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Questions and Answers for Chamberlain 7708CB Chain Drive Rail Extension Kit for 8 ft. Garage Doors

Internet #100431682

Model #7708CB

Store SKU #293784

7708CB Chain Drive Rail Extension Kit for 8 ft. Garage Doors
(73)Questions & Answers (31)
  • Fully open garage doors up to 8 ft. high
  • Quick-install rail system
  • Durable chain drive replacement belt
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Questions & Answers

31Questions
caret
Q:Does this extention kit work with craftsman door opener model 53920
by|Nov 15, 2023
1 Answer
Answer This Question

A:  Hello David. For Craftsman opener model 139.53920 we recommend rail extension kit model 6608CD.

by|Nov 17, 2023
    caret
    Q:will this chain and rail extension kit work with a Chamberlain Hd 400 D Model.
    by|Mar 5, 2021
    2 Answers
    Answer This Question

    A:  Chamberlain uses either a belt or chain drive. As long as the extension kit matches the drive type it will work. It added minimal complication to my installation.

    by|Mar 8, 2021

      A:  The HD400D uses a 7708CB extension rail kit. Thank you!

      by|May 18, 2021
        caret
        Q:I have a Chamberlin chain driven door opener on a eight foot door. The door only opens to 7’8” or so. I need the door to open further to allow my tractor to fit through. What do I need to do that or is it not possible?
        by|Dec 20, 2020
        2 Answers
        Answer This Question

        A:  Yes you will need an extension kit for the door to open to 8'. Make sure you get the right kit for your opener. There are two different 8' chain extension kits depending on what model opener you have.

        by|Dec 22, 2020

          A:  I've gained a few extra inches by releasing the door using the red pull. Maybe, if that doesn't give you enough, deflate your tractor tires.

          by|Dec 22, 2020
            caret
            Q:Will this work on a 1/2 horse power Craftsman Model 54985
            by|Nov 5, 2017
            2 Answers
            Answer This Question

            A:  Andy, Chamberlain rails are not interchangeable with Craftsman openers. Let me know if you have additional questions.

            by|May 5, 2023
              1 found this answer helpful

              A:  This chain extension will not work with Craftsman openers.

              by|May 5, 2023
                1 found this answer helpful
                caret
                Q:I need to replace a liftmaster 41A5021-1 can I use this unit with the chain of the old
                by|Jul 25, 2017
                1 Answer
                Answer This Question

                A:  The part number you gave is for a logic board. It has nothing to do with the chain or rail. The Chamberlain extension kit is not compatible with anything that Liftmaster makes.

                by|May 4, 2023
                  caret
                  Q:MY GARAGE DOOR IS 7'-4''. DO I NEED TO ORDER AN EXTENSION KIT?
                  by|Apr 26, 2017
                  2 Answers
                  Answer This Question

                  A:  You are good up to 7' 6" with this opener.

                  by|Dec 11, 2020
                    1 found this answer helpful

                    A:  No, the standard 7 foot rail will still work

                    by|May 4, 2023
                      caret
                      Q:Is the 8 foot extension in regards to the height of the door or how high it is off the ground when opened up?
                      by|Apr 1, 2017
                      2 Answers
                      Answer This Question

                      A:  Jrock8788 - The 8 foot extension is in regards to the height of the door.

                      by|May 4, 2023

                        A:  The full 8' opening. Even the manual door lift handle is out of the way.

                        by|May 4, 2023
                        caret
                        Q:This product works for the model 139.53990D craftsman 3/4?
                        by|Mar 21, 2017
                        1 Answer
                        Answer This Question

                        A:  LuisOscar - Yes, the extension kit will work for the Craftsman unit.

                        by|May 4, 2023
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