Was the shaft portion on your replacement fan clutch bigger than the factory one?
The shaft on my factory one is smaller requiring a 7/8 size wrench.
At the shop one of the mechs there was trying to tell me that this one is too big to go back into my truck. I didn't want to contest him because he's helped me on a few things before, but he has instilled some doubt into my mind. I tried for the second time today to remove the old fan clutch and was unable to get the old one to budge. Nothing the shop had was able to hold the water pump pulley from turning. We used a hammer on the wrench to try shocking it loose, but no go.The mech was looking at the new fan clutch and was saying the threads are too large. I'm wanting to think the threads are the same, just that the shaft was smaller on the old one. Any feedback on this?