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#2407139 - 11/21/17 09:26 PM Hellcat swap, automatic trans ?
AeroMonte Offline
master

Registered: 11/27/03
Posts: 5674
Loc: S.E. Missouri
Ok, I'm just starting a Hellcat swap into a 71 Barracuda. I want to use the automatic trans that came out of the donor car but not sure about the wiring issues. I plan on using the new plug and play wire kit from Chrysler for the engine but it doesn't have provisions for the transmission. Can anybody shed some light on this subject?

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#2407150 - 11/21/17 09:43 PM Re: Hellcat swap, automatic trans ? [Re: AeroMonte]
hudsonhornet7x Offline
super stock

Registered: 01/14/12
Posts: 1025
Loc: Plumer, Pa
The trans is going to cause you some troubles. With these new cars everything is interconnected. I also do not think that the 8 speed has aftermarket support for harnesses.

Personally I would run a 4l80E behind the Hellcat and enjoy the car that way.
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#2407159 - 11/21/17 09:58 PM Re: Hellcat swap, automatic trans ? [Re: hudsonhornet7x]
AeroMonte Offline
master

Registered: 11/27/03
Posts: 5674
Loc: S.E. Missouri
Someone else mentioned that too. Where would I find adaptors?

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#2407161 - 11/21/17 09:59 PM Re: Hellcat swap, automatic trans ? [Re: AeroMonte]
Saskabusa Offline
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Registered: 12/20/05
Posts: 252
Loc: Scatchamatoon
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#2407199 - 11/21/17 11:28 PM Re: Hellcat swap, automatic trans ? [Re: AeroMonte]
sp392 Offline
master

Registered: 12/18/05
Posts: 8992
Loc: Etobicoke
If using a donor car you may find some tips here:

https://www.youtube.com/watch?v=qRh5KIVO3CM

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#2407396 - 11/22/17 12:44 PM Re: Hellcat swap, automatic trans ? [Re: AeroMonte]
cudaman1969 Offline
master

Registered: 01/25/04
Posts: 4104
Loc: fredericksburg,va
I have a friend who put the 392 crate in a 68 Dart and used a 7 or 8 speed Chevy trans, works very good. I'll talk to him to get the info than pass it on. Many pieces have to be added to use that 8 speed trans, from wheel censers to output and drive shaft changes (no slip yoke)
Mike

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#2407593 - 11/22/17 07:37 PM Re: Hellcat swap, automatic trans ? [Re: AeroMonte]
AeroMonte Offline
master

Registered: 11/27/03
Posts: 5674
Loc: S.E. Missouri
Thanks. It looks like the GM 4L80 will be the best option. It has a stand alone tuner for it and Chrysler has a stand alone kit for the engine. The car has a 94 Corvette rear end in it already and an Altercation front end.

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#2409929 - 11/27/17 10:07 PM Re: Hellcat swap, automatic trans ? [Re: AeroMonte]
AeroMonte Offline
master

Registered: 11/27/03
Posts: 5674
Loc: S.E. Missouri
Will a built 5-45RFE 2wd trans hold up to the Hellcat horsepower? This car will not be beat on like a race car but will be driven.

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#2437226 - 01/18/18 09:46 PM Re: Hellcat swap, automatic trans ? [Re: AeroMonte]
AeroMonte Offline
master

Registered: 11/27/03
Posts: 5674
Loc: S.E. Missouri
Went with a GM 4L80 with a Mopar bell housing adapted to it. It's a stage V from RPM transmissions. It fits the car very well and has a stand alone tuner for the trans which plugs into the HOLLEY DOMINATOR wiring kit I'm using. I'll try to post pics later. The cars previous owner cut the floor for a modern 5 spd and the 4L80 is much smaller so....need to fab a tunnel now.

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#2437261 - 01/18/18 10:36 PM Re: Hellcat swap, automatic trans ? [Re: AeroMonte]
WO23Coronet Offline
master

Registered: 01/08/08
Posts: 4006
Loc: Canada
Good plan passing over the 545rfe. It seems any power over stock kills them

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#2438742 - 01/21/18 08:19 PM Re: Hellcat swap, automatic trans ? [Re: AeroMonte]
kpzbee Offline
super stock

Registered: 01/20/03
Posts: 882
Loc: Wooster, Ohio
Originally Posted By AeroMonte
Someone else mentioned that too. Where would I find adaptors?

I'm using one of these 5.7L-350AT with a 4L60E behind an Eagle. http://www.wilcap.com/mopar.html
It's a really nice piece that's 3/4" thick.
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It's really just one endless project designed to induce insanity and bankruptcy."

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