Chamberlain 7708CB-P Chain Drive Rail Extension Kit for 8 Foot High Garage Doors

Easy addon if your garage is an 8 FOOT GARAGE. Parts inside this box fit perfect to the parts in the garage door box. It is a SHAME that I had to throw away the chain that came with the garage door opener. Seems like a waste. Not a friendly green option. CHAMBERLAIN should have a free return option and maybe even a small credit. No where is it obvious that you need this kit if you garage is an 8 foot garage door. Stumbled onto it when reading the comments from previous Amazonians who purchased the garage door itself.

The extension worked as needed. Easy to install and include the longer chain needed. This was available on Amazon when the same item was on back order at Lowes

I have to wonder why the company does not sell a 7 ft. model and an 8 ft. model. Lots of extra parts were purchased just to get the extension. Anyone need a brand new in the box chain for a seven-foot door? Just a waste of resources.

Thank you

easy to install. worked great.

I called Chamberlain to ask about a replacement when my previous Lift Master/Chamberlain garage door opener failed after 20 years of service. They recommended this opener rather than a cheaper model that, on paper, should have worked. Chamberlain's customer service was excellent, by the way. This opener went up and worked like a champ first time with only one change to my existing mount points. I had to purchase a length extension because the length of the opener out of the box was too short, even though I was pretty careful to measure everything and compare to what the manufacturer's specs indicated were necessary. After I got the extension added to the opener, which was almost too easy, I moved my mounting point back about three inches from the previous location. I am very well satisfied with this product.

...but this was a EASY, CHEAP fix. I bought a opener that was for a 7' door and I had an 8". The spring snapped and the garage door repair dude told me that he could install this fix for $125/door. I took a leap of faith and this was what I needed.

I bought this in hopes it would work with my Craftsman 1/2 hp Model: 54985 . Turns out it fit fine. It was the exact same tube and chain type. I used it for a custom vertical mount to open roll up doors. Worked great. Going to order a second because its so inexpensive, to have as a spare chain.

Buen producto

I followed the installation instructions, everything fit and worked perfectly. Don’t forget to bend the stop tab up before assembly.

Turned the 7' garage opener from a previous place into an 8 footer to fit the new house in a matter of minutes. Includes everything you need and nothing you don't! Remove the chain/cable (but DON'T DISCARD THE END LINKS AND CLIPS), remove the old end tube, slip in the new one, swap the cable roller and bolt from the old tube, run the (supplied) entirely new chain and cable assembly (using the old end links) and voilà!

Me sorprendió la calidad de los materiales, me ahorre una buena lana comprándolo por aquí, su funcionamiento es silencioso, se puede manejar desde el celular, lo puse en un portón corredizo de madera con metal de casi 4 mts tenia temor de que se forzara el motor por lo pesado pero no, de echo en la aplicación del cel te informa si se esta forzando o no y hace un análisis de su funcionamiento.

Bought a chamberlain garage door opener but required the extension for our larger door. Works perfectly. Easy to install!