What the finished unit has passed
A rebuilt automatic transmission has been fully disassembled, screened, cleaned, renewed, bench tested, reassembled, and dyno tested. Screening removed parts showing wear, deformation, fatigue, or out-of-tolerance measurements. Cleaning used repeated ultrasonic cycles with dedicated cleaning agents, followed by a second cleanliness check. High-wear parts were replaced, and upgrades were applied to known weak points in the original design. Pressing used 20-ton hydraulic equipment to the original pressure and depth standards, and worn valve bores were repaired with sleeves. Solenoids, sensors, and valve body assemblies were bench tested for oil flow, pressure stability, switching response, and sealing. The housing was refurbished and its sealing surfaces prepared. Reassembly followed the original assembly method, torque parameters, and lubrication rules. The finished unit was then tested under full load on a dyno bench, covering main line oil pressure, clutch engagement, torque output, shift smoothness, working temperature, hydraulic condition, abnormal noise, and sealing, and its test data and quality inspection record were retained.
Checking a rebuilt automatic unit on delivery
On delivery, check the model code first, then the appearance and the sealing, and then the accompanying record for the unit. The model code check confirms fitment. The appearance and sealing check confirms that the unit arrived in the condition described and that its seals are intact. The record check confirms that the unit itself, not merely a batch, passed the full-load dyno inspection. Keep the packing until these checks are complete, because packing is part of the evidence of how the unit travelled, and a buyer who discards it before checking loses the ability to show the condition on arrival. If any check fails, raise it promptly with the order details and the record, rather than installing the unit and raising the issue afterwards.
Automatic units and continuously variable units
Automatic transmissions and continuously variable transmissions are different categories, and this site keeps them separate. The rebuilt automatic pages describe automatic units, while the remanufactured continuously variable page describes continuously variable units purely as a remanufacturing service category. A buyer should not transfer the scope, the bench testing detail, or the packing from one category to the other without confirming it for the exact model code. Please confirm the category and the model code in writing before placing an order, and treat any quotation that mixes the two categories as a point to clarify rather than a detail to overlook.
Buying for workshops and distributors
Workshop buyers typically need a unit that can be fitted with confidence and supported if a question arises after fitting. Distributor buyers additionally need consistency across a batch: identical scope, identical test coverage, and individual records for each unit. The documented process supports both needs, because every finished unit is dyno tested with no sampling, and test data and a quality inspection record are retained for each unit. Distributor buyers should still confirm the batch arrangements in writing: how units are identified, how records are supplied, and how packing is organised for the shipment. Please confirm the minimum order quantity and the lead time before placing an order.
Confirm before you order
- Please confirm the transmission model code, the category, and the quantity in writing.
- Please confirm the minimum order quantity and the lead time before placing an order.
- Please confirm what test data and quality inspection records will accompany each unit.
- Please confirm the warranty terms, including the start point and the claim route, before payment.
- Please confirm the packing, the trade terms, and the payment terms before payment.
Questions buyers ask
How does a rebuilt automatic unit differ from a repaired automatic unit?
A repair addresses a reported fault. A rebuild, as described here, takes the whole unit through teardown, screening, cleaning, renewal, bench testing, reassembly, and a full-load dyno inspection. The difference is the completeness of the sequence and the whole-unit test.
Should I keep the test record?
Yes. Keep the test data and quality inspection record with the order paperwork. The record identifies what was tested for that unit and is the reference if a question arises after fitting.
What if the model code on delivery differs from the order?
Do not fit the unit. Raise the mismatch promptly with the order and delivery details, and keep the packing until the matter is resolved.
Related pages
Remanufactured automatic transmission explains the process for automatic units. Remanufactured CVT transmission covers the continuously variable service category. Transmission dyno testing explains the final inspection.