Hello im new to this website ive looked around and cant find any descriptive answers i have a 2006 F150 xl 4.2 v6 auto I have access to a 4.6 v8 from a 2005 xlt f150 what else would i need to successfully do this engine swap just like it came from the factory can the transmission i already have work with a 4.6 if i put a different bell housing. any advice would be greatly appreciated thanks.
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Just off the top of my head.

1) full main wiring harness from the 4.6
2) PCM from the 4.6
3) tranny from the 4.6 ( the bell housing bolt pattern on the 4.6 doesn't match the one on the 4.2 and you can't swap the bell housing cuz its an integral part of the tranny.)
4) find a 4.2 donor truck, less $$ and less headaches.

 

While I do love my 6, this is of interest. Subscribed.

 

Thanks for the advice

 

Sell the 4.2 truck and buy a 5.4 equipped one

 

If you are going to swap to a V8 get a 5.4. You will need at the very least. The PCM, engine and transmission wire harness, engine and transmission, a reprogram for the PATS. Might need rad hoses too.