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Tow Rigs, Trailers, and Other Tech Discussion Have a Tech question NOT related to an XJ or MJ? Have Tow Rig or Trailer questions? This is the place to get help.

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  #16  
Old March 10th, 2012, 15:01
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collkid collkid is offline
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Re: Duramax vs Old J20

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Originally Posted by Egodfrey View Post
I also just always wanted a j20...
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Originally Posted by Egodfrey View Post
Because i always wanted a j truck.
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Originally Posted by Egodfrey View Post
I have just always liked the old j trucks. I really want one
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Originally Posted by Egodfrey View Post
I really want a j20, always have.

Do you want a J truck or not, I'm a little confused..
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  #17  
Old March 10th, 2012, 16:01
POSJ POSJ is offline
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Re: Duramax vs Old J20

Get the D-max and be done with it...I sold my 07' 3500 Dmax and I regret it everyday. It was way better than my Cummins and I am currently trying to find another because I fuct up and sold it...
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  #18  
Old March 10th, 2012, 16:09
XJLI XJLI is offline
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Re: Duramax vs Old J20

i love J trucks too, but there is something to be said about having something new and RELIABLE bc all the parts bolted to it were meant to be there from the factory.
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  #19  
Old March 10th, 2012, 19:41
Egodfrey Egodfrey is offline
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Re: Duramax vs Old J20

I see your point xjli.
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  #20  
Old March 11th, 2012, 09:12
twodoorXJ twodoorXJ is offline
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Re: Duramax vs Old J20

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Originally Posted by XJLI View Post
Gonna be a dd? Get a duramax. There's nothing nicer in the world than having a normal, reliable, car to to drive every day.
I would like to experience this one day.
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  #21  
Old March 11th, 2012, 09:28
XJLI XJLI is offline
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Re: Duramax vs Old J20

i know its like being a normal human being.
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  #22  
Old March 11th, 2012, 10:55
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kastein kastein is offline
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Re: Duramax vs Old J20

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Originally Posted by XJLI View Post
i know its like being a normal human being.
overrated.
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Please do not PM me about the AW4 info thread unless you have a truly unique question that is not covered by it or info to add. I do not respond to questions answered by the thread.
Definitely do not hunt down my phone number at 3AM, text me about it, and then threaten violence when I am not helpful. It will not get you what you want.
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  #23  
Old March 27th, 2012, 09:03
altrocker1 altrocker1 is offline
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Re: Duramax vs Old J20

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Originally Posted by XJLI View Post
i love J trucks too, but there is something to be said about having something new and RELIABLE bc all the parts bolted to it were meant to be there from the factory.
until your new injectors clog or your computer goes down...mechanically injected diesels are definitely reliable and would be far easier to work on for the average joe.

that being said, a 6bt swap is not a bolt in affair for a j20...search ifsja for a 6bt swap info. if you are going to tow with it you will need stronger axles on a 6bt. and you will need to reinforce the frame. there will be some cutting/trimming on the firewall and front clip as well. it has been done quite a few times successfully, just depends on how involved you get. a 4bt or and isuzu 4bd1t is a much better fit for a jtruck and you can use your stock axles...again far from bolt in, and maybe not enough motor in some situations. a turned up version of a 4cyl diesel is capable of good hp and torque numbers though, you would be pushing egt's hard towing up and down a lot of hills with a turned up 4cyl...

that being said, mileage wise there are guys pulling 25-30mpg with a 4cyl diesel in a jtruck. it all depends on gears, tranny and tire size...

im in the process of restoring a j10 so i can put an isuzu 4 banger in it. its a slow build, but if i put it together...then i will know how to fix it
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  #24  
Old March 27th, 2012, 11:31
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kastein kastein is offline
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Re: Duramax vs Old J20

Make sure you write down the part numbers and/or part applications (make/model/year etc) for everything you use in the swap... you don't want to be broken down somewhere going "did I use a chevy master cylinder or a dodge? Was it a 2500 or a 3500? craaaaap"
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My yard looks like Sanford & Sons.
Please do not PM me about the AW4 info thread unless you have a truly unique question that is not covered by it or info to add. I do not respond to questions answered by the thread.
Definitely do not hunt down my phone number at 3AM, text me about it, and then threaten violence when I am not helpful. It will not get you what you want.
CTeunuch: Sometimes I really wonder if this sport makes you insane, or it just attracts the mentally unstable.
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  #25  
Old March 27th, 2012, 12:52
altrocker1 altrocker1 is offline
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Re: Duramax vs Old J20

absolutely...when are you going to come to iowa to help me ken??? i could drag it out there on a trailer and you could just build it for me
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  #26  
Old March 27th, 2012, 13:33
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kastein kastein is offline
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Re: Duramax vs Old J20

