5.7 swap help
5.7 swap help
I want to do a swap but I have some questions.
1. What year hemi
2. Will any hemi fit
3. What else will I have to upgrade besides tranny
4. How much money should I pay for a reliable motor?
1. What year hemi
2. Will any hemi fit
3. What else will I have to upgrade besides tranny
4. How much money should I pay for a reliable motor?
Record Breaker
Joined: Jan 2011
Posts: 2,063
Likes: 5
From: Sandy, UT. (SLC Suburbs)
03 to 08 hemi EZA or EZB, from any truck or durango.
Then you will need a wiring harness from a 4.7 v8 dakota, and a harness from a 5.7 truck or durango.
You will need the PCM from an 05 or 06 Dakota with the 4.7 v8.
You will need a 545RFE transmission with the separator plate for the 5.7 hemi. Or, if your truck is a standard, you might need a bellhousing unless the mounting is the same on the 3.7, I am not sure on that.
You will need a BBK 80mm Cable operated throttle body
You will need to make, or have made, a custom drivers side block plate engine mount.
You will need the 4x4 engine isolators from a 4.7 v8, plus the passenger side block plate for the 4.7 too.
Then you need an SCT tuner for a 4.7 PCM, tuned by a local dyno shop, or Sean at Hemifever.
You can have the stock exhaust mated to the 5.7 exhaust manifolds, or you can have exhaust built from the headers back. Most run of the mill exhaust shops won't want to do either because they don't know what the fk they are doing half the time and won't take the risk.
Your truck has the 8.25 rear end, so you may want to get a 9.25 with 3.92 gears, or have gears done 'cause 3.55s are slugs
I don't think I'm forgetting anything, but if I am I will post back, let me know if you have any other questions.
Then you will need a wiring harness from a 4.7 v8 dakota, and a harness from a 5.7 truck or durango.
You will need the PCM from an 05 or 06 Dakota with the 4.7 v8.
You will need a 545RFE transmission with the separator plate for the 5.7 hemi. Or, if your truck is a standard, you might need a bellhousing unless the mounting is the same on the 3.7, I am not sure on that.
You will need a BBK 80mm Cable operated throttle body
You will need to make, or have made, a custom drivers side block plate engine mount.
You will need the 4x4 engine isolators from a 4.7 v8, plus the passenger side block plate for the 4.7 too.
Then you need an SCT tuner for a 4.7 PCM, tuned by a local dyno shop, or Sean at Hemifever.
You can have the stock exhaust mated to the 5.7 exhaust manifolds, or you can have exhaust built from the headers back. Most run of the mill exhaust shops won't want to do either because they don't know what the fk they are doing half the time and won't take the risk.
Your truck has the 8.25 rear end, so you may want to get a 9.25 with 3.92 gears, or have gears done 'cause 3.55s are slugs
I don't think I'm forgetting anything, but if I am I will post back, let me know if you have any other questions.
Record Breaker
Joined: Jan 2011
Posts: 2,063
Likes: 5
From: Sandy, UT. (SLC Suburbs)
Oh, if you get an engine from a durango, you need to change the oil pan and pickup tube to the ram 1500 variations. and if you are 4x4, you will need to have the oil pan modified to clear the differential.
I also recommend getting an 05 motor, it will make things easier because you don't have to deal with the MDS option, and the weak low end and valve springs of the 03 and early 04 engines won't be an issue.
Also, another thing to mention, even the 05+ has a rather weak set of valve springs and changing them to all exhaust springs from the 6.1 hemi motor is recommended. As well as the timing chain tensioner, it has been known to fail way too early, so the 6.1 hemi tensioner is a much better design.
I also recommend getting an 05 motor, it will make things easier because you don't have to deal with the MDS option, and the weak low end and valve springs of the 03 and early 04 engines won't be an issue.
Also, another thing to mention, even the 05+ has a rather weak set of valve springs and changing them to all exhaust springs from the 6.1 hemi motor is recommended. As well as the timing chain tensioner, it has been known to fail way too early, so the 6.1 hemi tensioner is a much better design.
Last edited by FrenicX; Oct 23, 2013 at 09:49 PM.
Oh, if you get an engine from a durango, you need to change the oil pan and pickup tube to the ram 1500 variations. and if you are 4x4, you will need to have the oil pan modified to clear the differential.
I also recommend getting an 05 motor, it will make things easier because you don't have to deal with the MDS option, and the weak low end and valve springs of the 03 and early 04 engines won't be an issue.
Also, another thing to mention, even the 05+ has a rather weak set of valve springs and changing them to all exhaust springs from the 6.1 hemi motor is recommended. As well as the timing chain tensioner, it has been known to fail way too early, so the 6.1 hemi tensioner is a much better design.
I also recommend getting an 05 motor, it will make things easier because you don't have to deal with the MDS option, and the weak low end and valve springs of the 03 and early 04 engines won't be an issue.
Also, another thing to mention, even the 05+ has a rather weak set of valve springs and changing them to all exhaust springs from the 6.1 hemi motor is recommended. As well as the timing chain tensioner, it has been known to fail way too early, so the 6.1 hemi tensioner is a much better design.
Record Breaker
Joined: Jan 2011
Posts: 2,063
Likes: 5
From: Sandy, UT. (SLC Suburbs)
Fuel system can handle a modded hemi, so you're good there. Just use some fuel injector hose and cut/flare the metal elbow.
