SD 7.3 into OBS w/ ZF5

[jsm1573]

So I have a Frankenstein OBS truck that I am looking to put an SD 7.3 into. It is a 1997 Ford F350 4x4 CCLB w/ the 7.3 and a ZF5. Originally the truck was a 2wd automatic dually and I installed the suspension from my old 94 f250 along with the bed and ZF5 to make it a 4x4 5 speed truck. Now I have a 7.3 out of a 2000 f350 and I want to install it into my OBS. I need to know everything extra needed for this swap. Such as do I need a PCM/IDM from a SD manual truck or can I use the PCM/IDM that I have. And will a clutch designed for a SD 7.3 work with a ZF5 from a 94 OBS? Any other info would be great too. Thanks in advance!

 

[79jasper]

You can swap the injectors from the old engine, then run the old pcm/idm.
I can't recall exactly, but I believe the SD manual trans had a longer input shaft.

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[jsm1573]

Well the SD 7.3 already has a decked out fuel system from regulated return, to the frame mounted pump and filters, an adrenaline hpop, and a larger turbo plus more. It also has about 200k less miles than the engine in my truck now. So I was more looking to swap the whole engine. And are you saying the zf5 I have now might not have a long enough input shaft to work with the SD 7.3?

 

[Garbage_Mechan]

Here is what I know to be fact.
7.3 long block assemblies interchange between OBS and SD with one exception, there is no fuel pump lobe on the SD 7.3 cam so SD in OBS requires electric fuel. Should be done to every performance 7.3 so no issue.

 

[Garbage_Mechan]

For most other items just bolt the OBS item on the new engine. Valve cover gaskets have different plugs on the outside so they have to change.

 

[Garbage_Mechan]

Regarding injectors, run whatever you like and have the programming to run them on your chip.
Or if you are a detailed, methodical elecricly orientated person you could swap in the PCM connector, switch to a SD Map sensor and run SD PCM. There is a stickie out there on PSA or PSN for it.

 

[Garbage_Mechan]

Trans wise just run all OBS parts adaptor plate out.

 

[Garbage_Mechan]

Turbo system wise the SD system can be made to fit OBS. For a stock SD turbo not worth it..for a older tech SD perf turbo with “66” somewhere in the name..... forget it get one of the drop it SXE based turbos or run stock OBS until you can afford a drop in or T4 system.

 

[jsm1573]

So your saying keep the OBS pcm and get it programmed for the sd 7.3?

 

[Garbage_Mechan]

If your SD engine comes with a real worthy complete (not modded stock) turbo would be the only reason to go through the hassle of running SD turbo system.

 

[jsm1573]

Also I believe the engine already has all the upgrades needed regarding the turbo and oil system and fuel system I’m just trying to make sure I cover all my basis when it comes to making it communicate with the obs. And of course making sure the zf5 will work

 

[Garbage_Mechan]

So your saying keep the OBS pcm and get it programmed for the sd 7.3?

Are you planning on running a multi position switchable chip such as a Hydra? If so the chip will hold all the programs needed for the injectors you run. Even on “stock” setting.

 

[jsm1573]

When I get home I will have to double check all the receipts that came with it to verify what parts are on it

 

[jsm1573]

Yes it has a hydra chip and I was looking to get my injectors from swamp diesel. They offer to put 6 programs on the chip for free. Do I need to tell them my exact situation so that they program it for the obs pcm?

 

[Garbage_Mechan]

As far as ZF5....bolt on the OBS parts and go.......just like stock.