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That sucks man, it always feels like it never ends, but that is just absurdly unlucky.

I have no idea what the initial problem was, but I'm thinking an initial flywheel/crankshaft issue caused this.

Good luck

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This is my dad's first car and it has sat multiple times due to it being to frustrating and dad steps away from it for a while. We redid my car when I was in high school instead of working on his. Him and I have barely even got to cruise around together because of the problems we run into with his car.
Worst part is that I know the car is just going to sit for quite a while cause my dad is just done with it. Putting all the time and money into rebuilding everything and now that's what happens. rant/venting over

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Wooooow, that is freaking impressive. Plenty-o-$$$-carnage. Sorry it's going to take a lot out of your dad's passion for the car.

I can think of a few ways to tear up something like that.
Bad mounts.
Incorrect drive shaft angle, maybe length.
Cracked bell that escaped detection.
Missing/loose bolts.

Lot's of ways to get there.

Were you banging on it? Hit any big bumps?

All fun and games until you break something and the wallet needs to come back out.

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So we rebuilt the motor last year and had a new clutch, pressure plate, flywheel, throwout (sp?) bearing put in. But we still had a slight vibration, so that was the only thing that hadn't been replaced. Took his old one out and had it rebuilt. Transmission guy said all seemed okay as far as possible vibrations coming from that, but went ahead and replaced a few things in there that had wear. Tighten everything back up and the car didn't want to go in any gear. Got the clutch rod adjusted correctly and this was the second time taking it out on the road. First time was a local cruise, 5 mph up and down a street blocked off for the cruise and a ten minute ride on the highway there and back. Then today took it out and got on it twice. Heading home going 45 mph and then that. I thought pinion angle as others talk about on here, but the car has been set up this way since the 80's. correctly aligned the bellhousing studs, so that takes out that possibility.
Also while chasing the vibration problem my dads bellhousing had previously broke and it was welded back together. Told transmission guy about that and he sent us a new one $$$. Also motor mounts are new and not the cheap ones and the transmission mount was new (now toasted). I believe rebuild on this was over 1k and less than 50 miles (at most) later it eats itself. Went back and found a big chunk of the bellhousing, clutch rod, boot, and the fork on the road.
I'm surprised at how my dad kept his cool through it all. Best case scenario is it needs a new bellhousing, transmission, and the radiator fixed. Usually when I'm I'll go take a cruise in my bee or challenger, well definitely not doing that tonight!!
Trying to do a few things to my car before Nationals, but this has killed it for me too. I'd rather just work on getting his car going again that weekend.

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After sleeping on this, I bet that bellhousing needed to be indexed even though it was stock, and was just a bit too far off

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After sleeping on this, I bet that bellhousing needed to be indexed even though it was stock, and was just a bit too far off

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This , new bellhousing , it is not indexed to the engine . Original bellhousing are attached to the engine block when it is being machined and mated to it .

the vibration could have been anything , it should have been found .

I'll ask a dumb question , was there a cover on the bottom of that bellhousing ? Also what was the source of that bellhousing , used replacement part or brand new ?

as far as the pinion angle , you say it's been like that since the 80's , but that doesn't mean it's correct , what were the rear springs ? Was the rear and original car rear or a modified truck rear ?

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Indexed, does that equal the dowel pin deal? If so, that was done. I believe it had one of the plastic inspection covers on it. It is the correct Dana for the car with SS leaf springs still on it.
Well considering we got an entirely different block, different balancer, literally everything was different and it was still present. Nobody could figure out what it was from.
New motor, unhook all the power accessories and it was still there.
New motor mounts, new front end, new transmission mount, driveshaft balanced, new u joints all the way around, different exhaust (in case it was hitting) etc etc.
Cut the input shaft in case that was the problem and that did nothing. Then when we got the transmission rebuild that was all new input shaft and what not. I would have to find a receipt to see if the bellhousing was used or brand new. The "new" bellhousing was used before we got the transmission rebuilt with no problem. One of us would torque down bolts and other would always check, we were that paranoid (cautious?).
Look at previous threads I had on this problem and no solutions worked out.
Thats about all I can think that we have done with the car. O and lots of cursing at it over the past 3-5 years . Something I was surprised I did not even hear last night when this happened lol.

We've thought of just about everything, even possibility that the floor pans weren't welded in good enough and that's how were feeling it

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After sleeping on this, I bet that bellhousing needed to be indexed even though it was stock, and was just a bit too far off

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This , new bellhousing , it is not indexed to the engine . Original bellhousing are attached to the engine block when it is being machined and mated to it .

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After sleeping on this, I bet that bellhousing needed to be indexed even though it was stock, and was just a bit too far off

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This , new bellhousing , it is not indexed to the engine . Original bellhousing are attached to the engine block when it is being machined and mated to it .

the vibration could have been anything , it should have been found .

I'll ask a dumb question , was there a cover on the bottom of that bellhousing ? Also what was the source of that bellhousing , used replacement part or brand new ?

as far as the pinion angle , you say it's been like that since the 80's , but that doesn't mean it's correct , what were the rear springs ? Was the rear and original car rear or a modified truck rear ?

