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.