42Re to 46RE swap - DodgeTalk : Dodge Car Forums, Dodge Truck Forums and Ram Forums
 
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#1 Old 09-27-2011, 04:18 PM
DakotaRn
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42Re to 46RE swap

I've been told that the stock 42RE transmission will not survive behind my planned, newly rebuilt 5.9L V8. I wouldnt think so since the stock motor was the 3.9L V6. Now the question is will the 46RE be able to stand up to the 350-400 flywheel horsepower any better than the 42RE without being rebuilt? Another question: will the 46RE from a 2 wheel drive Ram 1500 bolt into the place of the 42RE in my 4x4 Dakota? I know I can switch out the longer output shaft from the Ram with the shorter one from the Dak, but is the length of the 46RE the same as the 42RE from bellhousing to transfer case? Jeez! Confused? I am. I hope someone can understand my questions and be able to offer solutions. Thanks. First time here.
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#2 Old 09-27-2011, 09:04 PM
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Welcome to DodgeTalk!

I am certainly confused haha!

I don't think either of the transmissions will withstand that kind of power without modification. For that reason alone I would go with the 46re since it is a way more popular tranny.

I am not sure but I think the bellhousing bolt pattern is the same. It "Should" fit but I have no idea.

Does your truck currently have the 3.9 in it or is it already out of there? You could try and take it easy on the truck and use the stock tranny with the 5.9 while you get the 46re built.

What about your transfer case? I have never had a 4wd dakota so I am not sure what kind of power the Tcase is supposed to handle.

haha good luck. Hopefully someone with experience will chime in and give you some help.

2000 Dakota R/t 5.9 Club Cab: SRT-4 Seats, K&N FIPK, Holley 52mm Throttle Body, Superchips 3715, 4.10 Gears, Viper Fan, 180* T-Stat, Hooker Shorty Headers, Flowmaster 50 Dumped, Lowered 2/5 with Nitro Drop Shocks, CalTracs, Boss 330's, Nitto 420s tires, Shaved Tailgate, Grant Kustoms Weld-in Rollpan.
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#3 Old 09-29-2011, 12:56 PM
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Well there are a few guys that have done the 3.9-5.2/5.9L swap and they're still running the stock 42RE.

They definitely won't withstand the power for too long, but they'll get you by until you can afford the 46RE and get it built properly.

Good luck! get some more posts so you can put pictures of your build up.


1999 Dakota R/T
Interior fully Dynamatted, B&M Hammer Shifter, 2" DJM Coils, Sir Michaels Roll Pan & Handle Relocator, '69 Camaro chin spoiler, K&N FIPK, Spintech Headers and full side exit exhaust, Mopar Performance PCM, Viper E-fan w/ Painless performance temp controller, F&B 52mm T-body, Mopar M1 2BBL intake, 180* T-stat, Dual A-pillar pod w/ AEM Wideband, AEM trans temp gauge, stock smoked tails, Clear corners and headlights with Morimoto mini projectors 6K HID and 3k fogs 20" Boss 330 wheels, Cal-Tracs, SRT-4 Seats, Performance built transmission with 2500 stall, Hotchkis sway bars, Energy Suspension poly bushing set.

Awaiting install: Hotchkis leaf springs, C-notch, Viper front brakes, Innovations Pro Sport Tonneau.

SCT Tuned by Hemifever!

Hopefully in the future...
408, 4.10 gears, Edelbrock aluminum heads, Rear disc conversion, cowl or shaker hood and more as I think of them.

My Project
1972 Dart Swinger Special
and eventually a 1978 Dodge D-100 Adventurer standard cab short bed W/ a 440!

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#4 Old 10-24-2011, 01:39 PM
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Does anyone know the actual length, in inches, of the 46RE from the front of the bellhousing to the mounting face against the transfer case? I know the length on my 42RE is close to 27 inches. I'm hoping that the 46RE is a simple bolt-in.
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#5 Old 10-24-2011, 03:30 PM
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Ill measure mine for you.

