S-10 bucks in first gear

My Chevy S-10 2000 4.3l vortec automatic backs out of the drivewaqy fine , but bucks hard when I go forward in first gear. engine runs fine , no check engine lights.

My Chevy S-10 2000 4.3l vortec automatic backs out of the drivewaqy fine , but bucks hard when I go forward in first gear. engine runs fine , no check engine lights.

What does it doing in other gears?

Check for codes and post back if ny codes?

How is the tune up end?

2WD or 4WD? How long does the bucking last, until it shifts out of first gear into second or does it stop right away? Is it one loud clank when you stop backing up and pull forward or does it buck for a distance?

It bucks for a few seconds in first only ,then shiftd to second and runs fine. On really cold days it will take 8 or ten miles of driving before it will shift into overdrive.The engine runs smooth and sweet.

2WD or 4WD?????