I had about the same HP in a elcipse GSX, blew the 350's away. It's nice having a turbo.

 

It's also nice to not weigh 3600lbs like the Z does.

 

The Jeep Lower 40 concept truck is powered by a Hemi backed with a Getrag 238. It's totally doable. Maybe a friendly email to AEV Jeep conversions would get you some useful information in bolting the two together. They had a hand in the concept.

The transmission is definitely strong enough to handle a stock 345 HP Hemi.

Probably expensive, but I like it.

And welcome to the world of snarky jerkoff DF comments. Some members are obsessed with oneupsmanship.

Also, definitely check your state laws on engine swaps. Federal emissions laws say that engine swaps for modern vehicles (OBD I/II era) are restricted to engines that were available in the vehicle from the factory. So, you could swap a 4.7 or 4.7HO, but maybe not a Hemi. Obviously people do it, so it varies state by state. Alot of cool diesel or gas conversions can be foiled when the truck can't pass state emissions inspection, or get registered at the DMV.

I bet if you can get the Hemi computer to not throw any codes, and not flaunt HEMI badges all over the place until you get it inspected and on the road, you might pull it off.

 

Well thanks to all of you who gave me a nice welcome.

Im not quite positive but im going to try to make this truck a sleeper.

Ive driven so many of my friends f-body camaros and firebirds that im addicted lol. so thats my main reason for the swap and the fact that I could use it as a daily driver and get better gas milage out of the 350 hp hemi then i do with the gimp 3.7 haha.

Tranny should hold up fine, not positive about the clutch though. it might want to slip under that much power.

Rear end. possibly switching to a 4-link with coil overs for the suspension and maybe a dana 60/ or at least a 3/4 ton axle. autolocker and 3.83-4.10 gears.

is it nesicary to put in a bigger radiator or an electric fan? not like one would replace the other but would the cooling capacity of the factory components be enough to cool the hemi?

I think im going to go the route that dusty went lol because swapping a 4.7 computer and engine wiring to my truck would be so much easier then from a ram. just have the stock 4.7 ecm tuned like dustys because the tune can be sent through e-mail.

I might have more trouble with the engine fitment then dusty did because he had a 4.7 originally i have a 3.7. the motor mounts might be in diferent paces. but i think the oil pan will be fine for clearance because i dont have 4wd.

tell me what you think

Thanks,
Marten

 

You're talking about the coolest 3G Dakota built yet...tuned Hemi 6 speed, 4 link...

It sounds like money isn't much of an object.

I know I've written this before, but the "238" is nowhere to be found on Getrag's website. They list something called the 6MTI520, which is a 6 speed manual, with the same ratio spread, same synchro configuration, etc. It's gotta be the 238, or a close cousin.

http://www.getrag.de/en/239

The URL calls it the "239"...hmmmmmm

They rate that transmission to 383 FT-LB. Not clear whether it's continuous or rated on some duty cycle. Still, the occasional peak to 450+ FT-LB probably won't nuke it.

When swapping axles, keep in mind the width. A 3/4 ton axle will be wide, and might look goofy under a Dakota. But if you're going to go to all the trouble of building a 4 link, you're going to want a strong axle.

Consider that the 9.25 axle holds up just fine in alot of upgraded 1500 Hemi Ram's.

It's odd that you have the 8.25 axle...my V6 6 speed Dakota ST has the 12 bolt 9.25".

4.10's are as low as I'd go on gears. The 0.79 overdrive isn't as highway friendly as the automatics. 3.92's sound perfect.

I think a stock radiator and stout E-Fan is worth trying. If the engine gets warm, you're buying a new setup anyway.

I predict highway fuel economy stays the same. Cruising at 65 requires the same amount of power, whether you're using a 1.7 or 5.7. 22 MPG just sounds more impressive with a big motor

Sounds like a bitchin' project...

 

Thanks so much for all of the support guys!

Well Ill re check but when i looked at it last time i could have swarn it was a 10 bolt 8.25 rear but im absolutly postivly sure it has no lsd haha. if it is a 9.25 then i will definatly upgrade the carrier to a lsd type and call it a day because it has 3.92's stock right?

I HATE THE LEAF SPRINGS even with the 3.7 ive had no problem warping them into the shape of an "S" haha so has anyone had sucess with anti-wrap bars or some type of traction system for the 3rd gen daks?

I dont plan on replacing all of theis parts at the same time because of another project that i need to finish. Ill probably just replace things as they break haha.

Is the carrier style 2-piece drive shaft a problematic weak piont? because i would definatly believe that its prone to breakage.

I am only 17 but i do know what im doing and im fairly experianced with welding/ fabrication and a 4-link set up wouldnt be a huge issue. so i can save a huge lump of cash that way.

E-fans are hella easy to set up so i might just do that anyways befor the swap because the belt driven fan naturally takes up plenty of power that could be taken from the alternator draw.

Ive found a 05 hemi on craigslist with 80,000 miles with the wiring harness for 400 no computer but i dont need it anywase. said it has a small tapping noise from the valve cover... shouldnt be a very big deal. Ill prolly get headers and a cam so valve springs might need to be replaced anyway. Any typical noise these motors make? Ill check all of the mains and rod bearings while its under the knive just to be safe.

after all its going in a truck with 30,000 miles haha I hope the dealer dosnt notice bahaha!

And please no more thread jacking/ side tracking because im stuck with this truck. Dad wont sign the title over to me. but he has no mechanic ability and i plan on putting a cut out on the exhaust so maybe he wont notice lol.

 

No they can have 3.55s as well. The 3.55s are a standard and the 3.92s were an option.

 

I'd be wary of a $400 Hemi. I think they go for about $1500 on eBay. You might be getting a deal, or a bad motor. Look into the "Hemi Tick" and see if the symptoms match.

Also, it won't run without the computer...and I wouldn't buy an engine I haven't seen running with my own eyes.

Are you positive a 4.7L ECU will run a 5.7L? Again, nowadays, a CEL = failed inspection.

6 speed Dakotas only had 3.21's or 3.55's. My 9.25" axle has 3.21's. What are your RPM's in 6th gear at 60 MPH?

 

I wish this was the case but it's not safe to assume a 9.25" has 3.92 gears until you actually check them. Sitting under my truck is a 9.25" with the tow package and 3.55 gears, figure that one out, lol.

 

right i just talked to the guy again today and turns out he never had the alt, ac compressor or the ps pump on the motor... ill just have to keep looking. didnt have time to check the axle today but its around 2,000rpm at 60 if that tells you much