How do I move a welded part up and down

so basically im making a car jump then theres jacks appear from the bottom looking like it pushed it upwards.

Changing the Position property of a part will not move the rest of the weld with it

Can you at least show the block of code where you change the Position?

Why not use a PrismaticConstraint | Roblox Creator Documentation attached to 4 Parts that you use attached to the jacks?
Easy to use and script, and physics takes care of lifting the car.