747 Trans issue

You need to adjust the linkage.

Refer to the Factory Service Manual.

Nut shell

Get the rear up on the air.
Disconnect the trans shifter linkage
Manually shift the trans into park.
You will know it is in park because you can't rotate the drive shaft.
Move the shifter into park.

Move the adjuster till the adjuster lines up with the tran arm.

Tighten the linkage and test with rear in the air.

Remember to apply the brakes till the rear wheels stop before shifting into park or reverse