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Indexed, does that equal the dowel pin deal? If so, that was done. I believe it had one of the plastic inspection covers on it. It is the correct Dana for the car with SS leaf springs still on it.
Well considering we got an entirely different block, different balancer, literally everything was different and it was still present. Nobody could figure out what it was from.
New motor, unhook all the power accessories and it was still there.
New motor mounts, new front end, new transmission mount, driveshaft balanced, new u joints all the way around, different exhaust (in case it was hitting) etc etc.
Cut the input shaft in case that was the problem and that did nothing. Then when we got the transmission rebuild that was all new input shaft and what not. I would have to find a receipt to see if the bellhousing was used or brand new. The "new" bellhousing was used before we got the transmission rebuilt with no problem. One of us would torque down bolts and other would always check, we were that paranoid (cautious?).
Look at previous threads I had on this problem and no solutions worked out.
Thats about all I can think that we have done with the car. O and lots of cursing at it over the past 3-5 years . Something I was surprised I did not even hear last night when this happened lol.

We've thought of just about everything, even possibility that the floor pans weren't welded in good enough and that's how were feeling it

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hi ,

with that kind of damage there shoud have been oi /trany fluid every where ?

did not see it in the pic , you did have fluid in it ????

also is that a internal balanced engine or a cast crank external needing a matching flywheel ?

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This happened ~a mile up the road. Someone gave me a ride to our house and I grabbed the truck to pull it home. Realized the driveshaft was not going to cooperate so went back home and got tools. Basically the pictures are from 2.5 hours after this happened and in our shed. It was full of fluid, you can follow our trail home bc of all the fluid. That and a bunch of antifreeze. I don't remember the motor specs, but this all was looked at before the rebuild since the vibration was the reason for a rebuild. Once again rebuild = New block, heads were reworked for the old motor bc someone said that could be the vibration, new crank, cam, everything.
I work overnights so I'm heading to bed now. Don't really know what my dad is gonna do with the car now. I wanted to start taking it out last night, but kept as is to document better and see what dad thinks.
Thanks for all the replies though and constructive criticism. I will show dad this to verify what I'm saying is correct or answer questions I can't.

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After sleeping on this, I bet that bellhousing needed to be indexed even though it was stock, and was just a bit too far off

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This , new bellhousing , it is not indexed to the engine . Original bellhousing are attached to the engine block when it is being machined and mated to it .

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I can see that you have never been in an engine machining / assembly plant.

The only thing attached to an engine block for machining is the bearing caps or main bearing bedplate (if equipped).

A bellhousing is machined separately, most likely in a separate plant, or at a minimum in a separate area of the plant, and taken off a palate or feeder and randomly selected to be bolted to the back of an engine. This is a relatively non-critical joint as far as geometry goes.

Looks like an assembly error to me. Probably left the bolts loose.

Accidents happen, especially on long term off again / on again projects.

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After sleeping on this, I bet that bellhousing needed to be indexed even though it was stock, and was just a bit too far off

---

This , new bellhousing , it is not indexed to the engine . Original bellhousing are attached to the engine block when it is being machined and mated to it .

the vibration could have been anything , it should have been found .

I'll ask a dumb question , was there a cover on the bottom of that bellhousing ? Also what was the source of that bellhousing , used replacement part or brand new ?

as far as the pinion angle , you say it's been like that since the 80's , but that doesn't mean it's correct , what were the rear springs ? Was the rear and original car rear or a modified truck rear ?

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Indexed, does that equal the dowel pin deal? If so, that was done. I believe it had one of the plastic inspection covers on it. It is the correct Dana for the car with SS leaf springs still on it.
Well considering we got an entirely different block, different balancer, literally everything was different and it was still present. Nobody could figure out what it was from.
New motor, unhook all the power accessories and it was still there.
New motor mounts, new front end, new transmission mount, driveshaft balanced, new u joints all the way around, different exhaust (in case it was hitting) etc etc.
Cut the input shaft in case that was the problem and that did nothing. Then when we got the transmission rebuild that was all new input shaft and what not. I would have to find a receipt to see if the bellhousing was used or brand new. The "new" bellhousing was used before we got the transmission rebuilt with no problem. One of us would torque down bolts and other would always check, we were that paranoid (cautious?).
Look at previous threads I had on this problem and no solutions worked out.
Thats about all I can think that we have done with the car. O and lots of cursing at it over the past 3-5 years . Something I was surprised I did not even hear last night when this happened lol.

We've thought of just about everything, even possibility that the floor pans weren't welded in good enough and that's how were feeling it

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Cast crank or forged , internal or external balance ? Was the flywheel checked for neutral if it's a neutral as i see it is an OLD original flywheel. SS springs , was the pinion angle corrected when they were originally installed as they do change the pinion angle.

Yes indexing is the offset dowel deal. Do you have a picture of that bellhousing when it was in one piece ?

Link to old thread on this issue ?

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Cast crank or forged , internal or external balance ? Was the flywheel checked for neutral if it's a neutral as i see it is an OLD original flywheel. SS springs , was the pinion angle corrected when they were originally installed as they do change the pinion angle.

Yes indexing is the offset dowel deal. Do you have a picture of that bellhousing when it was in one piece ?

Link to old thread on this issue ?

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Lot's of answers found in the old thread. You actually helped out also.
Here is the one I could find. Seems this issue has been going on longer than I remembered.

https://board.moparts.org/ubbthreads/showflat.php?Number=5264280