2000 Dakota R/t 5.9 Club Cab: SRT-4 Seats, K&N FIPK, Holley 52mm Throttle Body, Superchips 3715, 4.10 Gears, Viper Fan, 180* T-Stat, Hooker Shorty Headers, Flowmaster 50 Dumped, Lowered 2/5 with Nitro Drop Shocks, CalTracs, Boss 330's, Nitto 420s tires, Shaved Tailgate, Grant Kustoms Weld-in Rollpan.
Stereo:
Pioneer Premier DEH-P510UB, Pioneer Premier 6 3/4 components, Pioneer Premier 6x9 Premier 800x4 amp driving speakers, MTX Thunderform Box with 2 10" Shallow Premier subs.
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#6 Old 10-24-2011, 08:10 PM
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I had to go to work and Im at school now. Ill try and measure it when I get home.

2000 Dakota R/t 5.9 Club Cab: SRT-4 Seats, K&N FIPK, Holley 52mm Throttle Body, Superchips 3715, 4.10 Gears, Viper Fan, 180* T-Stat, Hooker Shorty Headers, Flowmaster 50 Dumped, Lowered 2/5 with Nitro Drop Shocks, CalTracs, Boss 330's, Nitto 420s tires, Shaved Tailgate, Grant Kustoms Weld-in Rollpan.
Stereo:
Pioneer Premier DEH-P510UB, Pioneer Premier 6 3/4 components, Pioneer Premier 6x9 Premier 800x4 amp driving speakers, MTX Thunderform Box with 2 10" Shallow Premier subs.
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#7 Old 11-15-2011, 08:17 PM
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Hey Monkyman, I found out the length of the 46RE. It's exactly the same as the 42RE, 27 1/2 inches. Now I wonder what differences, if any, there are between the 42RE and the 46RE, i.e., linkage, hydraulic fluids lines, etc. Is the 46RE body actually built heavier than the 42RE or is the duty rating based soley on the internals? Thanks.
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#8 Old 11-15-2011, 10:42 PM
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Pretty sure everything is internal, but don't quote me on that.

I'm sure if you have a local transmission shop you could call and they could answer those questions for you.


1999 Dakota R/T
Interior fully Dynamatted, B&M Hammer Shifter, 2" DJM Coils, Sir Michaels Roll Pan & Handle Relocator, '69 Camaro chin spoiler, K&N FIPK, Spintech Headers and full side exit exhaust, Mopar Performance PCM, Viper E-fan w/ Painless performance temp controller, F&B 52mm T-body, Mopar M1 2BBL intake, 180* T-stat, Dual A-pillar pod w/ AEM Wideband, AEM trans temp gauge, stock smoked tails, Clear corners and headlights with Morimoto mini projectors 6K HID and 3k fogs 20" Boss 330 wheels, Cal-Tracs, SRT-4 Seats, Performance built transmission with 2500 stall, Hotchkis sway bars, Energy Suspension poly bushing set.

Awaiting install: Hotchkis leaf springs, C-notch, Viper front brakes, Innovations Pro Sport Tonneau.

SCT Tuned by Hemifever!

Hopefully in the future...
408, 4.10 gears, Edelbrock aluminum heads, Rear disc conversion, cowl or shaker hood and more as I think of them.

My Project
1972 Dart Swinger Special
and eventually a 1978 Dodge D-100 Adventurer standard cab short bed W/ a 440!

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#9 Old 11-17-2011, 03:08 PM
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You will need the dust cover, engine to transmission straps and correct torque convertor and flexplate for the 46re. The 5.9 is externally balanced vs the 3.9 internal balance so keep this in mind. (By the time the "re" came along in 96, the weight on a 5.9 shifted from the converter to the flexplate, therefore both items are needed.)

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#10 Old 11-17-2011, 08:31 PM
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Thank you, B-300, for that list. Interesting thing, though. When I took out the 3.9 and started to take off the parts I could use on the 5.9, I noticed what looks like a harmonic dampener on the front that looks very similar to the one I took off the 5.9. Sometimes I really wonder about dodge, but I suppose there are little discrepencies in all the auto manufacturers. Thanks again.
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#11 Old 11-22-2011, 10:02 PM
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The 3.9 and 5.2 are internally balanced and use the same neutral balanced damper and flexplate/ converter.
The 5.9 is externally balanced and is uses a different damper and flexplate/ converter.
(If it's 96 or newer, it's the converter, earlier and it's the converter that's different.)

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