CK5
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Holley Terminator questions.

If both are from 2008, maybe it's a 6L80? It was phased in around '07 for upscale SUVs, but supposedly not in regular trucks until '09. If the transmission is for sure 1st year 4L60-E, that would be early 90's. I assume you know how many shifts it has!

I have a 2007 GMC Sierra Crew cab Denali with 6.2 and the 6L80E ,so definitely available in the trucks.
 
I have a great trans guy in south Denver. He only does bench rebuilds and takes cash. Old skool. I am in Boulder and happy to help r&r trans if needed. Also happy to look through current program yo see if issues.
 
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