Another 5.2 > 5.9 swap - Dodge Durango Forum and Dodge Dakota Forums
5.2L/5.9L/6.7L Engines Questions regarding the 5.2L/5.9L/6.7L V8 Engines

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post #1 of Old 06-04-2011, 07:33 AM Thread Starter
chlngr1970
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Another 5.2 > 5.9 swap

I scored a 2K Dakota R/T motor/trans/rear/Computer with a MP computer to boot! I haven't seen them yet, but are there any visual ques that denote an R/T drive train, vs a regular 5.9/auto/9.25 rear? I'm also looking for any pointers for when I drop the 5.9 into my '98 Dak Sport 4X4.

Planing on freshening up the motor with new rings, Bering's, gaskets...besides the MP Magnum book, are there any other resources for modding them? I'm assuming it's easier to put in headers while the motor is out, so will be looking at that while I am doing the swap.

TIA, and feel free to direct me to any threads that would be relevant.

j

1970 Plymouth Duster Big Block Project 451 Stroker conversion; 1971 Dodge Demon Sizzler EV2 Hemi Orange Small Block Project 5.9 Magnum/46RE conversion; 1997 Ram 3500 dually 5.9 CTD ( my truck ); 2003 Dodge Durango ( GF truck ); 2012 Chrysler 200 LX ( GF car ); 2013 Dodge Avenger SXT Blacktop edition
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post #2 of Old 06-04-2011, 11:16 AM
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it's not going to bolt in. sorry.


the R/Ts are 2wd only. you just said yours is a 4x4. you're going to have to do an axle flip kit to it in order to make the rear fit, because 2wd Dakota's are spring under axle, the 4x4s are spring over axle.

the R/T rears are all 3.92 ratio with an LSD in the 9.25" axle. that's the only difference that pertains to R/Ts otherwise the 5.9L motor and trans are exactly the same as any other 5.9L of the same year. sucks doesn't it! sorry man, nothing special about the R/T drivetrain other than the gearset, and the 5.9L motor. and you can option up to the gearset in any of the trucks if you wanted to.

now, if you just want the motor, it will drop right into place where your 5.2L sits, and probably don't even need an R/T PCM or the MP one unless your 5.9 has other mods to it like headers, intake, etc.

the 5.9Ls respond well to the "simple" bolt ons while it's out of the truck--intake manifold, headers, camshaft, computer tune, shift kit in the auto trans, etc. you should be able to make 350-380 hp if you pick the right cam and work with the right aftermarket engine tuner like Sean at SCT
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post #3 of Old 06-04-2011, 10:33 PM Thread Starter
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I was just excited about the 5.9 the rest is a package deal the guy won't part. I was actually talking with the guy about getting me the people that called him looking for the tranny, and maybe the rear end hell, If I could sell the tranny for 3-5 bills, and the rear end for a couple, I'd be just fine with that.

My plan is pretty simple. Simple bolt on mods to bring up torque as I would like to use the truck for towing my Duster and Demon to the track for weekend play. As I understand it, if I swapped in the 9.25, I would have to change the gearset in the other the front Dif to match, correct?

Hmmm...3.92 gearsets...I think I could handle that

j

1970 Plymouth Duster Big Block Project 451 Stroker conversion; 1971 Dodge Demon Sizzler EV2 Hemi Orange Small Block Project 5.9 Magnum/46RE conversion; 1997 Ram 3500 dually 5.9 CTD ( my truck ); 2003 Dodge Durango ( GF truck ); 2012 Chrysler 200 LX ( GF car ); 2013 Dodge Avenger SXT Blacktop edition
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post #4 of Old 06-07-2011, 02:54 PM
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yes, if you swapped gear ratios on the rear axle, you need to match it up front or you'll tear shit up.

now, don't expect that rear axle to just bolt right in. you need to do an axle flip kit to it to get it from 2wd config to 4wd config. the 2wd trucks have a totally different suspension than the 4wd trucks, coil springs vs torsion bars up front, and spring over axle vs spring under axle in the rear.

you would need to cut and relocate the spring mounting pads on the axle to move them from the bottom, to the top, so that you can take that 2wd axle and put it into your 4wd truck.
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post #5 of Old 06-09-2011, 06:37 PM Thread Starter
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So, got the parts home last night. It is indeed a 360 as denoted on he block, so YAY for me! It is complete from the plastic intake hose to the output shaft of the trans. Forgot to ask if he had the drive shaft tho...oops. I got two computers along with all the connectors cut off with about 3"-4" of wire for a pigtail. Their plan was to send the pigtails off to a place that would make a harness for the car they were going to put the drive train in. Now, that got me to thinking...if I can find that operation, I should have them build me a harness for my Demon

Now to the questions...

