CAT 3412 twin turbo in 1996 Peterbilt 379

[@sameuljones5496]

Built a Peterbuilt 379 back in the day with a Cummins K38 1250hp v12 turbocharged engine. Ran a Allison transmission as the roadranger couldn't handle the torque and the Allison transferred the massive amount of torque of 3200ftlb to the diffs alot smoother. A voith retarder was installed also. We gained a coal contract to haul for the mines in Western Australia. She ran 24/7 pulling 4 trailers over 250 tonne payload. Only shut her down to change oil n filters. Oil n filters were changed every 250 hours which was every 10 days. That truck worked that contract for 6 years straight. We rebuilt the engine and diffs at the 3 year mark and replaced the trans as she was already at around 22,500 hours by then. At the 6 year mark she was at 45,000 hours. That engine pulled beautifully low revs and just plenty of low down torque at 1150rpm she would really pull. By the time we finisher that contract the engine was still in great condition as we had kept ontop of oil leaks over her life. She was breathing a touch by then bit still performed well. She was using about 2 litres of oil between services for top ups by then but at 45,000hours that was fine by me. That truck had well and truly earned her keep paid herself off her trailers, mine and my employees wages and even got us mortgage free. Was pleased to see it 2 months ago on the road still hauling heavy haulage and earning money for its current owner.

[@G2Customs]

That is an awesome story. I know you Australians do a lot of super heavy hauling. I would love to see pictures of the truck you described. Send me a message if you have any

[@gerfromireland8077]

What model transmission did you run and did the belt housing line up or what did you do? thanks man

[@iaial0]

Really hope the current owner takes as much care as you did

[@fabriciobarroslima]

Where are you located at now?

[@dandable]

The CAT 3412 is 27 liters!!! By comparison the 3406 is 14.6 liters!! That is one HUGE diesel in a semi truck. I want that!!

[@mattleonard5268]

It even dwarfs a huge 18L 3408 v8!

[@Retired88M]

I would have loved to see it stuffed under that extra extended hood

[@BrandonLeech]

Cummins KTA I think was the largest engine ever actually put in a truck. 19 liters but still only an in-line 6.

[@acemobile9806]

You wouldn't want the fuel burn. But holeeee chit, talk about feeling like a hero while watching the gauge drop!

[@WildWildWeasel]

27 liters is basically a freaking marine engine lmao

[@jakey8129]

Every now and then I look for this truck online… this was my grandads truck he built for heavy hauling. I was about 6 years old and would go up to his shop in evergreen with my dad to help him build it. He retired in 2004 and sold it to my uncle who heavy hauled with it for a number of years before selling it to a guy in South Dakota to turn into a show truck. Total beast of a truck. If I could rationalize quitting my current job to go trucking I would buy this in a heartbeat.

[@jacobdavis1752]

I want to see how the transmission and clutch are set up. This is unreal .

[@lockgessner]

evergreen MT?

[@jakey8129]

@@lockgessner no, evergreen Colorado

[@kevinfender507]

I thought I recognized it. Titan was the company name. I did heavy haul in the 90s. I seen this truck at Wagner. Met your grandfather. Cool truck. Has an extended extended hood. You can see the rivets in the video.

[@realmccoy9597]

Dave Youngblood built the truck and Cody Pickering bought it from him.

[@thomasparkin4183]

I owned and operated a 94 T600. 3406 (opened up,unrestricted) 13 spd with 390 rears. Was the very best I ever operated and the only one I owned. Was O/O for about 6 years. Made good money with that little truck.

[@motorhomeman1949]

What a sweet old truck! It's actually pretty cool seeing one of those with a mostly original dash too, instead 5 billion accessories from the chrome shop.

[@goodoledays1355]

I saw it listed as well. That's a badass truck, a lot of ingenuity

[@thomasparkin4183]

A Caterpillar expert, an old friend, told me that if you match your horsepower to you Tach o your gear ratios; you can build a sweet ride. He's also the one who set up my T600.

