Due to a suspension lift the u-joint angles increases. After approximately 5 degrees of angle on a u-joint, vibrations begin to be noticeable. The higher the angle the higher the vibrations. All of the Driveshaftsuperstore kits effectively reduce the angles close to stock without reducing your lift thus, eliminating the vibrations. The kits vary in application based on the vehicle use.

The Options that are offered for the following kits are HIGH ANGLE, AND LONG SPLINES for an additional charge.

Also it is important to note that the Driveshaftsuperstore offers several high angle CVs that can be used on any of the drive shafts that come with the kits. How do you know which one to choose depends on the use of the vehicle. Daily drivers normally will have to have performance CVs that are made very precise and  precision balanced. On the other hand, totally off road vehicle can use the competition CVs which are bigger and have high strength u-joints and components (Bad Boy Jr and the Bad Boy 80). In many case our customers need both performance and strength in the off road and we use the PERF 45 degree CV to handle such needs. These CV are listed below.

1. Automotive 1310 half ton, 1330 three quarter ton, 1350 one ton with high angle and long spline options.

2. The PERF (performance) CV  2 ton CV 45 degrees 3000 ft-lbs to be used on angles of above 25 degrees on a daily driver. U-joints are bigger than 1410s but in only a 5" diameter package that fits all trucks.

3. The Bad Boy Jr    2-ton CV 60 degrees for competition (non-daily driver) vehicles like mud, rocks, etc. with long spline as an option.

4. The Bad Boy 2-ton CV 80 degrees for super high lift vehicles 15 and up and is also a competition CV not a daily driver.

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TIPS TO DISCOVERING YOUR NEEDS

Why the  BIG  Double Cardan CVs?

Torque rating decreases by the cosine of the angle to which the CV is applied. The higher the angle the lower the torque rating, so the CV must be BIGGER to compensate. The name of the game is "BIG" when it comes to high angle. BIGGER means higher torque rating.  At 30 degrees, there is nothing left for a 1310 or half ton CV at 1600 ft-lbs. It is at it's maximum angle and it means it will break. On the other hand, a BIG CV 2ton with 3000 ft-lbs torque rating at 5 degrees, is used to operate at 30 degrees. This is cruising for this CV because it still has a good torque rating and 15 to 30 degrees of flex remaining (depending on what BIG CV is used).

When do I need a CV?

When the angle of a single u-joint exceeds 5 degrees. Angles greater than this make the u-joint vibrate.

When do I need a high angle. Rules of thumb.

FRONT or REAR: Lifts between 4 inches higher or when the angle at the transfer case output exceeds 10 degrees or when the vehicle is built for lots of articulation where the CV may bind at full droop.

When do I need long travel. Rules of thumb.

Long Travel means twice the working travel available in the industy. We give you 7" instead of 3.5 or there abouts and the longest we offer is 25"

When the extension (or travel) exceeds 2 inches or when you have build you vehicle for high articulation or high movement of the differentials like for rock crawling and other sports. Especially if you have not installed traction bars to keep the axle from traveling straight downward.

How do I measure extension? Measure the distance between the transfer case and the differential at ride height, and then lift the body and let the wheels droop and measure again. The difference is your static extension, add .5 inches more for dynamic conditions and that should be your extension.

What is standard spline versus long spline? Answer: 3.5 inches total  versus 7 inch total travel. We have up to 26 inches of travel if you need it but it costs $40 for each additional 4 inches, just tell us on the comments how much travel you want beyond the 7 inches of the our first cut of travel.