392 V8 Engine Swap is In and Running!! (2023 Gladiator Mojave)

[Rcoe]

Rich: I didn't remove my body. The 3.6L came out easy through the front. Grill and radiator fairly easy to remove. Didn't even remove the bumper or winch. I did put the 392, 8HP75 Trans and MP1622 transfer case in as one unit. The one piece motor "perches" are the easiest way to go. The 8HP75 for the Wrangler 392 has a unique (only it uses) bolt pattern, for the transfer case, also a unique 43 spline output shaft, you guessed it only the 392 Wrangler uses. I did source a MP3022 transfer case from a 392 Wrangler first. You then take the front half of the MP3022 and bolt it to the internals and back half of the MP1622. The internals are the same, other than the clutches, the MP1622 can take the torque and HP of the 392. Proof point, the 3.0L diesel uses the MP1622 and has nearly the same torque as the 392! You can then take the front half of your MP1622 and bolt it to the back half of the MP3022 and sell it. It would just be an MP3022 for the 850RE Gladiator/Wranglers. Even if you do have an MP3022 (quadra trac) currently in you Gladiator. It won't bolt up to the 392 transmission. If your thinking of using a truck or car 6.4L? Jeep Speed Shop has some good videos on what needs to be changed to get them to fit. The Truck 392's intake exist to the right instead of the left. The car 392 has a front sump oil pan that the jeep needs a rear sump. The 2021 392's used an aluminum oil pan. A lot of folks didn't like that. Later ones just use a metal pan. You can pick up metal oil pans from a 5.7 truck very reasonably. The Jeep 392 also has a unique timing cover that puts the alternator up high. This is because the electric power steering pump would be in the way of any "low hanging alternators". Both the car and truck 392's have low hanging alternators. Todd at the Jeep Speed Shop has videos that discuss that. Even the Mopar Crate 392 has the car timing cover, which hangs the alternator low. It was a fun project to do. I highly recommend doing it!! I am in Colorado, if you have time on your Moab trip stop by! - Tim

Thanks again for all the great info.

We are headed out the 2nd week in April and want to maybe hit a couple trails in CO, just not sure which route we are taking yet will depend on the weather out there.

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[tcabece]

Thanks again for all the great info.

We are headed out the 2nd week in April and want to maybe hit a couple trails in CO, just not sure which route we are taking yet will depend on the weather out there.

Rich: If you're coming from the East on I-70. Exit 352 (By Limon, CO, the Federal Penitentiary LOL!). That's State route 86, can take you to Colorado Springs, without coming all the way into Denver. Any how I am just off of SR-86. Tim

 

[Rcoe]

Rich: If you're coming from the East on I-70. Exit 352 (By Limon, CO, the Federal Penitentiary LOL!). That's State route 86, can take you to Colorado Springs, without coming all the way into Denver. Any how I am just off of SR-86. Tim

We are thinking of taking the southern route thru Col Springs. I used to be stationed there back in the 80's, did a lot of Jeeping up in the mountains back then. Would like to hit up some of the areas we used to go, but I bet they are all gone now.

 

[Northridge4x4]

I've heard from a few places (AMW, SoFlo and one other I can't remember right off hand) that they "can" do a swap with a manual, but they have not specified which trans.

We've done a bunch of the AMW Hemi swaps over the past 5 years. All but one of them have been autos. The manual conversion we did has been back a few times with broken transfer cases and blown manual transmissions. We are swapping it out to an auto this spring to get away from the problems.

 

[tcabece]

We are thinking of taking the southern route thru Col Springs. I used to be stationed there back in the 80's, did a lot of Jeeping up in the mountains back then. Would like to hit up some of the areas we used to go, but I bet they are all gone now.

Rich: Keep me in mind! I think you can get the book in the attached picture on Amazon? If you don't already have it? -Tim

 

[cnash]

We've done a bunch of the AMW Hemi swaps over the past 5 years. All but one of them have been autos. The manual conversion we did has been back a few times with broken transfer cases and blown manual transmissions. We are swapping it out to an auto this spring to get away from the problems.

That's unfortunate.
Maybe I'll just have to swap in an LS or LT engine with a T56 or T6060 or something.

 

[tcabece]

We've done a bunch of the AMW Hemi swaps over the past 5 years. All but one of them have been autos. The manual conversion we did has been back a few times with broken transfer cases and blown manual transmissions. We are swapping it out to an auto this spring to get away from the problems.