[@alpzerlaken]

This is more of the beast than the 3408 Cat V12 sound awesome

[@Mike-xu4eg]

I ran a morbark grinder with a 3412 @1000 hp. Best sounding engine ever.

[@Retired88M]

I like how the hood was extended to fit that big engine

[@jacobdavis1752]

It does have a brake saver I see on the column

[@Darth-Nihilus1]

I love how that is able to fit under the hood, it’s like taking two 3406’s and putting them into one ❤ with a peak torque of 3200 and you can get more and with the C32 you can get more 😢 I wish EPA 2004 and 2012 never happened or we would Caterpillar as an option over Craptroit and CacaCummins plus screw PACCAR. Emissions ruined Cummins and Detroit

[@jakey8129]

Funny thing is it didn’t fit… he had to lengthen the frame by 10”. Subsequently adding the 10” on to the hood as well as you can see the chrome extension.

[@matthewmiller2268]

Going through the process of installing speed of air pistons, super porting and shaping the ports, contour angle back cutting and unshrouding the valves, adding thermal barrier and dispersant coatings, regrinding the camshaft to logger torque cam specs so the engine will have more power and torque and have cleaner emissions

[@BrandonLeech]

Wonder what the clutch and transmission setup is. Obviously they don’t make no truck parts that are actually rated for what a 27 liter will put out. What’s crazy is you could see like 4 of these motors working to push a tugboat around.

[@G2Customs]

The transmission is an 18 speed high torque with twin countershafts. The complete power train and braking/torque retarder was all engineered to work together.

[@jacobsinger97]

Ohh helll yeaa😎 looks solid. I like the eagle badge there on the hood

[@redmesa2975]

Did that belong to Titan heavy haul in Colorado at one time ? I saw a lighter color green Pete with the same engine back around 2000. Spoke with the owner. He gave the specs. Mack 18sp, with 4spd auxiliary transmission. Exhaust brake, because no Jake Brakes are available. It had a klam driveline retarder too.

[@G2Customs]

@redmesa2975 yes, Titan had this truck built

[@jareen827]

Real curious what it got for MPG. I had a 3408 in my Pete in the late 70s . It got 3- 3 1/2 mpg after a tune up. It was hard on fuel but a lot of power

[@noahlarson1861]

What's she get, about 3 gals/mi? 🤣🤣 Absolutely love the 3412! Gorgeous engine! Only problem I could see is you wouldn't need the bottom 6 gears. 🤣😍😍😍

[@ramonartavia4981]

This sound in low gears is nice

[@ericthiel4053]

Man that whistle in the engine when she gets up there....

[@G2Customs]

twin turbos singing

[@siam_g.d.s]

I'm not a truck driver or a mechanic but there was a very old generator powered by a Caterpillar D399 in a hospital. It was huge!!! Do you have any info on that engine? From what I saw...I could only tell its a v16 but thats all I know😅

[@G2Customs]

Yes, Caterpillar did make a D399 V16 turbo diesel engine. It was mostly used in marine/ship propulsion applications, and yes, there are quite a few that were used to power generators too

[@jimthiel478]

Brake saver sweet... Would love to see how it actually walks up say like sherman fully loaded for a comparison of other big kitties from the past

[@realmccoy9597]

Did you figure out the vibration? That's why Cody sold it, his step dad Dave built the truck himself.

[@G2Customs]

there was no vibration in it when I rode in it... we were just running bobtail... sold it to a guy in south Texas, I'm pretty sure he still has it

[@lorenaarzoladyche8932]

The guy still has the truck. He now has 3 D9's that he moves to locations with the truck.

[@barryrainbird]

Nothing beats a cat motor

[@hubertnicolas8020]

Beautifull sound

[@GJL216]

Pure Gold

[@monstersdad67]

I saw that truck listed for sale a couple weeks ago, I reckon You bought it 🤘🏻

[@G2Customs]

I am the guy who has it listed for sale. It's still available as of Nov 7,2021

[@Drakonniz]

@@G2Customs Hey, Matthew, could I get the information on what is necessary to put that 3412 in a Peterbilt 379, legally?? Thank you in advance.

