User's Manual

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Ext. 2

Checking Driveline Angles

1. After the RoadTamer kit is installed, the following

conditions must be true for the driveline angles, both

at unloaded and fully loaded ride heights:

a. Condition #1: The operating angle at any individual

joint must be between 0.1° and 4°. The preferred

maximum angle is 2°.

b. Condition #2: When added together, the

operating angles throughout the driveline MUST

cancel. The operating angles at either end of a shaft

should be within 1° of each other or at least satisfy

the following formula in order to provide adequate

cancellation (Figure 21).

Figure 21

Checking Angles in Various Conditions

2. Wedge shims may be placed between the beams

and axle to correct driveline angles that fall

outside this requirement. Re-check all driveline

angles after installing the shims.

3. A minimum operating angle of 0.1° at each

universal joint is required to prevent dents from

forming on the bearing surfaces.

1. Measure and record the driveline angles in each of

the following conditions for later comparison:

a. The chassis as ﬁ rst received (note that the driveline

angles may not conform exactly to this bulletin in this

incomplete condition).

b. The completed vehicle, unloaded.

SIDE VIEW

angle-a

angle-b

DRIVESHAFT

angle-c

For a 3-joint, 2-shaft driveline:

(as shown above)

a - b + c 4.0˚

22 2

c. The completed vehicle loaded to Gross Vehicle

Weight Rating (GVWR) with maximum front

Gross Axle Weight Requirement (GAWR).

d. The completed vehicle loaded to GVWR with

maximum rear GAWR.