Boom

[polara71]

For what reason would the tail shaft of a 727 explode at a cruising speed?

 

[C Body Bob]

Sprag or overrun bearing failed.

 

[Big_John]

Just the tailshaft?

There's not much going on inside. The governor and the speedometer gear. I suppose the governor could come apart... But I've never seen that happen.

I've also heard of bad motor mounts and a stiff trans mount causing cracking.

 

[Big_John]

Sprag or overrun bearing failed.

That spins up the front (I think) drum and takes the whole case out. The tailshaft stays in one piece.

 

[polara71]

I was told if not the U joint then bearings or governor .
Horrible feeling at 65 mph, pictures to follow , Tomorrow .

 

[Big_John]

Yea, A u-joint or drive shaft problem could probably cause it too.

 

[C Body Bob]

Ive heard of tailshafts cracking from a bad trans mount. Never explode.

 

[300rag]

That doesn't sound good.

 

[polara71]

Transmission and engine mounts are / were good.

 

[polara71]

That doesn't sound good.

It wasnt, pieces of my transmission tail shaft are still on the NJ Turnpike

 

[The Captain]

Neutral drop at Carlisle

 

[1978 NYB]

Sorry to hear that Dave!

I would replace the U-joints and have the driveshaft spin balanced too.

 

[polara71]

Neutral drop at Carlisle

Years ago when I was younger than 22 I would do a neutral drop for any reason. After that I learned, no more. I was able to swap a 727 on my back in four hours with only a floor jack and hand tools

 

[polara71]

Sorry to hear that Dave!

I would replace the U-joints and have the driveshaft spin balanced too.

The driveshaft is all banged up after apparently hitting another car and the Jersey barrier

 

[LocuMob]

That sucks. I'm replacing my u joints this week, been needing to do so anyways.

 

[1978 NYB]

No warning? Just exploded? Usually a very bad violent vibration for a few seconds and a lot of noise.

 

[barnfind]

Hope it didn't hurt the pans..

 

[1978 NYB]

I quit doing neutral drops in my cars 40 years ago. LOL.

 

[polara71]

No warning? Just exploded? Usually a very bad violent vibration for a few seconds and a lot of noise.

Nope, I just commented to Diane how well the car is riding, nice and smooth....A few minutes go by


BOOM!


Then the VIOLENT vibration and I mean VIOLENT. Smoke out of the back of the car, that was the transmission fluid dumping out. Not sure how the floor pans are , I was amazed that the gas tank, rear and exterior metal and trim suffered NO damage

 

[polara71]

Ive broken U joints before, engine mounts, had rears lock up while going down the road. This was much worse .... My first thought was something let go on the front end, like a joint or TRE