A used transmission or engine comes out of another vehicle as-is; a rebuilt unit has had its failed and worn parts replaced, usually by a local shop; and a remanufactured unit has been completely disassembled, cleaned, inspected, machined where needed and reassembled to a consistent standard, typically with known weak points updated and the finished unit tested. Price usually rises in that order, and so does the predictability of what you get.
Used vs rebuilt vs remanufactured
| Factor | Used | Rebuilt | Remanufactured |
|---|---|---|---|
| Source | Pulled from a salvage vehicle | Your unit or a core, repaired | A core, fully reprocessed |
| Parts replaced | None | Failed and worn parts | All wear parts, with updates |
| Consistency | Unknown history | Depends on the builder | Built to a set process |
| Testing | Often none | Varies | Usually tested before shipping |
| Cost | Lowest | Middle | Highest of the three |
Is a rebuilt transmission as good as new?
A well-rebuilt transmission from a skilled builder, with the known weak points addressed, can last as long as the original. Quality varies, though, so ask what was replaced, whether the torque converter and cooler were addressed and what the coverage terms are. A rebuild that only fixes the failed part can leave other worn parts in place; see transmission rebuild vs replacement.
Used or rebuilt?
A used unit costs the least up front, but its mileage and maintenance history are unknown, and the labor to install it is the same as for a rebuilt or remanufactured unit. If it fails, you pay that labor twice. That is why many owners prefer a rebuilt or remanufactured unit when they plan to keep the vehicle.
Rebuilt vs remanufactured engine
The same logic applies to engines: a rebuild restores your engine by replacing worn parts, while a remanufactured engine is reprocessed to a standard specification, often with machining and new major parts throughout. Short blocks and long blocks are common forms; see short block vs long block and how long engines last.
Questions to ask any seller
- What exactly was replaced or machined, and to what standard?
- Was the unit tested, and how?
- Is a torque converter included (for transmissions)?
- Is there a core charge, and what are the coverage and return terms?
Our engines and transmissions
Each listing states its series and condition. Our remanufactured engines page collects engines marked as remanufactured or refurbished, and our transmissions page lists units by code with what each includes; see also engine replacement cost and transmission replacement cost.
More guides: how long remanufactured engines last · rebuilt vs used transmission · used vs rebuilt engines · how long a rebuilt transmission lasts.
Shipping is a flat $80.00 per order to US addresses, with 15-day free returns. Questions? Ask a parts specialist.