Computer: Is there much of a difference between the '98 5.2 and the 2000 5.9 computer wise? Where is it located?

Harness: is there much of a difference between harnesses from '98-'00, and 2WD-4WD?

What should I prep for for aftermarket goodies like headers, intake, cam, and the like? This is going to be for towing more than racing, so low end torque is high priority.

Thanks

j

1970 Plymouth Duster Big Block Project 451 Stroker conversion; 1971 Dodge Demon Sizzler EV2 Hemi Orange Small Block Project 5.9 Magnum/46RE conversion; 1997 Ram 3500 dually 5.9 CTD ( my truck ); 2003 Dodge Durango ( GF truck ); 2012 Chrysler 200 LX ( GF car ); 2013 Dodge Avenger SXT Blacktop edition
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post #6 of Old 06-09-2011, 07:52 PM
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The computers i am pretty sure look and work the same, it's just the tune. The 5.9 would have a different fuel/spark/timing curve than a 5.2, etc. You could have your 5.2 computer tuned and it'd work..but, i think it'd be cheaper to just use a 5.9 Computer off the bat.

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post #7 of Old 06-10-2011, 11:56 AM
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not if he's going to use an aftermarket cam, intake, exhaust, etc in which case, he wants to go with Sean at Hemifevertuning.com and go with an SCT tune.

the fuel maps and timing curves are probably close enough that the computer won't know if you're running a 318 or a 360. afterall, there is no mass airflow sensor. just Manifold pressure, throttle position, crankshaft sensor for RPM, and O2 sensors for the air/fuel ratios. the 318 computer will work fine on a stock 360.

but, you can also go with SCT and get a program written for your specific 360 with whatever mods you do to it, and load it onto your stock computer. then you can use your stock computer and wire harness, and everything will just bolt right in.
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post #8 of Old 06-11-2011, 01:01 PM
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Quote:
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The computers i am pretty sure look and work the same, it's just the tune. The 5.9 would have a different fuel/spark/timing curve than a 5.2, etc. You could have your 5.2 computer tuned and it'd work..but, i think it'd be cheaper to just use a 5.9 Computer off the bat.
It was by accident but I have a 5.2 computer with my 5.9. It runs fine.

99 Durango 5.9, FT 4x4, IP stage III w/ K&N air hat, M1, SCT, Fastman TB, 1.7 RR, JBA headers, Borla cat back, Martin Saine valve body, Hotchkis swaybars, Blistein shocks, lowered 2" Black Rhino Kenya wheels, 246. 7 RWHP, 319 TQ
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post #9 of Old 06-11-2011, 03:03 PM
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Send a message via Yahoo to synpsycho
A friend of mine has done 2 of these swaps now...one in a 98 grand cherokee and just finished one in a 00 durango and has never swapped the ECU...we let them isle up to temp shut it down drink a soda...then start them back up and burn the tires off...but a tune I'm sure would help greatly

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post #10 of Old 06-11-2011, 08:31 PM
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i believe your truck should already have the 9.25 rear since its a v8 so no need to swap it
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post #11 of Old 06-11-2011, 08:46 PM
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Stick with stock manifold. M1 raises tourqe curve. I'd go with a 50mm tb for towing

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post #12 of Old 06-12-2011, 02:39 AM Thread Starter
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This is the rear end I have...
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File Type: jpg Dak Rear.jpg (180.4 KB, 28 views)

1970 Plymouth Duster Big Block Project 451 Stroker conversion; 1971 Dodge Demon Sizzler EV2 Hemi Orange Small Block Project 5.9 Magnum/46RE conversion; 1997 Ram 3500 dually 5.9 CTD ( my truck ); 2003 Dodge Durango ( GF truck ); 2012 Chrysler 200 LX ( GF car ); 2013 Dodge Avenger SXT Blacktop edition
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post #13 of Old 06-12-2011, 02:58 AM
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also i believe the computers are not interchangable from a 1998 to 2000
ive done that mistake there is something that changed from 1999 to the 2000

408 R/T
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post #14 of Old 06-12-2011, 03:24 AM
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This is the rear end I have...
idk what rear that is look in your glovebox and i think all v8s had the 9.25 rear
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post #15 of Old 06-12-2011, 03:52 AM
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Glovebox sticker will tell you what rear end and gear ratio you has.

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