[@G2Customs]

@@Drakonniz to be honest, it's not very practical. We didn't do it, it was commissioned by a company out of Colorado back in the late 90's. The only V12 that was ever put in a semi truck from the factory was a Detroit 12V71. This mechanical V12 CAT is a generator, big dozer or ship engine. The width, length, weight and torque specs require "engineering" to get it installed correctly. I'm not saying you/we couldn't do it, but I'm guessing the cost, including the engine, would be about $60,000 and that's not counting the torque retarder or transmission... I'm guessing that "all in" you would be looking at $100K

[@Drakonniz]

@@G2Customs I am aware of this, however, i still need the information for a project I am working on (its for PTSD therapy). Any information you could provided would be most appreciated. Heck, even photos if nothing else would be wonderful. I am designing a custom vehicle on paper as a project. That is why I am asking. You are the only source of information I can find at the current time.

[@G2Customs]

@@Drakonniz ok, first you have to remove the hood and replace both the top and side panels to extend it an additional 8 inches, or frame/rivet in an 8 inch aluminum extension... then remove all the mounts for the cab and sleeper. Disconnect all the hoses, wiring, air lines, A/C lines and steering shaft from the cab. Move everything back 8 inches. Remove the front suspension brackets. Remove the rear suspension brackets. Remove the fuel tanks and lines. Install a new c-channel steel frame insert end-to-end. Drill new mounting bracket holes in the frame (through the new c-channel insert) for the cab & sleeper, tanks and suspension brackets. Replace all the hoses, A/C lines, fuel lines and install or extend a new wiring harness. Install a new extended steering shaft. Remove the steps, move them back 8 inches. Extend the exhaust using 5" flex tube & clamps. Then measure twice and drill/mount new engine mounts... new transmission mounts... You're just about ready to bolt in a V12

[@jwwct7241]

Did trucks come with the motor option or this is custom? Where can I buy a truck with this motor ?

[@G2Customs]

No, the Caterpillar 3412 was never a factory option. The 3408 was the biggest CAT engine that was offered. This truck was custom built.

[@G2Customs]

Contact me if you want to buy a Peterbilt with a Caterpillar 3408 or the most popular engine is the CAT 3406... the 3406b is a legendary 14.6L mechanical diesel... the 3406e is the most popular version, more modern

[@jerrycoggin9434]

Just noticed the extension mod on the back of the hood.

[@G2Customs]

Yep, to accommodate this engine the cab was moved back 10 inches, re-mounted and an extra 10 inches of hood and bracing was added (on the cab side) of a normal Peterbilt extended hood... it's an EX-EXHD 😃😎

[@jwwct7241]

Nice truck

[@jerrycoggin9434]

I will be honest. I have never heard of a 3412. What was this engine originally purposed for?

[@G2Customs]

The majority of 3412 are found in marine applications, to power commercial ships, tug boats, barges, etc. Also power generation, i.e. the 3412 is often used to run a generator, a stationary application.

[@jerrycoggin9434]

I researched it a bit. Seems to be a might heavy for an over the road truck. I guess you would need a 20,000lb front axle along with the giant ass wide tires to handle the weight. I would enjoy an under the hood peak at this monster. I would think you would need to beef the frame up quite a bit also. What did you use for a drive shaft and running gear to handle torque?

[@marksmith801]

Hmm! Dual trailer brake handles? 😮🤔

[@G2Customs]

I think the second handle you are referring to the torsion brake lever, the dash mounted one

[@roaddawgrobbaker6644]

I never hear of 3412 ..3406 3408 is it n the 3400 series ..the 6 an 8 is cylinders..so that a 12 cylinder cat?

[@G2Customs]

Yes, it's a V12 twin turbo, one turbo on each side... usually you will find this engine in marine or generator applications... this truck is double framed and modified to accommodate the engine

[@roaddawgrobbaker6644]

@@G2Customs that's awesome..I been n trucking 21 year never seen that..I seen big cats n dozers yah kno ..man that's a mean set up...I got a c16 its a beast ..id love to pull with 1 of those....

