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  #1  
Old 11-03-2005, 11:17 AM
Karl Streich Karl Streich is offline
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Post 6.2/6.5 Chevy GM diesel owners...

I'm planing a swap and interested in any information you have on the swap, how you did it, fuel economy, and how/if you did anything to the front springs to deal with the diesel weight.
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  #2  
Old 11-03-2005, 11:27 AM
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Crazy_Jeepman Crazy_Jeepman is offline
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What does the GM diesel weigh? For my Cummins swap the springs I am using are a 3 leaf pack out of a J20 with a GVW 8400 LB. They will need some help, so I am going to use airbags.
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Old 11-03-2005, 11:31 AM
FSJeeper FSJeeper is offline
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Quote:
Originally posted by Karl Streich:
I'm planing a swap and interested in any information you have on the swap, how you did it, fuel economy, and how/if you did anything to the front springs to deal with the diesel weight.
Super simple swap. These engines use all the SBC/BBC motor mounts and bellhousing bolt patterns. Electrical is easier than a gas motor swap. The GM diesel weighs about as much as a BBC so only about 250lbs more than an AMC V-8. Stock J-20 spings work well if you want stock lift, and if not, any of the other lift springs will work OK with the GM diesel.

My built 6.2 that has every imaginable mod to it in a 7500lb M715 got 21 MPG not towing. The 6.2 EPA mileage in the Blazer was 29 mpg.

The GM diesel is a light duty unit and no way compares to the Cummins 4BT or 6Bt of which I am very fond of. However, if you build it right, it will do well for you. You can get 250 to 300HP and 420 to 520 ft lbs at below 2000 rpms out of these fairly easily but it costs to do it.
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In Process: 91 Wagoneer, D61/71 axles with 3.07 gearing, NV4500, NP205. Cummins 6BT.

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  #4  
Old 11-03-2005, 04:59 PM
Karl Streich Karl Streich is offline
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I can see 29mpg with an overdrive and 55mph of the 80's, but I'd be happy with 20mpg, I considered the navistar, but the 6.2/6.5 will bolt up to a chevy pattern TH400, then a quadratrack with the jeep output shaft, so I can keep it mostly stock. This isn't a tow rig and I don't want to break my drivetrain so I don't want to tweak it too much, I have an F250 and an F350 dually for that. The front springs will be 4" lift with 33" tires, hopefully regular lift springs will do, even if they are compressed an inch.

I also found the navistar/cummins 5.9 was just too heavy for my taste and the extra beef is not needed for this application.
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  #5  
Old 11-03-2005, 05:12 PM
GWJoe GWJoe is offline
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FSJeeper: I keep seeing posts for this swap, the 6.2 but I am still not quite sure how everything would work out such as wiring, sensor install, etc. etc. Is there a "6.2 Diesel Swap For Dummies" guide somewhere. I would be interested in doing this and could get the equipment that I need, I just need some guidance.

My first step would be in finding/selecting a good donor engine, what to look for? Then should I rebuild or have it rebuilt or is there some way to tell that it would be fine without a rebuild?

Sorry if this is the 800th time you've heard these questions.

Also, you said something about this would work with any of the other lift springs. So, if do a two inch lift all the way around, will the front sit lower than rear due to extra weight? If so, how to make sit level?

Joe
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  #6  
Old 11-04-2005, 02:44 AM
FSJeeper FSJeeper is offline
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Quote:
Originally posted by GWJoe:
FSJeeper: I keep seeing posts for this swap, the 6.2 but I am still not quite sure how everything would work out such as wiring, sensor install, etc. etc. Is there a "6.2 Diesel Swap For Dummies" guide somewhere. I would be interested in doing this and could get the equipment that I need, I just need some guidance.

My first step would be in finding/selecting a good donor engine, what to look for? Then should I rebuild or have it rebuilt or is there some way to tell that it would be fine without a rebuild?

Sorry if this is the 800th time you've heard these questions.

Also, you said something about this would work with any of the other lift springs. So, if do a two inch lift all the way around, will the front sit lower than rear due to extra weight? If so, how to make sit level?

