Generally, you don't have to install the controls on the production server in order to host an application that uses any Telerik control(s). In addition, the Telerik assembly might not be added to the GAC. You just need the controls' assembly in the application BIN folder and properly configure the IIS settings for the application. The most common problem when deploying an application that uses the Telerik controls is the missing embedded webresources. For details on how to resolve that issue please refer to this help article
If this is not the case, please try to provide more details on the exact problem(s) you have. It will be helpful if could send a live URL where the problem could be observed.
the Telerik team