The stock cats aren't too bad considering, but they are made for the 4.7 so upgrading to highflows or stock hemi ones would help. The cooling fan will fit behind the radiator just fine, but its a great time to upgrade to an electric fan, but you have to go ***** out or it won't cool the hemi with the stock radiator, but the clutch fan will.
On the engine mounts, they are a one piece cast iron on the 2wd, that's why you get the 4x4 ones because they can be modified with the 4x4 isolators, passenger side block plate, and custom plate on drivers side.
The stock cats aren't too bad considering, but they are made for the 4.7 so upgrading to highflows or stock hemi ones would help. The cooling fan will fit behind the radiator just fine, but its a great time to upgrade to an electric fan, but you have to go ***** out or it won't cool the hemi with the stock radiator, but the clutch fan will.
On the engine mounts, they are a one piece cast iron on the 2wd, that's why you get the 4x4 ones because they can be modified with the 4x4 isolators, passenger side block plate, and custom plate on drivers side.
Fuel system can handle a modded hemi, so you're good there. Just use some fuel injector hose and cut/flare the metal elbow.
The stock cats aren't too bad considering, but they are made for the 4.7 so upgrading to highflows or stock hemi ones would help. The cooling fan will fit behind the radiator just fine, but its a great time to upgrade to an electric fan, but you have to go ***** out or it won't cool the hemi with the stock radiator, but the clutch fan will.
On the engine mounts, they are a one piece cast iron on the 2wd, that's why you get the 4x4 ones because they can be modified with the 4x4 isolators, passenger side block plate, and custom plate on drivers side.
The stock cats aren't too bad considering, but they are made for the 4.7 so upgrading to highflows or stock hemi ones would help. The cooling fan will fit behind the radiator just fine, but its a great time to upgrade to an electric fan, but you have to go ***** out or it won't cool the hemi with the stock radiator, but the clutch fan will.
On the engine mounts, they are a one piece cast iron on the 2wd, that's why you get the 4x4 ones because they can be modified with the 4x4 isolators, passenger side block plate, and custom plate on drivers side.
1. It's hard to determin but what would the final cost look like after full engine, milled heads, springs, ect
2. Could body modification like welding on the frame be avoided?
3. Would a turbo be good to install? Or good stock?
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Record Breaker
Joined: Jan 2011
Posts: 2,063
Likes: 5
From: Sandy, UT. (SLC Suburbs)
Final figure is hard to determine, an extra 150 horses is nothing to sneeze at, and for the cost of a used engine around 1k to 2k, mods of 1k, required bits for 1k ish, and another 1k for a healthy buffer.. And were you a 6 speed or auto? There's another 1k easy for a good 545rfe. And the rear end.. Not sure how much a used 9.25 would cost.
If you were going from a 4.7, I could say 5k could more than cover it all, but since you will have to change the weak parts out it goes up quick.
You won't need to touch anything on the frame. The mounting will be in 3 sections. The plate that mounts to the block, an OEM rubber isolator from the dealer that will be between the plate and the existing frame brackets. It's truly an easy swap relatively.
Check my links in my signature, you will be able to see what I did for the engine mount. I'm also 2wd so it will be the same for you, as far as mounts are concerned. I'm extremely happy with this upgrade, and you have a 3.7, so imagine 2 more liters instead of just 1.
If you were going from a 4.7, I could say 5k could more than cover it all, but since you will have to change the weak parts out it goes up quick.
You won't need to touch anything on the frame. The mounting will be in 3 sections. The plate that mounts to the block, an OEM rubber isolator from the dealer that will be between the plate and the existing frame brackets. It's truly an easy swap relatively.
Check my links in my signature, you will be able to see what I did for the engine mount. I'm also 2wd so it will be the same for you, as far as mounts are concerned. I'm extremely happy with this upgrade, and you have a 3.7, so imagine 2 more liters instead of just 1.
Final figure is hard to determine, an extra 150 horses is nothing to sneeze at, and for the cost of a used engine around 1k to 2k, mods of 1k, required bits for 1k ish, and another 1k for a healthy buffer.. And were you a 6 speed or auto? There's another 1k easy for a good 545rfe. And the rear end.. Not sure how much a used 9.25 would cost.
If you were going from a 4.7, I could say 5k could more than cover it all, but since you will have to change the weak parts out it goes up quick.
You won't need to touch anything on the frame. The mounting will be in 3 sections. The plate that mounts to the block, an OEM rubber isolator from the dealer that will be between the plate and the existing frame brackets. It's truly an easy swap relatively.
Check my links in my signature, you will be able to see what I did for the engine mount. I'm also 2wd so it will be the same for you, as far as mounts are concerned. I'm extremely happy with this upgrade, and you have a 3.7, so imagine 2 more liters instead of just 1.
If you were going from a 4.7, I could say 5k could more than cover it all, but since you will have to change the weak parts out it goes up quick.
You won't need to touch anything on the frame. The mounting will be in 3 sections. The plate that mounts to the block, an OEM rubber isolator from the dealer that will be between the plate and the existing frame brackets. It's truly an easy swap relatively.
Check my links in my signature, you will be able to see what I did for the engine mount. I'm also 2wd so it will be the same for you, as far as mounts are concerned. I'm extremely happy with this upgrade, and you have a 3.7, so imagine 2 more liters instead of just 1.