Okay. I did that.
When I cleared and regened the cache I went to start the game up, it worked and loaded it up.
Once I got to the vehicle menu it didn't have the SMV4 pack anymore. And it didn't have the truck that I just renamed doing the steps you guys told me.
Should I reinstall SMv4 from Mediafire? I tried moving the SMV4 out of the packs folder and moving it back but it still didn't work.
I didn't expect such a quick response for my problem aswell, so thanks.
I just need to know the SMv4 problem aswell as my truck problem.