Torsion Springs

Measure the length of the unwound spring.
Do not measure the end caps of the springs. If your garage door has
left and right wound springs, measure both, as they may differ.

Next, Measure the Inside Diameter (ID) of the spring. 

Next, Determine the Wire Size.
Measure the length of 10 coils of the spring.
Example: 10 coils measures 2 1/4" = .225 wire size. (See chart below for examples)

If you currently have 2 springs on your garage door, you should replace both springs at the same time.

About City:

Grand Prairie, TX 75050

Grand Prairie is a city in Dallas, Ellis, and Tarrant counties in the U.S. state of Texas and is a part of the Mid-Cities region in the Dallas–Fort Worth metroplex. Grand Prairie is a suburb of both Dallas and Fort Worth and had a population of 175,396 at the 2010 census
The city of Grand Prairie was first established as Dechman by Alexander McRae Dechman in 1863. Dechman, who was from Birdville, learned that he could trade his oxen and wagons for land in Dallas County. In 1863, Dechman bought 239.5 acres (96.9 ha) of land on the eastern side of the Trinity River and 100 acres (40 ha) of timber land on the west side of the river for a broken-down wagon, oxen team and US$200 in Confederate money. He tried to establish a home on the property, but ran into difficulties, so he returned to his family in Birdville before joining in the Civil War. In 1867 he filed a town plat consisting of 50 acres (20 ha) with Dallas County.

After the war, he returned to Birdville for two years before selling that farm in 1867 and moving to Houston, where yellow fever broke out, causing the family to settle in Bryan. In 1876, Dechman traded half his "prairie" property to the T&P Railroad to ensure the railroad came through the town. The railroad named the depot "Dechman", prompting its namesake to relocate his home from Bryan to Dechman. His son Alexander had been living in Dechman and operating a trading post and farm. The first church in the area was the Good Hope Cumberland Sabbath School, established in 1870 by Rev. Andrew Hayter. The church was later renamed West Fork United Presbyterian Church and remains an active church.

The first U.S. post office opened in 1877 under the name Deckman rather than "Dechman", because the United States Postal Service couldn't read the writing on the form completed to open the post office. Later that same year, after the Postal Service had adopted the "Deckman" name, confusion resulted from the T&P Railroad designation Grand Prairie. This name was based on maps drawn from around 1850 through 1858 that labeled the area between Dallas and Fort Worth "the grand prairie of Texas". In order to alleviate the confusion, the Postal Service named the post office Grand Prairie.

The town of Grand Prairie was eventually incorporated as a city in 1909. During World War II and since, Grand Prairie has had a long history with the defense and aviation industry. While the present-day Vought plant on Jefferson Avenue is part of a small strip within the Dallas city limits, it was originally in Grand Prairie. During WWII it was a North American Aviation plant that produced the P-51C and K Mustang variants. After the war, Vought Aircraft took over the plant. This later became Ling Temco Vought and then eventually returned to the Vought moniker. The plant was the production site for the F-8 Crusader and the A-7 Corsair II aircraft of the 1950-1989 time period. The Missile and Space division of LTV produced missiles such as the Scout and MLRS. This division was eventually sold to Lockheed Martin, which continues to operate in Grand Prairie. Grand Prairie was also the North American headquarters for Aérospatiale Helicopter. This company eventually became American Eurocopter, a division of EADS North America.

In 1953, the mayor and city council of Grand Prairie went on a "land grab", and attempted to annex nearly 70 square miles of then-unincorporated and largely undeveloped land in southern Dallas and Tarrant counties. Vehement debate ensued, and the legal pressure from cities like Arlington, Duncanville and Irving wound up overturning the unprecedented annexation attempt.