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Help needed on buying a gen 3 Hemi motor #3145394
05/18/23 06:39 PM
05/18/23 06:39 PM
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Posts: 42,896
Bend,OR USA
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Cab_Burge Offline OP
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Bend,OR USA
I'm getting ready to get my feet wet on Gen 3 hemi motors, probably a 6.4 out of a wreck or burnt up pick up. I've owned and race both gen 1 and Gen 2, no gen 3 yet.
I'm planning on putting the motor and trans. in a 1967 Plymouth Satellite with the stock EFI setup and auto trans starting later this year or early next year depending on how and when I find the parts, I have no real world hands on experience yet with EFI and computer control tranny. help luckthis is a going to be a learning experience so all help is appreciated bow up
Is the 8 speed auto tranny the best choice for this project? If not which one would you choose, I have a clean slate so all options are on the table up How do I identify the motors and tranny to make sure I get what I'm trying to buy?
What are the years to look for and buy the 6.4 motors and 8 speed trannys ?
Is it best to try and use the stock wiring harnesses and controller or buy and use custom after market parts?
Thanks in advance for all the help your offering! bow

Last edited by Cab_Burge; 05/18/23 06:42 PM.

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Help needed on buying a gen 3 Hemi motor [Re: Cab_Burge] #3145398
05/18/23 07:01 PM
05/18/23 07:01 PM
Joined: Aug 2011
Posts: 2,833
Pattison Texas
CSK Offline
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CSK  Offline
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Pattison Texas
Originally Posted by Cab_Burge
I'm getting ready to get my feet wet on Gen 3 hemi motors, probably a 6.4 out of a wreck or burnt up pick up. I've owned and race both gen 1 and Gen 2, no gen 3 yet.
I'm planning on putting the motor and trans. in a 1967 Plymouth Satellite with the stock EFI setup and auto trans starting later this year or early next year depending on how and when I find the parts, I have no real world hands on experience yet with EFI and computer control tranny. help luckthis is a going to be a learning experience so all help is appreciated bow up
Is the 8 speed auto tranny the best choice for this project? If not which one would you choose, I have a clean slate so all options are on the table up How do I identify the motors and tranny to make sure I get what I'm trying to buy?
What are the years to look for and buy the 6.4 motors and 8 speed trannys ?
Is it best to try and use the stock wiring harnesses and controller or buy and use custom after market parts?
Thanks in advance for all the help your offering! bow


I know that the stock 6.4 uses only ONE narrow band o2 sensor, that makes it useless in my opinion, Holley has a good wide band set up for the gen 3 hemi


1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5

Re: Help needed on buying a gen 3 Hemi motor [Re: CSK] #3145429
05/18/23 08:27 PM
05/18/23 08:27 PM
Joined: Aug 2003
Posts: 42,896
Bend,OR USA
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Cab_Burge Offline OP
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I have a innovate LM1 converted to their LC1 dual sensor kit, I don't think I can make it work with the stock stuff for that later system, can I? confused shruggy
I appreciate your help on this up bow


Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
Re: Help needed on buying a gen 3 Hemi motor [Re: Cab_Burge] #3145452
05/18/23 09:58 PM
05/18/23 09:58 PM
Joined: Aug 2011
Posts: 2,833
Pattison Texas
CSK Offline
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CSK  Offline
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Pattison Texas
Originally Posted by Cab_Burge
I have a innovate LM1 converted to their LC1 dual sensor kit, I don't think I can make it work with the stock stuff for that later system, can I? confused shruggy
I appreciate your help on this up bow


No, not with the OEM computer set up, I would use the Holley system, it has fuel management from the wide band o2 at ALL throttle positions ie. closed loop, the factory set up on the 6.4 goes into open loop under a load & also at WOT no fuel management at all, just runs off of a base map, the Hell cat uses wide band o2 with closed loop fuel control & adds more or less fuel to keep it in the correct AFR.


