400/zf5
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Joined: Oct 2003
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From: Quesnel, BC, Canada
400/zf5
what flywheel should a guy be looking for? My buddy has a 88 F250 with a 6.9L/zf5 combo...the owner wants a gas engine and I found them a free 400. These guys are major machinists and have an extremely equipped shop at thier disposal.
*OT for a second*
I recently looked at purchasing a diesel F250. It was an 85 with a 4 speed, that origionally had a 460. The owner said he used the 460 bellhousing with the 6.9L and it was a straight bolt on. So please lets not debate the issue of whether or not the bell housing pattern is the same as I tend to believe what I see and not all the heresay. Thank you.
back on topic...I have tried searching and havent come up with and conclusive info. What I would like to know is if the crank pattern for the flywheel on the 400 matches up any other engines. I did find that we will need to space the flywheel out 1/2" from the crank so there is a possibilty we could fab this up to accept the 400s crank pattern.
One other thing I would like to know is if the 400 is internally balanced or if not what the imbalance is to help in our search for a flywheel.
-Al
*OT for a second*
I recently looked at purchasing a diesel F250. It was an 85 with a 4 speed, that origionally had a 460. The owner said he used the 460 bellhousing with the 6.9L and it was a straight bolt on. So please lets not debate the issue of whether or not the bell housing pattern is the same as I tend to believe what I see and not all the heresay. Thank you.
back on topic...I have tried searching and havent come up with and conclusive info. What I would like to know is if the crank pattern for the flywheel on the 400 matches up any other engines. I did find that we will need to space the flywheel out 1/2" from the crank so there is a possibilty we could fab this up to accept the 400s crank pattern.
One other thing I would like to know is if the 400 is internally balanced or if not what the imbalance is to help in our search for a flywheel.
-Al
I'll have the Roast Duck
Joined: Jul 2002
Posts: 9,622
Likes: 110
From: Northshore, MN
On a lathe, one could machine the OD to 400 specs, sweat the flywheel ring gear on, and that would only leave the center to deal with. Interpolating from the center hole, the crank bolt holes could be machined in, and the depth for spacing to the zf starter location could be put in, too, by using the diesel's flywheel depth. Sound simple?
Or you could use the 400 flywheel and bolt it up and hope for the best. I have the swap info around here somewhere, but I can't seem to find it.
Or you could use the 400 flywheel and bolt it up and hope for the best. I have the swap info around here somewhere, but I can't seem to find it.
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Posting Guru
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From: Quesnel, BC, Canada
i went on summit trying to find tooth counth for the diesel flywheel and had no luck...but did find out the imbalance is 28oz. The diesels are internally balanced. So thats a problem there. The donor truck is an auto to make it worse but Im sure we could find a 351m/400 flywheel for a 4 speed and go from there.
SO now it sounds like the hardest part is going to be finding a flywheel that will work.
A possibility would be to find a 460 zf5 flywheel, machine the 1/2" hub spacer and redrill to the 400 crank pattern, have the unit balanced and use the 460 clutch and pressure plate.
SO now it sounds like the hardest part is going to be finding a flywheel that will work.
A possibility would be to find a 460 zf5 flywheel, machine the 1/2" hub spacer and redrill to the 400 crank pattern, have the unit balanced and use the 460 clutch and pressure plate.
I'll have the Roast Duck
Joined: Jul 2002
Posts: 9,622
Likes: 110
From: Northshore, MN
Thread Starter
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Posting Guru
Joined: Oct 2003
Posts: 1,955
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From: Quesnel, BC, Canada
thanks for the help, buddy decided 460 as the owner wants a 460 and nothing else lol. But this is good info for down the road if I ever get my hands on an M block engine.
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