund 20% of the order. If we can't complete an order — unsupported file, unreadable file, a request we won't do — we refund it in full.
Revisions and refunds
Each order includes one revision within 30 days of delivery. Additional revisions are priced as listed. Delivered files are digital goods and are not refundable; our guarantee is the revision.
Your file and data
Files are stored for 90 days after your last order or revision and then deleted. They are used only for your vehicle and are never shared or sold. See the privacy page.
Intellectual property
The calibration changes we make are licensed to you for use on the vehicle identified by the file. You may not resell or redistribute the file.
Payments
Payments are processed by Stripe. We never see or store your card number. Charges appear as TRANSMISSIONTUNES on your statement.