why do these vehicles fall apart when i try play they were working like 5 mins ago and now they dont? i cant ancor them because they wont drive then so idk how to fix it
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You may have accidentally unanchored the parts.
its a vehicle tho so if its anchored it wont move
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Oh im an idiot 
To have them stay together, you have to weld them together.
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“VECHILE OBBY”
Words:
Welds. Use the newer edition of the weld that dosen’t move parts around: Weldconstraint
I had a case last year where all of the WeldConstraints in one of my places disappeared. A few other people complained about it too. It turned out to be a small glitch. I was lucky that I didn’t save it with the missing welds and I was able to reload the place with no problems.
Have you used any free models, or installed any new plugins recently? If so you may have used something that had a script added that removes all welds from your place.
when i weld them it wont drive
Weld all the vehicle chassis Parts, Unions, and MeshParts together.
If you have suspension Parts don’t weld them to the chassis.
Don’t weld the wheels to the chassis.
I’m guessing you use a welding script? Separate the chassis Parts into their own Model, and put the weld script in that model.
Also make sure none of your Parts are Anchored.
Try the Search tool up top. There are lots of other posts about welding vehicles together that have Solutions.