Dynojet 248x: Installation Guide - Manual (Page 48)

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9. Tighten the tie-down straps evenly making sure that the drive
wheels remain centered on the drum.
CAUTION: The tie-down straps should always be connected to
the vehicle’s solid axle or the suspension control arms. Factory
tie-down hooks connected to the vehicle’s frame may be used on
the end opposite the drive wheels (for example: the front end of a
rear driven vehicle).
10. Release the brake on the vehicle and the dyno.
11. Start the vehicle and put the transmission into first gear or
drive.
12. Press the accelerator pedal so the drums begin turning slowly.
While the drums are slowly turning, get a feel for the stability
of the vehicle.
13. Check all the straps and ensure the vehicle is tracking straight
on the dyno.