1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5

Re: Help needed on buying a gen 3 Hemi motor [Re: CSK] #3145910
05/20/23 09:06 PM
05/20/23 09:06 PM
Joined: Nov 2003
Posts: 2,925
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roadrunninMark Offline
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roadrunninMark  Offline
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I think the 8 speed is the way to go. It is going in my barracuda right now but it is behind my warmed up original 318. Sound German Automotive has the controller and he is a great person to deal with. I've asked him (Russell) many questions over the years and he has always responded. I haven't even bought the controller from him yet too.


88speeder.jpg
Re: Help needed on buying a gen 3 Hemi motor [Re: roadrunninMark] #3146026
05/21/23 03:21 PM
05/21/23 03:21 PM
Joined: Aug 2008
Posts: 69
racine,wi
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70gtx1 Offline
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70gtx1  Offline
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Posts: 69
racine,wi
In my hellcat swap im running the Mopar crate controller. The mopar crate controllers are very nice for all the swaps. High quality , comes with everything ( gas pedal, body control module etc) and the PCM is unlocked so it can be tuned without unlocking it. Im running a Cope 727 for a trans. My current project is a 99 Dakota RT that I will probably go with a nice cammed 6.4 and an 8 speed. They didnt have the 8 speed really proven when I did my hellcat swap. If you get a used 6.4, make sure its a motor that didnt eat a lifter.

Re: Help needed on buying a gen 3 Hemi motor [Re: 70gtx1] #3146034
05/21/23 03:50 PM
05/21/23 03:50 PM
Joined: Aug 2011
Posts: 2,833
Pattison Texas
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Pattison Texas
Originally Posted by 70gtx1
In my hellcat swap im running the Mopar crate controller. The mopar crate controllers are very nice for all the swaps. High quality , comes with everything ( gas pedal, body control module etc) and the PCM is unlocked so it can be tuned without unlocking it. Im running a Cope 727 for a trans. My current project is a 99 Dakota RT that I will probably go with a nice cammed 6.4 and an 8 speed. They didnt have the 8 speed really proven when I did my hellcat swap. If you get a used 6.4, make sure its a motor that didnt eat a lifter.


The mopar crate controller for the 6.4 has one narrow band o2 sensor, the HC has the wide band set up.


1968 Charger COLD A/C Hilborn EFI
512ci 9.7 compression, Stealth heads, 4.10 gear A518 ODtrans 4100lb,10.93 full street car trim
2020 T/A 392 Stock 11.79 @ 114.5

Re: Help needed on buying a gen 3 Hemi motor [Re: roadrunninMark] #3146187
05/22/23 01:08 PM
05/22/23 01:08 PM
Joined: Jan 2005
Posts: 12,391
Kalispell Mt.
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HotRodDave Offline
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HotRodDave  Offline
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Kalispell Mt.
I absolutely hate all the shifting these new fangled trannys do! 8 gears is about twice what they need. These modern engines are made to make more TQ over a far broader range of RPM and they can E A S I L Y make enough TQ to work with a 4 speed auto from zero to 200 MPH with appropriate ratios.


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: Help needed on buying a gen 3 Hemi motor [Re: HotRodDave] #3146398
05/23/23 12:55 PM
05/23/23 12:55 PM
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Between a rock & a hard place
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cudadoug Offline
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Originally Posted by HotRodDave
I absolutely hate all the shifting these new fangled trannys do! 8 gears is about twice what they need. These modern engines are made to make more TQ over a far broader range of RPM and they can E A S I L Y make enough TQ to work with a 4 speed auto from zero to 200 MPH with appropriate ratios.


