5.7 Hemi in a 99 Ram 4x4
Champion
Joined: Feb 2007
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From:
Cool, man! Would love to read it whenever you get around to it. For me, I'm a Magnum fan. Mine's still strong and reliable at 23 years old and over 280,000 miles. No need to put a whole new drivetrain in just yet. But it still would be fun to read about the swap!
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Professional
Joined: Dec 2021
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From: Florida
Fit well problem is programming it. I had a shop do that.
Mine I decided to do a Hellcat halfway through but I have a video of it running with a 5.7L Hemi. Honestly there are a lot of variables. Easiest way would be get a pre made harness ($3500 with Hemi pedal, and PCM). I am going to do a write up this summer once I get the few bugs worked out. I built my own harness though. Overall not for everybody.
Mine I decided to do a Hellcat halfway through but I have a video of it running with a 5.7L Hemi. Honestly there are a lot of variables. Easiest way would be get a pre made harness ($3500 with Hemi pedal, and PCM). I am going to do a write up this summer once I get the few bugs worked out. I built my own harness though. Overall not for everybody.
Professional
Joined: Nov 2019
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Doing a hemi swap into the 2nd gen ram would be easier with a junker 3rd/4th gen, but isn't necessary. You can grab a earlier 5.7 hemi 03-08 pretty cheap these days at your favorite u-pick hole. The 46re can be built up (using 47/48re parts) to handle any power that the hemi can dish out, probably better at handling the big power than the 545rfe. I was going to run a fast efi controller/msd ignition (run a drive by cable set-up), as I already own the stuff. If you go the junker route, you might end up needing the complete wiring harness/dash to make stuff work right.
Legend
Joined: Nov 2014
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Doing a hemi swap into the 2nd gen ram would be easier with a junker 3rd/4th gen, but isn't necessary. You can grab a earlier 5.7 hemi 03-08 pretty cheap these days at your favorite u-pick hole. The 46re can be built up (using 47/48re parts) to handle any power that the hemi can dish out, probably better at handling the big power than the 545rfe. I was going to run a fast efi controller/msd ignition (run a drive by cable set-up), as I already own the stuff. If you go the junker route, you might end up needing the complete wiring harness/dash to make stuff work right.
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Professional
Joined: Dec 2021
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From: Florida
this should be the last question, driveshafts both front and rear, do I need custom ones or will the factory ones work
Record Breaker
Joined: Sep 2010
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From: Parker, SD
Also interested and following. I debated this route with my 98 as i found a completed 5.7/545 on craiglists with wiring and computers cheap earlier this year, but after some short googling I kinda decided against it. I have to much sunk in the 5.2 to change directions but maybe in the future.
course if the rumors are true i see hemi prices sky rocketing more in a couple years.....
course if the rumors are true i see hemi prices sky rocketing more in a couple years.....
Legend
Joined: Nov 2014
Posts: 8,098
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No. Also remember that the ZF will need the torque curve programed into it. So the truck will need to have the engine dynoed first then the truck taken to a shop to program the transmission.
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Professional
Joined: Dec 2021
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From: Florida
thank you so much for the information, I expected to need a tune because I’m planning on using a Holley EFI system