engine swap 6.9 -7.3

[promustangman]

Ok guys I need some help again

My 84 extra cab 6.9 with c6 auto is now popping freeze plugs we believe its a bad head gasket rebuilt the oil cooler and put several hundred miles on it before this happened now I know the previous owner ran it hot .


Any ways I found a 7.3 out of an 87 f250 that had a manual trans with about 90k miles on it

My question is will I have any problems doing this swap . Can I just take the flexplate and all off the 6.9 and put it on the 7.3 or is that how they balance the engine..


Is there any other problems I might run into ??

Thanks Guys

 

[mark7.3idi]

No it will work you just have to change the flywheel and a 1987 is still the 6.9 the 88 was the first year for the 7.3. What is the manual trans i may be interested in it.

 

[promustangman]

6.9-7.3 Swap

He already sold the trans. I can get the motor Cheap . Less that what it will cost me in Gaskets .

I would rather swap it then rebuild it at this time . I need to get the truck back on the road.

He says its a 7.3 I didnt ask if he had swapped it out in his,

Thanks

 

[sootman73]

the 7.3 and 6.9 are the same motor on the outside. the inside has different boring of course and the 7.3l has bigger head bolts but thats really about it. should go right in for ya.

 

[promustangman]

I am mainly worried about the ring gear since the 6.9 is auto and the "7.3" is a manual
Reading through the tech section I see there are different ones for these engines. I am hoping its actually a 6.9 and that everything will just bolt together .

Otherwise I will have to find a ring gear -flexplate to fit a 7.3 and i believe they all came with e40d trans+manuals and flexplate might not fit inside my c6 trans.

Thats what I am worried about right now. I had similar problems with my mustang swaps I have done in the past.

Thanks Guys!!

 

[sootman73]

i would just take them both off and compare the diameter of the flywheel to the flexplate. it should be the same size IIRC.

 

[promustangman]

Yep Thats what it looks like I will have to do . Yuck gotta climb under the truck again...

 

[towcat]

6.9/7.3 swap is a direct drop in. swap over your flywheel and you're good to go.

 

[typ4]

As towcat said it is a direct bolt in. Quit thinking about it and do it.

 

[hesutton]

Let me repeat the above. It will just bolt in. You can use the flexplate from your truck on the "new" motor without issue. I've done the same with my '86. I have a 7.3 with a 6.9 flywheel, clutch, and other accessories.

Heath

 

[promustangman]

Well I was a little slow getting back to the guy and he sold it .. Bummer

anyways looks like I gotta pull that oil cooler off and replace that freeze plug behind it clean everything out and see what happens..