You might find something from a 4x4 website, Does the Tremec have a different connector? I personally would prefer a single cable, but an extension might be more economical. A quick web search revealed an extension: https://www.dakotadigital.com/index...40/category_id=311/mode=prod/prd1140.htm
https://www.summitracing.com/search/part-type/speedometer-cable-adapters?N=transmission-type%3Atremec-tko-600
or a new longer cable:
https://transmissioncenter.net/product-tag/speedometer-cables/?product-category=gm


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