[1968_K20_4x4]

Originally Posted by Stocker

You're on the right track! My K20 does have factory A/C. Also, the original fan clutch was a heavy duty unit. Interestingly, my local NAPA store listed only a standard duty unit for my truck, but their information was incorrect. Either fan clutch should work well for you, although towing your camp trailer *might* require additional cooling. I would also suggest considering a 7-blade fan. Mine is factory, and is quiet.

If you haven't already seen it, Hayden's website shows the differences between clutch types. https://www.haydenauto.com/en/produc...-types/thermal

Thanks for the reply and for that link- very good info there!

I think a 7 blade fan would be perfect for my truck, but when I did some looking I couldn't find one that specifically fit our trucks. Do you happen to have a part number for your factory original one that I could use to help me search?