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Model # 8808CB

Internet # 100431683

Store SKU # 294733

8 ft. Belt-Drive Extension Kit

This item has been discontinued.
The Home Depot no longer carries this specific product.

$47.99 /each
  • Fully open garage doors up to 8 ft. high
  • Ultra-quite Whisper Drive replacement belt
  • Quick-install rail system




Model # 8808CB

Internet # 100431683

Store SKU # 294733

The Chamberlain 8 ft. Belt-Drive Extension Kit is compatible with Chamberlain's Whisper Drive and Whisper Drive Plus belt-drive garage door openers. It comes with a rail extension and replacement belt and can be used with garage doors up to 8 ft. high.

  • For use with garage doors up to 8 ft. high
  • Compatible with chamberlain whisper drive and whisper drive plus belt-drive models
  • Kit includes rail extension and replacement belt
  • Comes ready to install with complete instructions

Info & Guides

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Maximum garage door height (ft.) 
Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Rail extension length (in.) 
Brand/model/year compatibility 
Drive System 
Garage Door Part/Accessory Type 
Extension Kits 
Product Weight (lb.) 
4.8 lb 
Warranty / Certifications
Manufacturer Warranty 
1 year 


Rated 4.3 out of 5 by 24 reviewers.
Rated 5.0 out of 5.0 by Exceeded Expectations Replaced 9 yr old Chamberlain chain drive with new belt drive. Unit shipped early, I installed it by myself using the old Chamberlain mounts, took 1.5 hrs. New unit very easy to program and extremely quiet operation! Extremely pleased with the whole experience. One small complaint - Chamberlain should offer separate 7 ft and 8 ft units. The standard garage door is now 8 ft and forcing customers to purchase the 8 ft extension kit is a total waste of resources (the included 7 ft bar and belt goes into the garbage) Just charge more and offer a standard 8 ft unit. May 12, 2015
Rated 4.0 out of 5.0 by Keep my garage door quiet Changing from chain to belt, my garage door becomes very quiet. It's not even noticeable when it's open and close. A nice investment for me. October 20, 2015
Rated 3.0 out of 5.0 by Garage door repair Unfortunetly I had to return this item because it was not long enough for our doors. I couldn't find one at HD that was long enough. October 13, 2015
Rated 5.0 out of 5.0 by Quietest Garage Dooe Opener If you want quiet this the opener to buy. The wireless gateway is a great feature, we can open and close the door from our phone. We also purchased a light switch add on that controls house lighting from our phone. Love this opener October 6, 2015
Rated 5.0 out of 5.0 by Must Purchase for 8' Tall Door Yes, you MUST purchase this kit if you have a garage door that is 8' tall. Be sure to use the tensioner spring enclosed in this kit because the belt is longer and needs increased tension to keep it from sagging on open and close cycles. The instructions are ample and especially easy to follow since most are installing a new opener at the same time. It would be nice if there was an option to purchase an opener specifically for 8' doors so you don't end up with an extra belt an track parts but until then this is the only option. March 25, 2015
Rated 1.0 out of 5.0 by Did NOT Fit Spent all morning prepping the garage and laying out the pieces. Turns out, I bought a newer version of the garage door opener, unfortunately, the extension kit is not compatible and is from an older version. Turns out, home depot does not sell the new version. Its a shame that Home Depot does not confirm these sort of things. This wasn't an isolated incident as I went to another home depot, bought a another extension kit, and the issue is the same. The pieces will not fit. It took me a while to explain this to chamberlain...they confirmed the incompatibility...and now I get to way 2-3 weeks for a new part to come in. What a waste of a day! Buyer Beware. December 18, 2014
Rated 4.0 out of 5.0 by Easy to install, works great. Works great for a 8' door. easy to install. well made product. July 29, 2015
Rated 5.0 out of 5.0 by Works perfect for my 8' door The 8' extension kit worked perfectly for my opener, but is definitely overpriced at $49.99. It should be much closer to half that price!! May 26, 2015
  • 2015-11-22 T10:51:59.206-06:00
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