D44's with a diesel

For everything related to converting and up keeping diesel engines in an FSJ
Post Reply
User avatar

Topic author
Grand_Wag_85
Posts: 1596
Joined: Sat Aug 27, 2011 8:46 am

D44's with a diesel

Post by Grand_Wag_85 » Tue Jul 17, 2018 8:25 am

Planning on doing a Duramax swap into a GW to be a DD/tow rig. Will the D44's live behind the diesel? Stock height, stock tires, stockish LB7 or LLY with auto trans.
82 J10 65 J2000 77 J10 Golden Eagle 88 GW

You know it's bad when your car is on the EPA's 10 most wanted list!

User avatar

Stuka
Site Admin
Posts: 9219
Joined: Thu May 12, 2011 5:53 pm
Location: Sonora, CA
Contact:

Re: D44's with a diesel

Post by Stuka » Tue Jul 17, 2018 9:45 am

For daily driving the rear D44 would be perfectly fine (towing/hauling is where issues may come up). My concern would be the longevity of the front D44 with the extra weight on it. Ball joints may become a common replacement item.

And one thing to note, I don't think the engine will fit without a lift because of the axle to pan clearance. Stiffer springs would be wanted anyway to deal with the weight. But you can cross that bridge after the engine is in and you can check clearances.
1981 J10 AMC 258 with HEI and Weber 32/36 DGEV Carb, T176, NP208, D44/M23 with 4.56 gears and Detroit Locker, 6" lift, 33x12.50 Cooper STT's, BJ's Offroad Rear Dozer Bumper.
2017 JKU Rubicon Lifted and stuff
Pevious Jeeps: 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ

User avatar

dodgerammit
Posts: 842
Joined: Wed Jan 11, 2017 11:20 pm
Location: Middle TN

Re: D44's with a diesel

Post by dodgerammit » Sun Jul 22, 2018 2:03 pm

Stuka wrote:For daily driving the rear D44 would be perfectly fine (towing/hauling is where issues may come up). My concern would be the longevity of the front D44 with the extra weight on it. Ball joints may become a common replacement item.
This. Having been on a Dodge truck forum, there have been plenty that have put a Cummins 12 valve (1200#ish) over a 44 with no issues even after a couple years in. However, the weight rating would concern me since a 44 is rated at 3500#. I would also say it depends heavily on the quality of balljoints in the axle.
84 Grand Waggy-Radio Flyer (Garnet Red/3M Ebony Metallic woodgrain, with tan interior) AMC 360/727/229 TFI conversion, MSD streetfire ignition, D44/AMC20 Serehill tailgate and headlight harnesses :fsj:

User avatar

derf
Posts: 1395
Joined: Mon Jun 04, 2012 9:10 am
Location: Littleton, CO
Contact:

Re: D44's with a diesel

Post by derf » Mon Jul 23, 2018 12:50 pm

They might live for a while but if I was going to the trouble of doing a swap with a big heavy diesel I'd be researching heavier duty axles than factory stock.


Nikkormat
Posts: 3605
Joined: Sun Jun 29, 2014 11:45 pm
Location: Missoula Montana

Re: D44's with a diesel

Post by Nikkormat » Mon Sep 24, 2018 1:11 am

Put a 4cyl diesel in it to save weight, and pull 30+ MPG out of a Waggy.
Gabe, "reformed" Jeep hoarder.


Adventure_Wagon88
Posts: 441
Joined: Tue Sep 06, 2016 2:00 pm
Location: Leesport, PA
Contact:

Re: D44's with a diesel

Post by Adventure_Wagon88 » Mon Sep 24, 2018 4:01 am

Nikkormat wrote:Put a 4cyl diesel in it to save weight, and pull 30+ MPG out of a Waggy.
What 4 cyl diesel would do that? Do you have any evidence to support this? I’m doing a 3.9 L diesel in my Waggy and expect maybe 19-22 MPG. I’ll be thrilled if I can squeak 25 out of it empty. Even if I was running stock tires I don’t think it would break 25 easily. I’m doing a TDI 1.9 in my XJ and that I expect to be right around 27-32. I’m just not sure 30+ is realistic with any engine in a Wagoneer due to weight/size/aerodynamics


Adventure_Wagon88
Posts: 441
Joined: Tue Sep 06, 2016 2:00 pm
Location: Leesport, PA
Contact:

Re: D44's with a diesel

Post by Adventure_Wagon88 » Mon Sep 24, 2018 4:06 am

I went through this same phase of questioning for my build. What it came down to for me was weight on the front axle, and towing. I just didn’t want to have to worry about the axles all the time. You have to look too at what the factory engineered too. There are no 1/2 ton rated Duramax trucks. You’re only going to find them paired with a very stout full float 1 ron rear. Even if you don’t want your Wag to be much bigger, I’d plan on running a set of tons and a tire size you’d find on a stock duramax truck which will be a little bigger than the OEM wagoneer tire, probably around 31-32.5” tall. You can fit that with minimal lift/trimming.


