NV5600 coming out G56 going in

[Shadrach]

I did several searches but didn't find the answer I wanted. Has anyone actually replaced a NV 5600 with a G56 in a 3rd gen? ( Let's not get into which is " better " ). Drives shafts will need to be modified - that's easy, clutch will need to be changed - again easy. What about the cross member? Any thing else I need to know ? Shadrach

 

[Hercules130]

i was thinking about doing the opposite. You still have your 5600?

 

[Grizzly]

No way I'd give up my NV5600 for a G56.

 

[Cumminsduallyguy04]

I dont have experience with 5600 to g56 but I went from 48re to g56. I simply sourced shafts and transfer case from an 06 dodge. I couldnt find used t-case (g56 has bigger output than 48re) and figured if im gonna spend the money on new tcase than Im ditching radio knob 4wd with push button neutral. I bought a used adapter on ebay for the engine to g56. they turned out to be the same between 2004 truck 48re and the 2006 truck g56, so my best guess is the nv5600 with work with the existing adapter on the engine already. As far as the crossmember went for the 48re to the g56 swap the only thing i did was turn it around backwards and use the other set of slotted bolt holes already on the crossmember.



I did all of the mechanical parts of the swap and it looks oem with exception to the steering column (800 bucks i didnt want to spend). My only problem was I sent the truck to a shop familiar with engine conversions they have a buggy with a 4. 7 and they did it before a kit even was released. I figured if they could do that they could do the dumb little electrical work. I specified pruchase new harnesses and they hacked my stock ones. I had them modify an extra harness to an extended cam sensor harness. that only last 1 month before i had an issue and removed it. The rest of their work only lasted 2 months before the truck died way back in my hunting property in a 12" deep mudhole while i was in 2nd gear in low range towing a camper (no splash to wet electronics). after 3 hrs of winching the truck started and drove the rest of the way out. drove it home. took my gf out for lunch next day and got towed home again. the truck never really was right it had alot of defueling going on and I could not dump the clutch without it dangerously defueling (ever tried to cut across the highway and your truck just bogs out and u got a semi doing 55+ coming at you scary) truck has be drug from backyard to front yard a few times in past last year. now im pulling engine out redoing all the electrical stuff myself, cam, headwork, turbo, injectors, etc and driving it again. within next 2 months i hope.



word of advice if you need to hack your harnesses buy new.

 

[Shadrach]

The 5600 is still in the truck - for now - and the clutch needs to be replaced anyway. ( the engine is out getting rebuilt ) I bought all the necessary pieces to put a G56 in my 1st gen new from Dodge so I figured I would use in it my " new " truck. I don't really have anything against a NV5600, other than the fact they don't make them anymore, and the fact it has 356000km ( 221000 miles ) on it. Shadrach

 

[CoastyAV8R]

I don't know if I would go through all the trouble to go from a proven 6 speed to another but I don't think Shadrach has to deal with the same stuff as Cumminsdually did since he's not having to deal with the different software/electrical hurdles since he's not switching from an automatic to a stick.

If it were me doing the swap, I would try to find a truck with a G56 in it and just start measuring your brains out and take some photos so you can really study the differences...

 

[Shadrach]

Well the G56 is in and the truck is running although not on the road just yet. I had to drill new holes in the xmember for the new trans mount. It was a little tricky as there is not enough room to stick the mount in when the xmember is installed. Once we had measured where the holes needed to be we dropped the xmember and drilled the holes, installed the mount and put the xmember back in and then put the bolts in the trans housing. There is not much room. The xmember doesn't go straight up. It has to go into one side of the frame brackets then the other.



No floor mods are required. You will need the trans, adapter to block ( depends on year of truck ) shifter, boot, the button for the knob ( the knob and nut are the same ) and the wiring harness for the back up light plug. The rear drive shaft need to be lengthened by 1. 5" and the frt shortened by the same ( my truck is a 4X4 ). The transfer case bolt right up. I running a NV273 , the one with electric shift. We put G56 in my buddies 93 W350 and the NP205 bolted right up as well.



Here are some pictures: These pics and mods were done on a 2003 3500 4x4.

First the cross member with the new mount and the smaller old one from the NV5600

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The news and old trans



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The new trans and mount



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The old trans and mount. It is brute to handle.



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The new and old shifter stub shafts



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The shifters and buttons



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[Shadrach]

More details

The old and new trans to block adapters



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You'll notice that the old one has a 1/2" thicker flange where the starter mounts. With all the research I did I missed this part. The new transmission bolted to the old adapter and I had reused my old starter. When I went to start my newly rebuilt engine up for the first time Nothing After doing lots of head scratching and checking things out we discovered that the starter drive wasn't reaching in far enough to engage with the South bend Cluch and flywheel kit that I had installed. I ordered a new adapter from Cummins for an 08 6. 7 as that was what the trans was for and then had to pull the rear drive shaft, the t case and trans, the clutch and flywheel and put the correct adapter in. There was a week well wasted



I tried to see if I could use a different starter as that would have been a lot quicker, but no such thing exists. The 6. 7 starter wasn't any better, so I had to bite the bullet and pull every thing apart. I did end up using a 2nd gen starter as I not only had a new one but it uses the old style mounting for the wiring. The 03 starter uses a stupid plug for the small wire. Not only is it on the block side of the starter where you can't see it but the release clip fills up with dirt and then you can't unplug it or even get at it to clean it out easlily.



The old ( 03) starter with the plug and the new( 2nd gen ) with the small stud.



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Yes it means the small stud is on the lower side, away from the block but it's a lot easier to change. Of course I had to modify the wiring. What else is new.



See the little plug in the bottom left of the picture? That's the part I cut off the new wiring harness that I bought from Dodge to use for the back up light switch. The rest? File it in the spare parts bin as none of it is needed for this job.



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I still have to shorten my front drive shaft but it needs rebuilding anyway and I can live with out it for the summer, even in Canada :-laf. When I went to lengthen the rear one I ended up having to replace all 3 u-joints and the center bearing as well as re-tubing both pieces because there was a dent in the rear half. More $. Shadrach