You don't need to delete the old texture. In fact it's better if you don't because the new texture will then retain the settings of the old (like LOD set and clamp mode).
When you import a texture, it asks you for a Package, Group, and Texture name. To replace an existing texture, just import it and give it the *EXACT SAME* package, group, and texture as the original.
For instance, say you've already imported the following texture:
Package: TexPackageA
Group: TexGroupA
Texture: TextureName1
When you want to replace it, just use the exact same names:
Package: TexPackageA
Group: TexGroupA
Texture: TextureName1
Keep everything identical, and the new file will replace the old one. That way, you won't have to re-link all objects/vehicles/etc. that use that texture all over again or redo any setup.
If that doesn't work for me, I usually end up renaming it, giving it like a "TOSSME" package name, replacing it, saving what I want saved, then exit UEd, and say No to save TOSSME.. It's not the most elegant way, but it works for me, when nothing else seems to.
Dicky B (of course, your mileage will more than likely vary)
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