Chevrolet 2003 Venture Owner's Manual page 23

Adjusting the Bucket Seats
There are two adjustment levers on each seat to adjust
the seat forward or rearward.
The other lever is
located on the rear of the
bucket seat.
Lift up either lever and slide the seat forward or
rearward.
Release the lever. Push and pull on the seat to make
sure it is locked into place.
One is located below the center, in front of the
bucket seats.
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