Speedtech 67-69 Camaro Tunnel Cover - Manual (Page 3)

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2. Once the cut lines are laid out, take the necessary safety
precautions and carefully cut out the rectangular portion of the tunnel
within your marks. Test fit the transmission in place. Because of
model differences and factory tolerances further trimming may be
required. Be sure there is At least a small amount of clearance to
allow the drive train to flex without hitting the floor. The end result
should look something like this.
4. Next you will need to mark the Tunnel Cover for the shifter location
in relation to the cover's position on the transmission tunnel. Cut a
hole approximately 3.5” in diameter for the T-56 boot to fit through.
We recommend splitting and wrapping vacuum tubing around the
diameter of the hole to prevent gouging the shifter boot. Lay the
Tunnel Cover over the transmission. With a plastic mallet tap the
flanges down so that they mate up to the angle of the floor pan.
Reposition the shifter boot as necessary to seal off the round hole.