Help needed on buying a gen 3 Hemi motor
#3145394
05/18/23 07:39 PM
05/18/23 07:39 PM
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Joined: Aug 2003
Posts: 41,622
Bend,OR USA
Cab_Burge
OP
I Win
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OP
I Win
Joined: Aug 2003
Posts: 41,622
Bend,OR USA
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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.   this is a going to be a learning experience so all help is appreciated   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 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!
Last edited by Cab_Burge; 05/18/23 07:42 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Help needed on buying a gen 3 Hemi motor
[Re: Cab_Burge]
#3145398
05/18/23 08:01 PM
05/18/23 08:01 PM
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Joined: Aug 2011
Posts: 2,728
Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,728
Pattison Texas
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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. this is a going to be a learning experience so all help is appreciated 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 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! 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
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Re: Help needed on buying a gen 3 Hemi motor
[Re: Cab_Burge]
#3145452
05/18/23 10:58 PM
05/18/23 10:58 PM
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Joined: Aug 2011
Posts: 2,728
Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,728
Pattison Texas
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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
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Re: Help needed on buying a gen 3 Hemi motor
[Re: 70gtx1]
#3146034
05/21/23 04:50 PM
05/21/23 04:50 PM
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Joined: Aug 2011
Posts: 2,728
Pattison Texas
CSK
master
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master
Joined: Aug 2011
Posts: 2,728
Pattison Texas
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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
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Re: Help needed on buying a gen 3 Hemi motor
[Re: roadrunninMark]
#3146187
05/22/23 02:08 PM
05/22/23 02:08 PM
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Joined: Jan 2005
Posts: 12,057
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,057
Kalispell Mt.
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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!
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Re: Help needed on buying a gen 3 Hemi motor
[Re: HotRodDave]
#3146398
05/23/23 01:55 PM
05/23/23 01:55 PM
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Joined: Aug 2003
Posts: 3,235
Between a rock & a hard place
cudadoug
master
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master
Joined: Aug 2003
Posts: 3,235
Between a rock & a hard place
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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
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Re: Help needed on buying a gen 3 Hemi motor
[Re: cudadoug]
#3146592
05/24/23 12:28 PM
05/24/23 12:28 PM
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Joined: Jan 2005
Posts: 12,057
Kalispell Mt.
HotRodDave
I Live Here
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I Live Here
Joined: Jan 2005
Posts: 12,057
Kalispell Mt.
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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!
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Re: Help needed on buying a gen 3 Hemi motor
[Re: HotRodDave]
#3146596
05/24/23 12:37 PM
05/24/23 12:37 PM
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Joined: Jan 2003
Posts: 1,216
Chicago, IL
PLUM_72
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,216
Chicago, IL
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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
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Re: Help needed on buying a gen 3 Hemi motor
[Re: HotRodDave]
#3146695
05/24/23 09:32 PM
05/24/23 09:32 PM
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Joined: May 2005
Posts: 4,399
Florida
BDW
master
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master
Joined: May 2005
Posts: 4,399
Florida
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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.
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