Easy
15-30 minutes
It is an authentic manufacturer-sourced component which is specially designed for DeWALT power tools. The purpose of this transmission assembly is to help transfer the drive motion to the chuck. If the original item is damaged or is missing, this will provide an identical replacement. This assembly is made of high-quality metal and is sold as an individual item. Check the diagrams for your model to ensure the correct replacement procedure. A screwdriver and a wrench set might be needed to perform this repair.
Transmission Assy. N279940
OEM part for: DeWALT
Part Number: N279940
$41.68
In Stock
Ships within 1 business day 
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Frequently Purchased Together ?
Compatibility
This part will fit the following 3 machines
DeWALT
DCD771C2 (Type 1) 20V Compact Drill Driver Kit View Diagrams & Manuals
DCD771 (Type 1) 20V Max Cordless Compact Drill/Driver View Diagrams & Manuals
DCD771C2 (Type 2) 20v Drill/Driver Power Tool View Diagrams & Manuals
This item works with the following types of products:
- Drill Parts
- Cordless Drill Parts
Customer Part Reviews ?
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Exact part that I needed/ordered
It was the complete transmission assembly that I needed and installed easly after watching a video on line. Arrived in several days as stated when ordered, completely satisfied.
Guest -
December 29, 2022
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Questions & Answers ?
Our customer Service team is at the ready daily to answer your part and product questions.
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Does this fit my product?Questions & Answers for Transmission Assy.
What is the standard thread type and dimensions on this transmission assembly?
Toby
for model number DCD771
asked on 2022-11-19
Hello Toby, diameter is approximately 2-1/4". However, we do not find the thread type. For more specialized assistance or to speak with someone about this, we would suggest calling the manufacturer of the unit directly. Good luck with your repair.
eReplacementParts Team November 19, 2022
Customer Repair Instructions ?
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part.
drill transmission was broken (into multiple pieces!)
Kent - December 2, 2018
👍 1 of 1 people found this instruction helpful
Tool Type
Cordless Drill
Difficulty
Easy
Time
15-30 minutes
Tools Used
Screwdriver, powerdrive (six point star) tips
Parts Used
Removed screws from case.
Removed screw left handed threads!) from inside chuck
Separated case halves
Pulled motor/trans/chuck assy loose, no need to mess with wiring.
Separated trans/chuck from motor.
Put trans in vise, used pipe wrench to remove chuck.
Put chuck on new trans.
Transferred 1-2 shifter.
Put trans/chuck on motor.
Worked to get everything lined up properly, reassembled case halves.
Removed screw left handed threads!) from inside chuck
Separated case halves
Pulled motor/trans/chuck assy loose, no need to mess with wiring.
Separated trans/chuck from motor.
Put trans in vise, used pipe wrench to remove chuck.
Put chuck on new trans.
Transferred 1-2 shifter.
Put trans/chuck on motor.
Worked to get everything lined up properly, reassembled case halves.
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Motor and transmission broke
Prentice - September 17, 2018
Tool Type
Cordless Drill
Difficulty
Easy
Time
Less than 15 minutes
Tools Used
Screwdriver, Soldering iron
Split case replaced motor and transmission soldered wires and reassembled
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Our product descriptions are a combination of data sourced directly from the manufacturers who made your product as well as content researched and curated by our content & customer service teams. This content is edited and reviewed internally before being made public to customers.
Our customer service team are at the ready daily to answer your part and product questions. We have a dedicated staff with decades of collective experience in helping customers just like you purchase parts to repair their products.
All our part reviews are solicited directly from other customers who have purchased this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
All our customer repair instructions are solicited directly from other customers just like you who have purchased and replaced this exact part. While we moderate these reviews for profanity, offensive language or personally identifiable information, these reviews are posted exactly as submitted and no alterations are made by our team.
Based on data from past customer purchasing behaviors, these parts are most commonly purchased together along with the part you are viewing. These parts may be necessary or helpful to replace to complete your current repair.
All our installation videos are created and produced in collaboration with our in-house repair technician, Mark Sodja, who has helped millions of eReplacementParts customers over the last 13 years repair their products. Mark has years of experience in selling and repairing both commercial and residential products with a specialty in gas-powered equipment.
This data is collected from customers who submitted a repair instruction after replacing this exact part. Customers can rate how easy the repair was to complete and how long it took. We aggregate this data to provide a repair rating that allows customers to quickly determine the difficulty and time needed to perform their own repair.
