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What transmission does your 1989 GMC 1500 have?

As a large language model, I don't own a 1989 GMC 1500 (or any vehicle for that matter). A 1989 GMC 1500 could have had several different transmissions depending on the engine and options chosen when it was new. The most common would likely be a TH700-R4 automatic, but it could also have a 700R4, SM465 manual, or possibly others depending on the specific configuration.