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Old 02-12-2019, 01:53 AM
No0w6 No0w6 is offline
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Default 6.4 Crate engine swap 2nd Gen Ram 4x4

I have a 1998 Dodge Ram 1500 4x4 with a 5.9 Magnum. I have seriously considered doing a 6.4 crate engine swap on the truck as I saw that it could be done. With money aside what kind of task would this be? Would I need to swap the tranny or could I use a built 46re? What kind of fabrication work would need to be done? Where would I start? Thanks!
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Old 02-12-2019, 07:22 AM
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You will want all the electronics from the donor truck (if that's where you're getting it), or the adaptor harness from Mopar if you are using an actual crate.

This guy put a 6.4L Truck Hemi in his 2012 1500 so you may find some useful info here: https://www.ramforumz.com/showthread.php?t=240258

The 3rd gen Hemis are compatible with smallblock (LA) 727 bellhousings, you'd just leave the top bolt out, but I am not sure if the 46RE bellhousing is different at all (I suspect not) or how you'd run the transmission. There us a 3rd gen Hemi swap page on Facebook that has a list of manufacturers who make adapter flywheels, and they may have a tutorial on 2nd gen Rams too (most swaps are 60s-70s Mopars). It would actually probably be easier if you used a 66RFE so you could use a donor PCM to run the engine and trans.

I know 3rd gen Hemis have been swapped into 2nd gen Rams before and that it requires some fab work, but I can't say just how different the mounts are. There may be someone who offers adapter mounts
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Old 02-16-2019, 01:25 PM
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Quote:
Originally Posted by Thunderhorse View Post
You will want all the electronics from the donor truck (if that's where you're getting it), or the adaptor harness from Mopar if you are using an actual crate.

This guy put a 6.4L Truck Hemi in his 2012 1500 so you may find some useful info here: https://www.ramforumz.com/showthread.php?t=240258

The 3rd gen Hemis are compatible with smallblock (LA) 727 bellhousings, you'd just leave the top bolt out, but I am not sure if the 46RE bellhousing is different at all (I suspect not) or how you'd run the transmission. There us a 3rd gen Hemi swap page on Facebook that has a list of manufacturers who make adapter flywheels, and they may have a tutorial on 2nd gen Rams too (most swaps are 60s-70s Mopars). It would actually probably be easier if you used a 66RFE so you could use a donor PCM to run the engine and trans.

I know 3rd gen Hemis have been swapped into 2nd gen Rams before and that it requires some fab work, but I can't say just how different the mounts are. There may be someone who offers adapter mounts
The mounts are not that different but they are enough so that you will need to fab to get the newer engine to mount, I do not remember off the top of my head but I think that the 2nd gen trucks use a triangular mount plate pattern on each side. The 3rd gen trucks use the same 4 bolt square pattern as the 4th gens so the main issue would be making sure the hemi you are trying to install sits low enough on the plates that the magnum sat in that you can drill holes where they are needed. If the plates are long/wide/tall enough and the actual engine lines up agreeably then it will be easy, if not it is going to require you to adjust the mounts to hold the new engine in the correct position.
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