Chevrolet VENTURE 1999 Owner's Manual page 17

Adjusting the Split Bench Seats
There are two adjustment levers on each section of the
split bench seats to adjust the seat forward or rearward.
One is located below the center, in the front of each
section of the split bench.
Lift up either lever and slide the seat forward to allow
for extra storage behind the seat, or slide the seat back to
allow extra room for passengers.
Release the lever. Push and pull on the seat to be sure it
is locked into place.
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The other lever is located on
the rear of the seat.
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