Engine & Transmission · Drivetrain & Powertrain
LS3-to-BMW Gearbox Adapter
GM LS3 / BMW M57N
A laser-cut steel bellhousing adapter mating an LS3 V8 to a BMW gearbox, paired with a hybrid steel-aluminum flywheel that runs the stock BMW clutch against an LS3 flexplate.
An LS3-to-BMW swap has no catalog adapter — the bellhousing needs to carry the gearbox correctly while staying light and easy to work on. The adapter is made from laser-cut steel, optimized for weight and for how easily the gearbox can be pulled for service later.
The flywheel solves a second mismatch: it's a hybrid steel-aluminum design that lets the stock BMW clutch run against the LS3's flex plate, balancing cost against weight instead of machining a full billet flywheel for a part that mostly needs to be round, true, and durable.
Highlights
- Laser-cut steel bellhousing adapter, optimized for weight and serviceability
- Hybrid steel-aluminum flywheel mates stock BMW clutch to LS3 flex plate
- Balances cost and weight instead of a full billet solution
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