Northridge: I can see the broken transfer cases and transmission! A 5 speed manual 392 Jeep would certainly be the BOMB! It would be to easy and tempting to do too many burnouts though! - Tim

 

[PogiPR]

I have the 392 in and running. Still need to clear some DTC's. But for the most part it is fully functional. This is pretty much an "OEM" swap. All the parts are orderable from Jeep. For the programming you need to go to someone other than Jeep to get done. In my opinion, the Gladiator was made to do this. For example the windshield washer bottle on the 392 Wrangler's, is deep down inside the drivers side wheel well. Between the firewall and drivers side inner fender. The studs, holes and cage nuts to put it there are already installed. Unless the diesel Gladiators used the same washer bottle setup? Only the 392 Wrangler's would use that position. I kept the MP1622, Select Trac transfer case. So unlike the 392 Wrangler's, I CAN do 2H!! I suspect epic burns will ensue LOL! I kept the Mojave Orange accent color on the "valve covers" and 392 hood emblems. These too were orderable from a Jeep licensed supplier! I am kind of torn on installing the Hydro Guide. It will bolt up but isn't a Mojave "thing"!?

Very NICE!!!! I’ve always been curious about the Engine Swapped. Do you have any Christmas lights (engine,abs,error, etc.) on your dashboard? Or is it a smooth transition, sort of a plug and play type thing?

 

[nanook12]

What setup was Dodge using with the 392 -
Transmission / transfer case?

 

[tcabece]

Very NICE!!!! I’ve always been curious about the Engine Swapped. Do you have any Christmas (engine,abs,error, etc.) lights on your dashboard? Or is it a smooth transition, sort of a plug and play type thing?

PogiPR: Yes I am still working through some DTC's! You do become an expert at Jeep code and various scanners. But the goal is to have this be without and DTC's or dash lights. That said all warranties are now null and void and I can't take it to any dealer for repair. Only because Witech, Jeeps cloud based tool would not work. The VIN would show a 3.6L manual Gladiator. Witech would error out when it saw a 6.4L automatic. - Tim

 

[tcabece]

What setup was Dodge using with the 392 -
Transmission / transfer case?

Nanook: Todd at Jeep Speed Shop has some great youtube videos talking about using truck or car engines. But Dodge specifically like a 2500/3500 has the lower HP 6.4L/392 Hemi I think it's rated at 420HP and about the same torque. A few year older ones 20/21 used the 8HP70 newer ones might use the 8HP75 which uses the BorgWarner transfer case (BW 44-47). The 8HP75 for the Wrangler uses a unique transfer case bolt pattern and the transmission output shaft is 43 spline. Also unique to the 392 Wrangler. But Todd at JSS has used truck and car 6.4L/392's and details all of the work arounds. Alternator placement, oil filter placement and air intake (right vs left) he covers in detail. He even details using the 5.7L hemi. Which is physically identical to the 6.4L. But used in a lot more vehicles and therefore a more cost effective option. I think he makes or you can obtain adapters plates to bolt truck 8HP70/75 transmission to MP1622 transfer cases. Good luck - Tim

 

[JTdiRtyD]

Maybe it's been discussed but I didn't see it, but what do you guess you have into this so far? Curious how it compares to AMW prices.

 

[tcabece]

Maybe it's been discussed but I didn't see it, but what do you guess you have into this so far? Curious how it compares to AMW prices.

Wes: I am not sure it is a fair comparison? I used a used 392, 8HP75 Trans and MP3022 Transfer Case. But I'd say about half the cost. AMW was $40k so 20k savings? But they use new. Once you drive it, you know it was worth the cost and effort. I only wish I could have kept my Manual Transmission. But since I did the MP3022 front half with MP1622 internals. I can do 2H! Unlike the 392 Wranglers that are full-time 4WD. Unless you do the Atlas swap. Tim

 

[drewcnit]

Northridge: I can see the broken transfer cases and transmission! A 5 speed manual 392 Jeep would certainly be the BOMB! It would be to easy and tempting to do too many burnouts though! - Tim

I think Tyler at Tom's is working on a manual kit.

To answer another question I believe Tom's is now offering DIY kits as well.

 

[ltdodge]

Wes: I am not sure it is a fair comparison? I used a used 392, 8HP75 Trans and MP3022 Transfer Case. But I'd say about half the cost. AMW was $40k so 20k savings? But they use new. Once you drive it, you know it was worth the cost and effort. I only wish I could have kept my Manual Transmission. But since I did the MP3022 front half with MP1622 internals. I can do 2H! Unlike the 392 Wranglers that are full-time 4WD. Unless you do the Atlas swap. Tim

yeah if you can do the work yourself and save money, thats great! i wish i was that savy. im sure your enjoing your new power.


what exhaust setup do you have? is it too loud?

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