How can you replace the rear gate lock on a 1994 Lumina Van so that it does not take 2 different keys to open the doors and the gate?

Answer 1

Replacing a lock does not necessarily mean you have to have separate keys. There are two ways to go about it.

You could go to a dealer and order a replacement cylinder. They can match it to your key. The downside to this is that, as any dealer part, this will be expensive.

You could also buy a new cylinder and take it to a locksmith that specializes in automotive locks. They should be able to rekey the cylinder to your existing key.