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just upgrade your stock tranny, no need to swap in a different style of tranny. you will end up with more trouble IMO if you swap to the 60 or the 65.
IIRC some parts of the 65 tranny's will work in the 4t45 (ie LSD)
i would recommend talking to tejohnson from gagt.com, he is having a built 4t45 done to handle the power.
the 3500 intakes would be the only thing i would swap over IF i really felt like it.
i dont feel the gain from the 3500 intakes are going to be that much of an improvement thought. and no, dont swap the whole motor. you will have to rewire the entire engine bay to accept the PCM and electronic controls that that engine has/uses. not really worth the effort IMO.
one other thing i would possibly consider, if you can drive a manual and you like manuals, consider the Getrag 282 tranny. with a few upgrades, its been know to handle a great deal of power (as long as you start out with a good tranny)
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