2020 Honda Civic Si Remanufactured transmission CARBON SYNCHROS L15B Turbo Stage 3 350WHP



Product Info presents a remanufactured 2020 Civic Si 6 speed transmission. Fits only the 2020 Model year. If you are unsure, please send us your VIN after purchase.. This is our STAGE 3 box. The transmission has been completely torn down, all components inspected for wear and for excessive clearances. Reassembled to OEM specs, with all new bearings, seals and carbon synchros in all gears. Cryogenic and polish to all the gears. This adds 15% strength to all gears.  Transmissions are shipped dry, please add fluid upon installation. Please allow 14-27 business days for assembly
Terms of Purchase

Please read the entire listing. Buyer agrees to purchase item pictured. Product will be shipped with insurance included and signature required upon delivery.


ManualGearbox will provide a 6 month  warranty from the date of sale. A new clutch, new pilot bearing, new Honda MTF or equivalent transmission fluid and professional installation is required for warranty to be valid. This warranty covers the transmission from assembly defects or product defects. Damage due to abuse, lack of fluid or improper fluid voids the warranty. Racing in any form or opening the transmission up will also void the warranty.

Transmission Core

We would love to buy your old transmission core! Details will be sent after purchase.


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