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Hey guys quick question if I did a swap from a 3.8 to a 4.2 in my 03 Mustang, would I need a new computer for the 4.2? Thanks
 

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No lol no new computer is required, it's a simple motor swap in deal and just run as is, a tune always helps of course but it is not necessary
 

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NO!
I re-used everything from 3.8 block and just dropped the 4.2 in it.
I didn't change anything except the flex plate and harmonic balance'r.
 
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