if you pay for fuel I'm totally down for that, it probably wouldn't be worth it though.
__________________
My yard looks like Sanford & Sons.
Please do not PM me about the AW4 info thread unless you have a truly unique question that is not covered by it or info to add. I do not respond to questions answered by the thread.
Definitely do not hunt down my phone number at 3AM, text me about it, and then threaten violence when I am not helpful. It will not get you what you want.
CTeunuch: Sometimes I really wonder if this sport makes you insane, or it just attracts the mentally unstable.
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  #27  
Old March 30th, 2012, 17:00
altrocker1 altrocker1 is offline
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Re: Duramax vs Old J20

the drivetrain that im going to get will probably be coming from pennsylvania....so ill be out that way any how. i'll just drop it at your house when i pick it up
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  #28  
Old March 31st, 2012, 13:24
Renegade XJ Renegade XJ is offline
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Re: Duramax vs Old J20

The amount of money it would take to build a Jtruck to tow somewhat comparable as a newer diesel truck would not justify doing it. Not to mention, everybody says "if its done right, and I take my time, it should be reliable" BS. Custom stuff is never ever ever as reliable as something that a multi million dollar auto company, that has crew's of engineers, testings facilities, and spend years developing a single car can be. You WILL have issues with a custom ANYTHING that is going to be put to tow and be a DD. Yes you will have a cool truck, but when your buddy flys buy you in his GM/Ford/Dodge diesel as your sitting on the side of the road because something is acting weird and you cant figure it out.....your truck wont be so cool anymore.

Buy a J20, restore it and drive it on the weekends, or build a beater and go 'wheel it on the weekends. But buy yourself something thats going to take you to work and back and haul the toys around on the weekends and never give you an issue....if it does, take it to the dealer and have the warrenty take care of it....or at least you can go to the local parts store and get whatever you may need for it and have it be in stock.
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  #29  
Old March 31st, 2012, 20:20
Haulin Haulin is offline
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Re: Duramax vs Old J20

Duramax vs Cummins, well I have had them both. So comparing apple to apples I will compare my 06 LBZ Duramax to my 07 Cummins 5.9.

Injectors failed, 6 on the Cummins 0 on the Duramax.
Transmission issues, too many on the Cummins 0 on the Duramax
Times stranded, 4 on the Cummins (multiple nights in a hotel) 0 on the Duramax

Overall reliability, Duramax/Allison hands down
Fuel economy, close but slightly better on the Duramax

My Dmax had 285,000 on it when I traded it. I was lured over by the MEGA cab. I ran the Cummins for 394,000 it just left a month ago.

Now some things you need to know about the Duramax. The original to 04 was an LB7 engine and was an injector eating monster. Next came the LLY 04.5 to early 06, good engine but did have a small number of people that had overheating isssues. 06-mid 07 was the LBZ, best engine in my opinion, after this you venture into more emission controls. 06 and up also get the 6 speed Allison.

Now back to the Cummins, if you stay pre common rail (02 and older) now were talking. I've had 6. 2 24 valves and 4 12 valves. Downfall of ALL of these (except the NV5600 6 speeds) are the transmissions. Big weak link. One other weak link is the lift pump, if it fails it can kill the injection pump, an aftermarket lift pump like the Airdog solves that.

It all comes down to money 15k and up a Duramax LBZ, you'll spend well over 20k for lower miles. Under 15k and you can get a nice 2nd gen Dodge, and if your not afraid of miles 10k can buy a decent 2000 or so.

My next toy towing rig will likely be a NV5600 equipped 2000-2002 Dodge in the 10k range. Just can't justify the 20k for a toy towing rig.

Last edited by Haulin; March 31st, 2012 at 20:24.
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  #30  
Old March 31st, 2012, 21:31
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5-90 5-90 is offline
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Re: Duramax vs Old J20

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Originally Posted by kastein View Post
Get the J20 and put a 6BT in it!

Got a J20 in mind? If you decide not to buy it I want to see it.

I tow with a 318 right now, it full on SUCKS on hills but does decently otherwise. Definitely wouldn't choose to do so voluntarily, but the price was right.
Seconded!

I'd love to get a pre-smog J20 chassis, throw a pre-smog 6BT (mechanical injection,) pair it up with a 47RE (standalone controller,) and set it up to run on Diesel, greasel, or WVO (two fuel tanks - one for Diesel/greasel only, one for WVO.

Or maybe pair it up with an NV5600 - I prefer manuals anyhow.

(Kinda like how I'd like to get an old M113 surplus chassis, fit it out to make it road legal, put it on a heavy diet, and give it a pair of 6BTs. Set up the greasel processing in the back, and pump out fry tanks on my way around the country... I think a Gavin chassis would make a damned decent travel rig, with a good refit.)
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