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Old 11-14-2010, 05:23 PM   #1 (permalink)
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Transmissions compatible with the 6.9 mechanical diesel engine

I found a 6.9 mechanical diesel in a mid 80's f250, I asked about purchasing or trading for the motor, the owner said it needs a tranny, the only tranny I could find to use with it is the nv4500. What other transmissions could I use with this in my 79 f250 4x4. Is the the bbf c6 transmission compatible?
Thanks guys Loren
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Old 11-14-2010, 11:20 PM   #2 (permalink)
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The NV4500 is not a factory app for the IDI's. It is not BBF pattern.
What will work is any Ford truck 4 speed, as the T19 bellhousing will bolt to a 18 or 435. The diesel C6, The E4OD, and the ZF 5 speed. Any Ford diesel transmission up until 97 will bolt to the engine.
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Old 11-15-2010, 05:04 PM   #3 (permalink)
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I believe all 6.9 and 7.3 bellhousings up to 03 are the same, with the exception being that a dowel pin or something doesn't line up on the newer ones, but from what I have heard it has been done. As far as the bolt holes go I'm not aware that they changed anything.
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Old 11-15-2010, 05:25 PM   #4 (permalink)
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Only the top two bolts of the BBF belhousing match the IDI belhousing.
It can be made to fit by modding the 4 bottom holes and dowel pins.
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Old 11-15-2010, 06:19 PM   #5 (permalink)
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h

Hey everybody, thanks for the replies, everything I found pointed towards nv4500, thanks for correcting that part, I'd like to swap that 6.9 into my 79 f250 4x4, so if this trade goes through ill be searching for a diesel c6
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Old 04-23-2012, 02:24 PM   #6 (permalink)
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Only the top two bolts of the BBF belhousing match the IDI belhousing.
It can be made to fit by modding the 4 bottom holes and dowel pins.
I can't seem to find an answer on this, do the top 2 bolts have the right location to put the input shaft of the trans into the pilot bearing straight? I'm having trouble measuring this on the parts I have.
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Old 04-23-2012, 02:33 PM   #7 (permalink)
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I can't seem to find an answer on this, do the top 2 bolts have the right location to put the input shaft of the trans into the pilot bearing straight? I'm having trouble measuring this on the parts I have.
yes. my buddy just swapped a 460 zf into this 6.9 truck to replace the fubared 4 speed it came with, so i am not just blowing e-smoke up your ass. top two holes line everything up and the dowels and other holes have to be machined in to match up with all the other holes.

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Old 04-23-2012, 02:48 PM   #8 (permalink)
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never thought id see this thread again
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Old 04-23-2012, 06:02 PM   #9 (permalink)
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Cool beans. Got a BBF bell for an NP435 and a 7.3 IDI going into a '90 ranger. The other 4 holes looked as though they could either be lined up easily, or the adapter plate/block bolts countersunk into the plate, then the bellhousing bolts relocated and new holes tapped in the adapter plate.

Just needed the bit o' info about the top 2 holes. Thanks.

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Old 04-23-2012, 11:04 PM   #10 (permalink)
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Do you have an actual 460 bell, or a M/400 one? if it's a M/400 part, you will probably have the same problem with the flywheel/pressure plate hitting the bellhousing hitting the inside of the bell. If you have an actual 83+ 460 juice clutch bell, it is the exact same casting as the idi part, just drilled differently
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Old 04-24-2012, 12:28 PM   #11 (permalink)
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Hm, it does look kinda shallow near the top. Are the bolts in the same location either way? If it'll line up then I can just cut out the interfering part and make a sheetmetal cover.

The trans it came on was from '71, the bottom 4 bolts don't line up to bosses, and was sitting on a trailer by the time I got it, so is there an easy way to ID it?
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Old 04-24-2012, 12:45 PM   #12 (permalink)
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Hm, it does look kinda shallow near the top. Are the bolts in the same location either way? If it'll line up then I can just cut out the interfering part and make a sheetmetal cover.

The trans it came on was from '71, the bottom 4 bolts don't line up to bosses, and was sitting on a trailer by the time I got it, so is there an easy way to ID it?
whoa whoa whoa, hold up. are you even sure what engine this bellhousing came off of? the only thing with a 385 series bbf bellhousing pattern back in 71 would've been 429 mustangs. 400's came out in 71, but they weren't in anything besides big cars with autos. they didn't even get thrown in trucks and get manuals till 77. and 460 trucks didn't get manual trannies till 1980 or later iirc.
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