Joe
OK, engine mounts, Advance Adapter, Novak, and Trasdapt make Chevy to FSJ adapter mounts. Simple as pie to install. The 6.2 clears everything fine but you do have to work with it. Fuel, hook your fuel tank line up to the fuel pump of the GM diesel. The GM line goes into the engine on the opposite side as the FSJ, so a little plumbing there but no big deal. Electrical is easy. You have one keyed power line going to the injector pump and starter relay. You'll also have to set up a circuit for the glow plug relay and a mometay push switch, but once agin, very, very simple. There are wires for the sensors such as oil presseru and temp that need to be hooked up but I am pretty sure your FSJ gauges will work with the GM diesel. You'll need a very HD radiator with GM inlets and outlets which are opposite of the FSJ radiator. You can buy very good Chevy FSJ radiators from several places. The GM diesel cools its oil in the radiator so you'll need to make sure you have a provision for that or devise some other oil cooler. If you go turbo, you'll have to mod your drivers side inner fender well to clear the turbo housing.
(Mine is a custom Banks turbo, not sure if the GM turbo has this issue.) Use a GM T400 case and put your mainshaft and qtrac adapter in it. Trans mount, driveshafts etc. should not have to change unless you want to relocate the engine for whatever reason.
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In Process: 91 Wagoneer, D61/71 axles with 3.07 gearing, NV4500, NP205. Cummins 6BT.

Back burner project: Crew cab M715, Cummins/Allison/Rockwell Tcase/Dana 61/Dana 71.
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  #7  
Old 11-04-2005, 03:12 AM
Karl Streich Karl Streich is offline
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GWJoe- Look here, I started a thread about what engine to use.

http://www.thedieselplace.com/forum/...ad.php?t=50201
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  #8  
Old 11-04-2005, 07:26 AM
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Jonathan M. Jonathan M. is offline
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http://www.peninsulardiesel.com/
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  #9  
Old 11-04-2005, 08:07 AM
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ohioj20 ohioj20 is offline
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Here is what I posted a while back on our swaps..... email if you have questions. This was posted before my J20 got T-boned. My dad's GW is almost complete with a 6.2 diesel and a TH 700

Alright guys!! I'm in NE Ohio, close to Akron. The J20 got her 6.2 two years ago. It came from a 1984 GMC Van. It had the TH 700 tranny, but I didn't have the money to buy an adaptor for it to my t-case.

Alright, we removed all the electrical wiring that was for the engine, glow plug wiring, wait to start light, water in fuel light, etc. I also used the motor mounts, but had to make new frame mounts to put on the J20. We used the ignition wiring for the J20. Oh, took out the glow plug relay also. Wiring wasn't that bad, and no polution crap to worry about. The motor fits in snug around the heater box and the brake booster. We did use the Jeep brakes, as GMC uses hydrulics for brakes, but wouldn't hurt to have a belt driven vaccuum pump as well as the gear driven one.

Now, the 6.2 has the same bellhousing as a Chevy 350, as for the bellhousing a bought from a bone yard was for a 350. Now, we had to get an 1/4" steel plate to make our own adaptor for the bellhousing and the T-18. Luckily my cousin is a true machinist. So, that saved the money from Advance Adaptors, which want $300 for the same thing.

The great thing is, I can access the glow plugs from inside the fender, and it is ALOT easier than changing spark plugs from a AMC 360!!

As for how I like it. I LOVE it when it is above 45 degrees out! If you don't plug it in when it gets colder, it is a pain to start. Also, you don't have the room for the two batteries GMC uses. Need to get the biggest cranker you can squeeze in there.

I also had to use the van's filler nozzle, or you couldn't fill the truck up with the stock jeep nozzle. I also had to cut out the area into the tank, to allow a bigger pipe to go in(diesel foams when filling). Another perk, I put in the van's 30 gallon tank where my spare tire goes, so I now have 48 gallons at 22 MPG, you do the math!

Towing: It doesn't take off like some madden woman, but tows great. It did get hot on a real long grade, but didn't over heat. I also used the stock AMC 3 core on it, just had to get the ports changed. I would recommend a 4 core, that is what I have for the GW. I also bought an electric exillery fan to use to prevent that on the J20. The gearing in the J20 and the T-18 is perfect for a 6.2 I will get pictures of the set up soon, the J20 is covered up for the Winter so Ohio Salt doesn't eat her up!

Now, the GW is a work in progress, I have the motor, but I am currently in the process of body work and paint. My plan is to use the TH 700 from the van, but I got a TH 400 that came with the Suburban for the GW. My only concern is the weight of the motor on the front axle of the GW.

