88-93 engine swap
Legend
Joined: Jun 2009
Posts: 8,025
Likes: 72
From: orangeville ontario
this might help straighten thing out.
There's been a lot of guys wanting to swap out the 3.9 for a 5.2 motor on a 2WD truck. There has been a lot of speculation on the motor mounts. Well here is the real deal:
The engine brackets from the 3.9 (below) will not fit the 5.2 motor.
You will need the engine brackets for the 5.2 (shown below). Hopefully your donor will have them already on. If not, take note of how the bracket bolts to the "ears" on the side of the motor. It should be on the front side of the "ears". Also, you will need the adapter bracket for the driver's side frame bracket. (shown below) This puts the mount forward and lower.
On the driver's side, the new frame bracket it is held in by 4 bolts instead of 3. The new bracket is mounted as shown below. The old triangle brackets for the frame are no longer needed.
On the passenger frame bracket, the first pic shows how the 3.9 mounts and the second pic is of the new location for the 5.2 motor. Once again, the triangle bracket is not needed. The motor mount is now bolted directly to the crossmember in the furthest forward location. Should be a dimple above the bolt hole.
This pic shows both sides mounted in the new locations. This pushes the mount forward and a little lower. Should be pretty much level and even now.
The engine brackets from the 3.9 (below) will not fit the 5.2 motor.
You will need the engine brackets for the 5.2 (shown below). Hopefully your donor will have them already on. If not, take note of how the bracket bolts to the "ears" on the side of the motor. It should be on the front side of the "ears". Also, you will need the adapter bracket for the driver's side frame bracket. (shown below) This puts the mount forward and lower.
On the driver's side, the new frame bracket it is held in by 4 bolts instead of 3. The new bracket is mounted as shown below. The old triangle brackets for the frame are no longer needed.
On the passenger frame bracket, the first pic shows how the 3.9 mounts and the second pic is of the new location for the 5.2 motor. Once again, the triangle bracket is not needed. The motor mount is now bolted directly to the crossmember in the furthest forward location. Should be a dimple above the bolt hole.
This pic shows both sides mounted in the new locations. This pushes the mount forward and a little lower. Should be pretty much level and even now.
Veteran
Joined: Aug 2010
Posts: 449
Likes: 1
From: San Antonio, Texas
Hey guys, if you have any specific questions that the pictures don't show or you don't understand, throw them at me. I'll try to answer them the best I can. It really wasn't that hard to swap.
Something that came up later was that you will need the 1pc V8 kickdown linkage too. The V6 2pc linkage won't work. I went to the JY and picked up one for like $5 but I realized later that the linkage rod on my old 383 was exactly the same.
The transmission cooler line that crosses over to the passenger side of the radiator will need to be bent to go in between the oil pan and crossmember or get a V8 line from JY to go all the way around the front of the oil pan the correct way.
Of course the computer and wiring harness from the donor is needed as well. The engine wiring harness is basically the same with the exception of the Throttle Body temp sensor. Everything else was identical. I've heard of some guys running without that sensor so it can be done. According to the FSM it enrichens the air fuel mixture on a hot restart.
Lastly, on WOT the V6 exhaust is restrictive. I believe it is something like 1 7/8" pipe. You may want to upgrade to a larger diameter pipe down the road or dual exhaust.
Something that came up later was that you will need the 1pc V8 kickdown linkage too. The V6 2pc linkage won't work. I went to the JY and picked up one for like $5 but I realized later that the linkage rod on my old 383 was exactly the same.
The transmission cooler line that crosses over to the passenger side of the radiator will need to be bent to go in between the oil pan and crossmember or get a V8 line from JY to go all the way around the front of the oil pan the correct way.
Of course the computer and wiring harness from the donor is needed as well. The engine wiring harness is basically the same with the exception of the Throttle Body temp sensor. Everything else was identical. I've heard of some guys running without that sensor so it can be done. According to the FSM it enrichens the air fuel mixture on a hot restart.
Lastly, on WOT the V6 exhaust is restrictive. I believe it is something like 1 7/8" pipe. You may want to upgrade to a larger diameter pipe down the road or dual exhaust.
Last edited by SixGun; Apr 12, 2013 at 03:52 AM.
Registered User
Joined: Apr 2013
Posts: 4
Likes: 0
need magnum v6 motor mount brackets
I am trying to put a brand new magnum v6 ( new factory nos engine) in my 1989 d100 904 pickup. I need the v6 magnum brackets. Do you have a pair or what is the part number. Next step is to measure from the photo and fire up the miller.
Thanks
Thanks
Legend
Joined: Jun 2009
Posts: 8,025
Likes: 72
From: orangeville ontario
what was in your truck before? only reason i ask is that i think the magnum v6 may be the same as the v8 and might have both magnum and LA mount points. if your truck had a v6 i think you should just be able to swap the mount parts off your old v6 onto the magnum v6 and it should drop in.
Registered User
Joined: Apr 2013
Posts: 4
Likes: 0
magnum v6 in 1989 d100
The new magnum engine has the three bolt pattern mid block and does not have the tabs drilled like on the la blocks. The engine compartment has the v6 adaptors on the k frame. The rubber mounts - I believe the rubber isolation mounts are the same for the la and magnum v6 and v8. The original v6 and mounts are not with the truck. I believe the old v6 had the la type tab front mounted brackets. Bottom line I am looking for the v6 bracket that bolts to the three bolt pattern on the magnum v6 block. The ram van v6 mounts are close but no cigar.
