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Q: will this fit model 139.53990D craftsman opener

Yes, that is the correct gear. Thanks Tim

Q: Is there a difference between the gears for Sears and the regular Chamberlain models?

No they seem to be made by the same place.

Q: I just replaced the gear at the end of april and it just broke at the end of september. i know i did something wrong, but any ideas as to what i did?

The earlier responses are the suggestions I would give not knowing how the gears were installed. If you followed the instructions, you shouldn't have had any problems..

Q: Will this fit a Liftmaster 3850?

I would say that it fits that opener, based on the assembly diagram I saw for the Liftmaster 3850 and the similarity of that to the belt drive openers I have (Craftsman brand is what I have).

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Specifications

Brand	LiftMaster
Product Dimensions	2.75"L x 0.5"W
Finish Type	Unfinished
Mounting Type	Door Mount
Hole Count	1
Unit Count	2 Count
Manufacturer	LiftMaster
Part Number	CECOMINOD019206
Item Weight	2.08 ounces
Item model number	CECOMINOD019206
Is Discontinued By Manufacturer	No
Size	2 3/4" x 1/2"
Color	White
Finish	Unfinished
Item Package Quantity	1
Number Of Pieces	2
Cutting Diameter	2.75 Inches
Batteries Included?	No
Batteries Required?	No
Assembled Diameter	2.75 Inches

Have a Question? See What Others Asked

will this fit model 139.53990D craftsman opener

Is there a difference between the gears for Sears and the regular Chamberlain models?

I just replaced the gear at the end of april and it just broke at the end of september. i know i did something wrong, but any ideas as to what i did?

Will this fit a Liftmaster 3850?

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202.51 DT

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LiftMaster 2 Pack - Drive Gear for Sears Crafsman Chamberlai

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