Locked and Loaded
Posts: 458
Joined: Wed Oct 03, 2012 7:57 pm

Re: D44's with a diesel

Post by Locked and Loaded » Mon Sep 24, 2018 4:43 am

I'd be more worried about the frame.
Drink more Water


230ohc
Posts: 325
Joined: Thu Jun 16, 2016 2:27 am
Location: Northern California

Re: D44's with a diesel

Post by 230ohc » Mon Aug 26, 2019 9:50 am

There are 1/2 ton diesel options, that however excludes duramax, Cummins and powerstroke.
The 1/2 ton options may only result improvements in fuel economy, but so will an LS swap.
I know someone who is doing powerstroke on an early 60's international truck where he essentially is only using the bed and body mounted over a 2005ish 7.3 chassis with a shortened frame and custom rear drive shaft.
zero worries about what will or won't work.
This may be an alternative pursuit to my current diesel conversion.
1964 willys wagoneer
Om617 turbo diesel
T18 granny
Dana 20
3.73 dana 27 front
3.73 dana 44 rear


rocklaurence
Vendor
Posts: 1585
Joined: Sat Mar 30, 2013 6:53 am

Re: D44's with a diesel

Post by rocklaurence » Wed Aug 28, 2019 1:11 pm

A 1200 lb motor over the D44 knuckles is too much.

User avatar

Stuka
Site Admin
Posts: 9219
Joined: Thu May 12, 2011 5:53 pm
Location: Sonora, CA
Contact:

Re: D44's with a diesel

Post by Stuka » Wed Aug 28, 2019 3:25 pm

I just noticed the OP also said stock tires. Which being they are a 15" wheel will be Load Range C, which also won't handle the weight.
1981 J10 AMC 258 with HEI and Weber 32/36 DGEV Carb, T176, NP208, D44/M23 with 4.56 gears and Detroit Locker, 6" lift, 33x12.50 Cooper STT's, BJ's Offroad Rear Dozer Bumper.
2017 JKU Rubicon Lifted and stuff
Pevious Jeeps: 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ


rocklaurence
Vendor
Posts: 1585
Joined: Sat Mar 30, 2013 6:53 am

Re: D44's with a diesel

Post by rocklaurence » Fri Aug 30, 2019 11:28 am

Allison transmission will probably need floor clearance

User avatar

Mass
Vendor
Posts: 21
Joined: Tue Dec 04, 2018 6:15 pm

Re: D44's with a diesel

Post by Mass » Sat Sep 07, 2019 3:49 pm

Old thread with recent posts..
I'm running D44's with a stock 6bt.
No issues yet and it's been about 4 years. No ball joints or broken parts (yet). I do have a 4" lift though.
I don't think the added 200-300ish pounds per side makes a huge difference for how I drive.
I also don't do any crazy off road/rock bouncing crap or tow more than 3,000 lbs (The frame is what I worry about)
It's all about the mileage, WMO, and reliability :)
89' GW 6BT Cummins


Mikel
Posts: 31
Joined: Mon Mar 25, 2013 6:26 pm
Location: CT

Re: D44's with a diesel

Post by Mikel » Tue Oct 29, 2019 11:04 am

Adventure_Wagon88 wrote:
Mon Sep 24, 2018 4:01 am
Nikkormat wrote:Put a 4cyl diesel in it to save weight, and pull 30+ MPG out of a Waggy.
What 4 cyl diesel would do that? Do you have any evidence to support this? I’m doing a 3.9 L diesel in my Waggy and expect maybe 19-22 MPG. I’ll be thrilled if I can squeak 25 out of it empty. Even if I was running stock tires I don’t think it would break 25 easily. I’m doing a TDI 1.9 in my XJ and that I expect to be right around 27-32. I’m just not sure 30+ is realistic with any engine in a Wagoneer due to weight/size/aerodynamics
I know someone with a 4BT in a Wagoneer (lifted) and he gets 22MPG.

My M715 hybrid (4BT with 1ton drivetrain) gets about 18MPG.

User avatar

eggman918
Posts: 58
Joined: Wed Apr 15, 2015 11:01 am
Location: Northern Arizona

Re: D44's with a diesel

Post by eggman918 » Thu Oct 31, 2019 6:54 am

After a overhaul and compounds I have been averaging 17 +/- .5 over the last 30,000 miles this is in a tall truck that weighs 8,000 unloaded and in a state where 75 is the interstate limit..........$.02
1967 Wagoneer soon to be TDI powered
1968 F-250 CrewCab Cummins 4BT, ZF-5, NP 203/205,TruTrac's front/rear.

Post Reply

Who is online

Users browsing this forum: No registered users and 1 guest