While I agree with Attorney Quick, the facts that you lay out suggest that your situation falls within one of those exceptions mentioned. A property held as joint tenants with rights of survivorship is not subject to dower and the wife would not need to consent to its sale or transfer. There is no reason why the wife cannot sign, even if it is not required, if she is willing to do so.
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When a married man wants to transfer his interest in property, his wife must sign, barring some exceptions.
It would be wise to contact an estate planning or real estate attorney in your area to discuss details of your wishes and how best to achieve them.
As a general rule, if the home is not your primary marital home, and/or it is pre-marital property, then your wife does not have to consent to a transfer of your ownership interest.
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I concur with Attorney Frederick. Dower rights in Michigan have survived judicial scrutiny in the last several years and have yet to be legislatively abolished. This makes Michigan the exception rather than the rule. The term "joint tenants with full rights of survivorship" also has a specific meaning under Michigan law that is atypical of other states. That is why it is imprudent to answer questions outside of your state of jurisdiction - you don't know what you don't know. Unfortunately, laypersons are often unaware of how significantly the law can vary from state to state. Therefore, a questioner using this site might not realize how important it is to only consider advice from an attorney licensed to practice law in the relevant state.
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Michigan Land Title Standard 4.4 "dower – joint tenancy"
standard : a wife has no inchoate dower in real property that her husband and one or more other persons own as joint tenants .
The above answer is generalized reply to an question and is not intended to be legal advice or establish an attorney-client relationship with you. If necessary you should meet with an attorney and provide the attorney with all relevant documents and get an attorney opinion or advice on your situation.