Design Spec Sheet Page 3

In order to build a driveshaft specifically for your needs, we would like to know as much about your vehicle as possible. A driveshaft needs to be adequate for the tourque and RPM requirements and yet, be lightweight as practical. Below are some questions we would like you to answer to the best of your ability. Some of them may not apply to your application and there may be some we ask when you call that aren't on here. After all, this is just a guide!

TYPE OF VEHICLE______________________ INTENDED USE___________________________
VEHICLE WEIGHT(VW)__________________ ENGINE DISPLACEMENT__________________
APPROX. HP.__________________ APPROX. TORQUE (T)__________________
TRANSMISSION______________________ TRANS. GEAR RATIO IN 1st GEAR (Tr)_________
TRANS. BRAKE?___________ REAREND, MAKE & MODEL______________________
RATIO OF REAREND (GR)___________________ DO YOU PLAN ON USING SLICKS?______

We now have enough information for 2 simplified equations. The first on is called "How Much Power is Available". (If you are a mechanical engineer, I apologize for the generalizations made here!) (U-Joint and Tube ratings use torque. NOT HP. Horsepower is simply an expression of torque in a given time. If you think you know the horsepower, but have no idea of torque, do this equation first; (T) = HP x 5252/RPM. Example: 400hp.@6000rpm., the equation would be 400 x 5252/6000 = 350 lb. ft. of Torque)

From the information you gave above, the power available at the back of the Trans. is;

The other equation is called "How Much Power Can Be Delivered To The Ground". This is the more important of the 2, and starts with this:

Now, take the answer, and multiply by a variable to adjust for traction and weight transfer.
For street tires, use: (VW)/(GR) x .6
For 8"-10.5" Slicks use: (VW)/(GR) x 1
For Really Big Slicks (example, 16.00x32), use : (VW)/(GR) x 1.5 (or even 2)

Play with these for awhile. You should figure out that the equation with the smaller answer is closest to what your needs are. If the available power is more than can be put to the ground, the result is either wheelspin or wheelies.

U-JOINT SERIES	CONT. TORQUE	SHORT DURATION TORQUE	MIN. ELASTIC LIMIT
1310 & 7260	400	800	1,600
1330 3R & 7290	550	1000	1,875
1350	680	1240	2,260

Definitions; Continuous Torque is a reference only, used to determine life expectancy over a given time.

Short Duration Torque represents the u-joints ability to withstand momentary loading and still give long life.

Minimum Elastic Limit represents the maximum torque load the u-joint can transmit before failure.

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