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Old 12-16-2010, 12:41 AM
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6.0 to 7.3 Conversion

I have a 2003 F-250 with an auto trans and a sick 6.0. I also have a 2000 7.3 with an auto trans that is wrecked with 114,000 miles on it. I want to put the 7.3 out of the 2000 into the 2003 with the 6.0. Has any body ever done this? Can you give me some direction?
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Old 12-20-2010, 09:17 PM
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Re: 6.0 to 7.3 Conversion

oh i'm sure its been done......just use all the wiring from 7.3 truck.
2008 F350 Lariat 6speed!
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Old 12-30-2010, 05:23 AM
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Re: 6.0 to 7.3 Conversion

You'd be better off swapping in a cummins..... The 7.3L uses an entirely different harness and you'll have a lot of fun trying to graft the two together. Just my $.02

2002 VW Jetta TDI
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Old 12-30-2010, 05:58 AM
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Re: 6.0 to 7.3 Conversion

It would be a pain... Unless you have all the wiring harness's from the 7.3, be plug and play then, swap it all over, piece of cake and go.
Renegade Diesel
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Old 02-18-2011, 05:06 AM
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Re: 6.0 to 7.3 Conversion

I've got a guy wanting me to do a similar conversion. He has his '99 7.3L 6 speed that he totaled(That I just built an engine for with headstuds, swamps injectors, new clutch, etc) and wants to use the engine and transmission in an '03 6.0 auto truck he just bought.

Anyone have experience with this? Hope going to the 'dumb' transmission will make things go a little smoother but I know that the center 'hump' in the cab is different from an auto to a 6 speed.


1997 F350: Regular cab XLT, 7.3L PSD, 5 speed, 4x4, 3.55 - Some Stuff
2000 F350: Crew Cab, Lariat, 7.3L PSD, 6 speed, 4x4, 3.73 - More Stuff
2001 VW Golf: 4 door, GLS, 1.9L TDi, 5 speed - Darn near makes fuel!

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Old 02-19-2011, 12:47 PM
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Re: 6.0 to 7.3 Conversion

As long as you have the complete donor it will be plug and play. On my Bronco I had to swap out the dash and engine harness along with both fuse box's, but the existing chassis harness and most of the interior plugs worked. Going from one diesel to the next you will probably have a lot less to swap than I did. Dash harness will likely be the same, you may just need to swap the engine harness, which is pretty simple.

As for the dumb transmission, I remember seeing one conversion where the guy cut the transmission hump out of the donor and grafted it into his truck.
1995 7.3 Bronco
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Old 02-21-2011, 07:42 PM
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Re: 6.0 to 7.3 Conversion

The 03 is a split year for the 6.0 and 7.3, so everything will be fairly simple. Ford to Ford is still easier than Dodge to Ford, although we specialize in Fummins!
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Old 05-27-2011, 06:08 PM
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Re: 6.0 to 7.3 Conversion

Looking to do the same thing with mine. Have a fully built 7.3 in a rolled truck, engine wasn't hurt and neither was I thank god. Looking at buying a like-bodied 03 or 04 king ranch or harley edition and swapping out the 6.0 and 5r100 for a 7.3 and bts 4r100. Kept the truck so I still have all the wiring harness, cluster, etc. Even if I end up buying another 7.3 the engine is going to come out for the built one so the labor part of it shouldn't be much more intensive....I hope. Exactly what all would have to be swapped over??
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Old 05-27-2011, 06:56 PM
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Re: 6.0 to 7.3 Conversion

We're doing a 99 V10 gasser to 00 7.3L swap, we'll find out how everything works soon.

97 F350 CCLB "Da Bus"

RIP Will Iott
"This ain't no practice run"

Originally Posted by countryboyrob View Post
And remember, he's cat rebel....he doesn't do it the normal way.
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Old 05-28-2011, 03:33 AM
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Re: 6.0 to 7.3 Conversion

In '02 they changed the instrument cluster, and the power distribution was all moved to one fuse panel under the dash. The 2000 harnesses/power distribution will be completely different from the '03. The 02 and later cluster needs an 02 and later 7.3 PCM/related wiring for the WTS/WIF lights to operate correctly. You'll be able to swap in the 7.3 but probably need a 02-03 7.3 engine harness and PCM to avoid having to rewire the entire truck.
96 F250 SC/SWB/4X4 XLT Just a 7.3 with a bunch of the usual bolt-on crap
08 F350 CC/LWB/4X4 DRW Lariat
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