VIN
The 17-character vehicle identification number establishes manufacturer, vehicle line, model year, plant, and configuration data used by fitment catalogs.
- Send all 17 characters
- Photograph the dash or label
- Do not post a full VIN publicly
Transmission Identification
How to identify the correct transmission before ordering a replacement.
Year, make, and model are a starting point—not always a fitment decision. The VIN, unit tag, build codes, drivetrain, production date, connectors, calibration, and hardware must agree.
Buyer Education
Why visually similar transmissions can be incompatible.
Manufacturers can use more than one transmission within the same model year and body style. Engine, drive type, axle ratio, gross-weight package, emissions configuration, production split, electronic strategy, and factory options can change the required unit.
A case may bolt to the engine but still have a different internal ratio, output, speed sensor, connector, valve body, control module, calibration, cooler fitting, mount, extension housing, or transfer-case interface. Those differences can cause a no-start, no-communication, incorrect shifts, installation delays, or a nonreturnable special-order problem.
Start with the complete VIN and then confirm secondary identifiers when requested. Do not guess a missing tag from an internet photograph or rely on a marketplace compatibility list without supplier verification.
What Matters
The identifiers that narrow a transmission application.
Not every vehicle uses every identifier, but the correct combination should be preserved before ordering.
Transmission Tag
A barcode label, metal tag, etched code, or case stamp can identify family, build code, serial number, calibration, and production information.
- Clean gently—do not grind
- Photograph straight and close
- Record every line and character
RPO or Build Codes
Option labels, build sheets, service data, or manufacturer systems may list transmission, axle, transfer-case, towing, or calibration codes.
- GM RPO labels or digital build data
- Manufacturer build sheets
- Fleet or commercial option packages
Engine & Drivetrain
Engine size or code, two- or four-wheel drive, transfer case, axle, and vehicle weight package affect torque capacity, case, output, and calibration.
- Exact engine code
- 2WD, AWD, or 4WD
- GVWR, towing, and commercial configuration
Production Details
Model-year changes can occur midyear. Door-label build date, transmission build date, plant, and serial break may determine the correct version.
- Month and year built
- Early or late production
- Supersession or update history
Physical & Electronic Match
Pan shape is only a clue. Compare bellhousing, mounting, output, connectors, sensors, cooler fittings, valve body, modules, and programming requirements.
- Connector count and keying
- Output and transfer-case pattern
- Module and strategy requirements
A Clear Path
Build a fitment packet before requesting price.
Complete information gets a more reliable answer faster and creates a record if the application is questioned later.
Capture Vehicle Data
Record VIN, year, make, model, engine, drive type, build date, mileage, and intended use.
Capture Unit Data
Photograph and transcribe tag, barcode, stamp, connectors, pan, case, output, cooler fittings, and transfer-case interface.
Check Service Information
Use manufacturer or supplier catalog data to reconcile production splits, codes, calibration, and superseded part numbers.
Get Written Confirmation
Make the quote identify the verified application and preserve the VIN, tag photographs, and supplier response with the order.
Common Questions
Details to confirm before ordering.
These answers are educational. The vehicle, written quote, supplier policy, carrier terms, and unit-specific warranty control the purchase.
Can the VIN identify the transmission by itself?
Sometimes, but not always. The VIN narrows the vehicle configuration; transmission tags, production splits, build codes, calibration, and physical details may still be required.
Where is the transmission identification tag?
Location varies by family. It may be on the case side, bellhousing, pan rail, extension housing, top of the case, or an electronic component. Service information can identify the correct location.
Can I identify a transmission by pan shape?
Pan shape can narrow the family, but it is not reliable enough for final ordering because related units can share cases or pans while using different electronics, ratios, outputs, or calibrations.
What if the tag is missing or unreadable?
Provide VIN and build data plus clear photographs of the case, connectors, pan, bellhousing, output, sensors, casting numbers, and any remaining stamps. Additional measurement or teardown may be needed.
Does two-wheel drive versus four-wheel drive matter?
Yes. Output shafts, extension housings, transfer-case adapters, sensors, and calibration can differ. AWD can be a separate application again.
Why does the installer need the quote before removing the old unit?
It preserves accessible identification, allows supporting parts and programming to be planned, and reduces the chance that the vehicle occupies a lift while a wrong or unavailable unit is corrected.
Ready for a Verified Quote?
Start with the VIN and delivery details.
Send the full VIN, mileage, drivetrain, unit tag or build codes when available, delivery ZIP code and delivery type. Integrity will confirm supported fitment, current options, freight, core, and written warranty terms.