[@ruxoneto6560]

​@@roaddawgrobbaker6644 No you wouldn't!!

[@LeeSchofield-gr4mq]

The 34 in the 3400 series cat is the bore / piston sleeve diameter. The last 2 numbers are the amount of cylinder s. 3404 has a 5.4 inch bore 4 cylinder s. A 3406 has a 5.4 inch bore 6 cylinder s. A 3408 has a 5.4 inch bore 8 cylinders a 3412 has a 5.4 inch bore 12 cylinders etc. Same with 3300 3500 and 3600 series engines they all share a common bore size (33 35 36 not 5.4 inches.)

[@jermainemorgan171]

Does it have jake break?

[@G2Customs]

No "jake brake" on a V8 or V12, BUT... this one has an three stage torque retarder on the drive line and an after turbo exhaust brake

[@beeteekay9117]

Thanks mammaw

[@jimbradd2783]

Yes they all go fast when there's no trailer hooked to them

[@G2Customs]

LOL, yeah, this beast rolls up to 70 mph without blinking... and 😃 pulls a 100,000 lbs like a normal Pete would pull 40,000 lbs... speed ain't the big feature here 😁😎

[@nevinkuser9892]

I also want a $500 oil change.

[@G2Customs]

😉 When you get paid $9/mile to haul heavy, which is what this truck was designed for, then $500 for an oil change is pennies! 😃😁😎

[@WillMay-fr9ps]

​​@@G2Customsbig money

[@TheInvincibleOne-t3v]

why not float?

[@G2Customs]

Dude, he hit the clutch once in this video... and, if you think you, or I should tell Hank how to drive, then you are delusional... Hank is 80 years old, he's been driving big rigs longer than you & I put together... Hank knows how to safely shift a truck... guaranteed, he's not concerned about looking cool floating gears

[@TheInvincibleOne-t3v]

@@G2Customs did i offend you or stumbled you in any way, with my comment?

[@raypeoples]

@@G2Customs Hank has probably backed up more miles than a lot of wheel holders have gone forward

[@timmiryan4721]

😻

[@chewtoy6669]

You need an over weight permit just for the steer axel. LOL😂

[@f-j-Services]

I only assume this is extended hood too? haha.

[@G2Customs]

@@f-j-Services extended hood WITH a 10" inch extension 😁😎 looooong hood 😃

[@f-j-Services]

@@G2Customs Oh damn. I figure the frame is modified a good bit haha. Double thick frame too I assume?

[@RS-cb7nm]

We didn't see the engine!

[@G2Customs]

I have quite a few still pictures of the engine... I'll try to put together a slide show... I might be able to get a video of the engine running, but we sold the truck so 🤷

[@RS-cb7nm]

@@G2Customs that would be sweet.

[@G2Customs]

@@RS-cb7nm I uploaded a slide show video... I'll see if I can get a live video of the V12 running

[@RS-cb7nm]

@@G2Customs 👍

[@shortthrow50]

Not a single gear was found that lol. If you put your foot into the accelerator a little more instead of pussy footing, you will find the gears as you need them

[@G2Customs]

Ooook super driver... first, Henry did not miss a single gear 😃 AND in less than two minutes we went from 20 mph to 75 mph as smooth as butter... this video was not an attempt to "hot rod"

[@StanleyBlack-xf3hv]

The truck would be over weight on the steering with just the truck

[@G2Customs]

@StanleyBlack-xf3hv naw, the front axle is upgraded, rated at 16K - 20K depending on which tires you run. That engine is heavy, but nowhere near overweight

[@EngelmanRanch-h5e]

What’s the gallons per mile?

[@michaelwhite6112]

No jake

[@G2Customs]

No Caterpillar V12 has a "Jake Brake"... a Jake Brake is only on the inline 6 cylinder diesels. This engine has an exhaust retarder, but, much more effective for braking is the torque retarder that is mounted on the driveline behind the transmission in this truck