Now, if I left anything out, let me know or feel free to ask more! E-mail me if you want at piakp@yahoo.com
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  #10  
Old 11-04-2005, 01:08 PM
GWJoe GWJoe is offline
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okay, so I want to save this thread to my computer for later reference. How do I do that?

thank you guys this is very helpful

Joe
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  #11  
Old 11-05-2005, 12:14 PM
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The PIG Smith The PIG Smith is offline
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ohioJ20,

Are you gonna repair your J20 or is now a donor for your GW?
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2005 Grand Cherokee Limited - HEMI! Current Daily Driver
1982 J10: Current Project, goal to be roadworthy in 2017: No Cab Brow!
1981 J20: Commercial flat bed. Long term Project: RUST! No Cab Brow!

Quote:
Originally Posted by Jayrodoh
...but if it works, I wouldn't touch it.
Quote:
Originally Posted by Lindel
Best laid plans, yada yada yada...
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  #12  
Old 11-05-2005, 02:00 PM
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ohioj20 ohioj20 is offline
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Bryan,

I am going to repair my J20, I bought a J10 to use the cab/frame. It won't be for another year though. However, my dad is 75% done with his GW and we will then work on my GW. Both, or alteast his, will be done in the summer if you want to try and have the meet like we planned.
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  #13  
Old 11-05-2005, 11:41 PM
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im definately interested in a meet,still. keep us advised as to when your rigs are done and when you have free time [img]smile.gif[/img]
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  #14  
Old 11-06-2005, 12:51 AM
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ohioj20 ohioj20 is offline
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Will do
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  #15  
Old 11-06-2005, 12:58 AM
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ohioj20 ohioj20 is offline
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Karl, there is also a fellow on here, from California, I think that put a 6.5 turbo in his GW.
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1982 Jeep J10 body going on 1991 Dodge W250 frame with a Cummins and 5speed
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  #16  
Old 11-06-2005, 03:13 AM
Karl Streich Karl Streich is offline
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ohio- I'd love to find him and find out when he made the convertion, and where he got it blessed.
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  #17  
Old 11-06-2005, 03:47 AM
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The PIG Smith The PIG Smith is offline
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Yes, I was bummed about not meeting back in the summer.
We should gotten together just to chat, even thought we had nothing to look at.
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2005 Grand Cherokee Limited - HEMI! Current Daily Driver
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1981 J20: Commercial flat bed. Long term Project: RUST! No Cab Brow!

Quote:
Originally Posted by Jayrodoh
...but if it works, I wouldn't touch it.
Quote:
Originally Posted by Lindel
Best laid plans, yada yada yada...
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  #18  
Old 11-06-2005, 10:05 AM
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ohioj20 ohioj20 is offline
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here is the guy:

DieselSJ

Gear Head

Member # 4928

posted July 19, 2005 02:23 PM
--------------------------------------------------------------------------------
6.5L GM diesel with a big 'ol nasty turbo, 700R4. Exhaust manifolds, cross-over pipe, down-pipe and turbo housing just came back from getting ceramic coated. Pics soon...

-------------------
Mark

87 Grand, 6.5L diesel, MHI TE06H turbo, Detroit Diesel single plane intake, Art Carr 700R4. Looking for an intercooler and other goodies. Needs a lift and tires...

81 CJ5, Bowtie 350, T176, 30, 20, 300, small lift, 33's. Big gas tank, WT 30, custom port EFI system collecting dust on the floor until the Waggy is done.

Dune buggy - details to follow. WTF was I thinking?

--------------------------------------------------------------------------------
Posts: 593 | From: Back in San Diego!!!!! | Registered: May 2003 | IP: Logged
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  #19  
Old 11-09-2005, 10:01 AM
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DieselSJ DieselSJ is offline
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That is me! PM me and I'll share everything that I know. I just posted about the progress of the swap.

http://www.ifsja.org/ubb/ultimatebb....c;f=2;t=037289

Avoid Peninsular - they are WAY expensive for what they have. For lots of great 6.2/6.5 info, go here - http://www.thedieselpage.com/ - and join their forums. That has been absolutely my best source for information.

Mark

[ November 09, 2005, 04:05 PM: Message edited by: DieselSJ ]
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  #20  
Old 05-30-2009, 07:11 PM
Karl Streich Karl Streich is offline
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Finally! I picked up a 1984 Chevy 20 with a good 6.2 a couple days ago, split it with a friend, $250 each, and he'll give me his old TH400, use the 4 speed out of this truck, I get 4 more alloy wheels for my 2001 Chevy and a 6.2 for the Cherokee, not bad for $250!
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