6.9 ?s
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Post Fiend
Joined: Sep 2006
Posts: 5,181
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From: Across from the neighbors
6.9 ?s
Ok im planning on installing a 6.9 in my 78 f-250. Me and Dave S. have discussed wiring but theres a few more things i need to know. The parts truck thats available has a 4 sp and i want an auto. Ive heard myths about the bellhaousing being the same as a 460. Is this true? Also how close would a 6.9 come to bolting upp to the 460 engine stands? Any help is much appreciated.
Dave
Dave
Post Fiend
Joined: Nov 2003
Posts: 21,285
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From: Nutter Fort, WV
No gasser tranny will bolt up to a diesel.
Not sure exactly what you need to do to mount it in a 78, but I think there is someone here that has done that.
Now if I could just remember who it was.
Not sure exactly what you need to do to mount it in a 78, but I think there is someone here that has done that.
Now if I could just remember who it was.
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Post Fiend
Joined: Sep 2006
Posts: 5,181
Likes: 3
From: Across from the neighbors
Well i figured that much. just my luck. So how much power can i expect out of it with a couple hundred thousand on it? If i run a 4spd, 456 gears and 33s whats this thing gonna do? Im lookin to pull the local 78 chevy with a 454 around adn still run pretty decent.
Elder User
Joined: Mar 2004
Posts: 747
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From: Klamath Falls OR
That would be me Dave LOL!
As for the IDI. You will need a Diesel C-6 tranny (easy swap over if you do it that way) You will need the gasser output shaft of a C-6 and use the governor from the Diesel.
Here is where I posted pics and what I did.
http://www.oilburners.net/forums/showthread.php?t=20527
As for the IDI. You will need a Diesel C-6 tranny (easy swap over if you do it that way) You will need the gasser output shaft of a C-6 and use the governor from the Diesel.
Here is where I posted pics and what I did.
http://www.oilburners.net/forums/showthread.php?t=20527
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Post Fiend
Joined: Sep 2006
Posts: 5,181
Likes: 3
From: Across from the neighbors
Looks like a nice job. I need a lil more help understanding how you made the engine mounts. I see you welded tabs to the truck frame then used pieces from teh 80s model truck? What parts did you use from the desiel truck?
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Post Fiend
Joined: Sep 2006
Posts: 5,181
Likes: 3
From: Across from the neighbors
i wonder how much a desiel c6 will cost me. Also if i use the stock 4spd ill have to mount a hydraulic clutch correct? also what 4spd came in these trucks?
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Elder User
Joined: Mar 2004
Posts: 747
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From: Klamath Falls OR
Originally Posted by crazyredneckanyhow
Looks like a nice job. I need a lil more help understanding how you made the engine mounts. I see you welded tabs to the truck frame then used pieces from teh 80s model truck? What parts did you use from the desiel truck?
The cool part is I used the nuts and bolts from the 80's truck. So if you ever need to replace the parts........ You can get them from an 80's truck!
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Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
This is getting bad, Dave, Dave and Dave plus bigblu78 who is probably also Dave.
4.56 gears with either a C 6 or T 19 behind a 6.9 will pull anything if you can get enough traction.
But 3000 RPM will be 64 MPH on 33" tires and it probably won't run 70 MPH before the governor shuts the fuel down.
4.56 gears with either a C 6 or T 19 behind a 6.9 will pull anything if you can get enough traction.
But 3000 RPM will be 64 MPH on 33" tires and it probably won't run 70 MPH before the governor shuts the fuel down.
Lead Driver
Joined: Nov 2003
Posts: 6,900
Likes: 3
From: Campbell River, B.C.
Originally Posted by Dave Sponaugle
This is getting bad, Dave, Dave and Dave plus bigblu78 who is probably also Dave.
I would caution against 4.56 gears with a diesel, your top speed will be very low, even 4.10s were an overkill for me.
Senior User
Joined: Dec 2004
Posts: 317
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From: Mackinaw, IL
Nope.. no Dave's here.. Just a Troy!! 
These guys are right though. I have C-6's with 4:11's in two of my trucks and they will pull anything but they are very disappointing at higher speeds. I run around 2600-2700 rpm at about 60mph.
These guys are right though. I have C-6's with 4:11's in two of my trucks and they will pull anything but they are very disappointing at higher speeds. I run around 2600-2700 rpm at about 60mph.