The v6 brackets in the picture are what i need to find or make. Nothing has shown up at the local pull a part but 1500 rams and dakotas- both have the wrong brackets for my application. The magnum v6 in a 1992 or 1993 d100 or d150 would have the correct engine brackets.
The v6 brackets in the picture are what i need to find or make. Nothing has shown up at the local pull a part but 1500 rams and dakotas- both have the wrong brackets for my application. The magnum v6 in a 1992 or 1993 d100 or d150 would have the correct engine brackets.
Legend
Joined: Jun 2009
Posts: 8,025
Likes: 72
From: orangeville ontario
have you checked the ram vans with the v6 or v8 magnum? i think the ram vans used the same motors mounts(rubber isolation mounts) from 79-03. might be able to find what you need on one of them.
Captain
Joined: Apr 2012
Posts: 608
Likes: 2
From: Olympic Peninsula, Wa.
Not flaming, just curious... Why would you go through all of that work, for another V6? For the same amount of work, you open yourself up to two more cylinders, a whole lot more power, hardly any difference in economy, more parts availability, more aftermarket support..ect...
Veteran
Joined: Aug 2010
Posts: 449
Likes: 1
From: San Antonio, Texas
Okay here's the part numbers for the 2 motor mount brackets: 4446005 & 007. You asked about parting with them but I wanna keep them for some future project since I still have the motor and it's a keeper. The motor mount itself is the same.
Just curious if you are using this for a street truck or off-road? For off-road use, those motor mount brackets are a weak link so I strengthened mine after I broke them hitting a big freaking hole. I had some meat added to the bottom of the bracket on the passenger side. I believe the straps were 5/16" thick. This side is offset kinda like trying to hold up something heavy with your arm outstretched. Just be sure to allow space for the 3 square mounting pads. The other side is directly supported by the engine block so it doesn't have the same problem. Also, I added an inside weld down the whole length on both sides to strengthen them since originally they are welded only on 1 side. Here's some pics of what I'm talking about.
Just curious if you are using this for a street truck or off-road? For off-road use, those motor mount brackets are a weak link so I strengthened mine after I broke them hitting a big freaking hole. I had some meat added to the bottom of the bracket on the passenger side. I believe the straps were 5/16" thick. This side is offset kinda like trying to hold up something heavy with your arm outstretched. Just be sure to allow space for the 3 square mounting pads. The other side is directly supported by the engine block so it doesn't have the same problem. Also, I added an inside weld down the whole length on both sides to strengthen them since originally they are welded only on 1 side. Here's some pics of what I'm talking about.
Last edited by SixGun; Apr 13, 2013 at 03:04 PM.
Registered User
Joined: Apr 2013
Posts: 4
Likes: 0
magnum v6 in d100
The motor brackets in the van are close but too high and the gap to the gear box is about 1. 5 inches. The rubber isolation mounts are the same on the vans, d trucks v8 or v6.
I have the proper v6 adapter ( three bolt) on the k frame. The rubber mounts are the same. I have mocked up the engine and the v6 mounts pictured are what I need. I am going to cut some plate and 3.5 inch box tubing and make the mounts this weekend from the mockup and measurements from the photo. It would be much easier to come across a set of proper factory brackets.
The original plan was to replace the v6 with a v8 for this clean low mile truck.
I am the second owner - the first drove it 78,000 miles without changing the oil. No rust, barn kept but blown motor. The truck is a d100, dodge red of course, with matching red interior - bucket seats, console, air
I came across the v6 crate motor - not rebuilt but o miles new from dodge - with all the accessories : from new bosch fuel pump ( external) , injection, electrics starter filters, from the flex plate to the water pump for $ 100. The engine had been sitting so we blue printed the engine at the nascar cup shop. balance and polished crank,pulleys, and rods ,ported the heads and intake , block blueprinted, fresh mopar gaskets and mahle bearings ( that came with the engine) - including cam bearings- repainted hemi orange.
v8 would have been nice but the engine, like the truck, are brand new.
A little something to tow a 1200 lb race car.
The 904 is a fresh rebuild of the 78,000 miles tranny with help from my friends at the local dodge dealer- another cup deal.
Will send some pictures after its in .
I have the proper v6 adapter ( three bolt) on the k frame. The rubber mounts are the same. I have mocked up the engine and the v6 mounts pictured are what I need. I am going to cut some plate and 3.5 inch box tubing and make the mounts this weekend from the mockup and measurements from the photo. It would be much easier to come across a set of proper factory brackets.
The original plan was to replace the v6 with a v8 for this clean low mile truck.
I am the second owner - the first drove it 78,000 miles without changing the oil. No rust, barn kept but blown motor. The truck is a d100, dodge red of course, with matching red interior - bucket seats, console, air
I came across the v6 crate motor - not rebuilt but o miles new from dodge - with all the accessories : from new bosch fuel pump ( external) , injection, electrics starter filters, from the flex plate to the water pump for $ 100. The engine had been sitting so we blue printed the engine at the nascar cup shop. balance and polished crank,pulleys, and rods ,ported the heads and intake , block blueprinted, fresh mopar gaskets and mahle bearings ( that came with the engine) - including cam bearings- repainted hemi orange.
v8 would have been nice but the engine, like the truck, are brand new.
A little something to tow a 1200 lb race car.
The 904 is a fresh rebuild of the 78,000 miles tranny with help from my friends at the local dodge dealer- another cup deal.
Will send some pictures after its in .