And to keep things as simple as possible, I would run a good ol 727 with a GV overdrive. Or the most "new trans tech" I would get is a 518 trans...lol

Re: Help needed on buying a gen 3 Hemi motor [Re: cudadoug] #3146592
05/24/23 11:28 AM
05/24/23 11:28 AM
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Kalispell Mt.
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HotRodDave Offline
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Kalispell Mt.
Originally Posted by cudadoug
Originally Posted by HotRodDave
I absolutely hate all the shifting these new fangled trannys do! 8 gears is about twice what they need. These modern engines are made to make more TQ over a far broader range of RPM and they can E A S I L Y make enough TQ to work with a 4 speed auto from zero to 200 MPH with appropriate ratios.


And to keep things as simple as possible, I would run a good ol 727 with a GV overdrive. Or the most "new trans tech" I would get is a 518 trans...lol



I like the 518, it is even simpler than GV and has a taller (more effective) OD ratio. It is just a 727 with a very simple and effective OD unit. Of course I like the a-500 even better because they are lighter, less drag, better 1st and 2nd ratios...


I am not causing global warming, I am just trying to hold off a impending Ice Age!



Re: Help needed on buying a gen 3 Hemi motor [Re: HotRodDave] #3146596
05/24/23 11:37 AM
05/24/23 11:37 AM
Joined: Jan 2003
Posts: 1,230
Chicago, IL
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PLUM_72 Offline
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Chicago, IL
Remember if you decide to use a 727/518/46RH trans, you either need to run a manual valve body, or figure out trans linkage for the 1-2 and 2-3 shift. Only the 3-4 shift is hydraulic on the 518/46RH and electronic on the 46RE. Bouchillon has an adapter kit for the throttle pressure linkage. This takes care of the 1-2 and 2-3 shift. In my opinion, if you run a modern engine, put a modern trans behind it.


1972 Dodge Challenger
Re: Help needed on buying a gen 3 Hemi motor [Re: PLUM_72] #3146647
05/24/23 03:58 PM
05/24/23 03:58 PM
Joined: Jan 2003
Posts: 5,762
Hot Rod Ridge
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Hot Rod Ridge
I built a 727 for my Road Runner. Trans break, rmvb. Mine is a 6.1 with a Procharger.

IMG_20230517_172033601.jpg
Re: Help needed on buying a gen 3 Hemi motor [Re: HotRodDave] #3146695
05/24/23 08:32 PM
05/24/23 08:32 PM
Joined: May 2005
Posts: 4,650
Florida
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Originally Posted by HotRodDave
Originally Posted by cudadoug
Originally Posted by HotRodDave
I absolutely hate all the shifting these new fangled trannys do! 8 gears is about twice what they need. These modern engines are made to make more TQ over a far broader range of RPM and they can E A S I L Y make enough TQ to work with a 4 speed auto from zero to 200 MPH with appropriate ratios.


And to keep things as simple as possible, I would run a good ol 727 with a GV overdrive. Or the most "new trans tech" I would get is a 518 trans...lol



I like the 518, it is even simpler than GV and has a taller (more effective) OD ratio. It is just a 727 with a very simple and effective OD unit. Of course I like the a-500 even better because they are lighter, less drag, better 1st and 2nd ratios...


Very happy with a 518 behind my 5.7, runs great, put together a completely automatic controller for the OD/LU.
Had a RMVB with my old 340, that got old after awhile.

Re: Help needed on buying a gen 3 Hemi motor [Re: BDW] #3146714
05/24/23 11:03 PM
05/24/23 11:03 PM
Joined: Feb 2010
Posts: 18,493
Granite Bay CA
Kern Dog Offline
Striving for excellence
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Joined: Feb 2010
Posts: 18,493
Granite Bay CA
I'm building a replacement 5.7 for my 2007 truck. The original engine will be saved for a future build.
I may use the original 5.7 in my other '70 Charger using a 500 or 518. I'll have durability with an overdrive and lockup converter. The .69 overdrive ratio is great compared to the other options out there.
If I recall, the A-500 was used in many vans. You know THOSE were not lightweight. The 2.74 and 1.74 1st and 2nd ratios are better than the 518/727.







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