Anyone snapped a 727 extension housing

[A360]

Howdy fellas
First of all hope anyone in the NE got through the storm okay.


anyway I race a 63 Dodge 440 sedan (Phoenix in Oz) albeit slowly (12.1) which I have fun with street/strip.

Last Sunday racing first shakedown run when about shift from 2nd - 3rd not hammering just making sure all was right before qualifying got a servere vibration and backed off when heard a ''thunk'' and a massive smoke screen behind me at the top end had a gander underneath with tranny fluid all over the underside. Drove back to the pits okay although still leaving a smoke trail ,fluid on exhaust. When got it back and got it up on some trailer ramps found that the 727 extension housing was in two pieces showing about 1.5'' of the output shaft.

Couple of questions ,I had been chasing a intermintent vibration over the last few months ,maybe I have found it ,could a tail shaft out of wack cause this? or dodgy trans mount or anything else.

Can the extension housing be replaced in car?

Has anyone else had this issue?

Thanks in advance

Benton

 

[kidmopar]

is ur drive shaft too long and hitting the end of the housing when u take off or is ur pinion angle too excessive or even a bad u joint could cause this,, and yes u can change the housing while its in the car u need to spread the snap ring under the cover behind the trans mount and pull it off while u keep the snap ring spread out

 

[splicer]

Had same tailstock failure in my 64 Polara mid summer...found the driveshaft to grossly out of balance(even tho it's a custom alloy Strange engineering shaft that was supposed to have been balanced)....make sure you check mainshaft for straightness...they usually get bent when tailstock breaks off...

Splicer

 

[Someotherguy]

If you broke the tail shaft housing, then 99 times out of a 100, you bent the output shaft...

 

[terzmo]

if you are referring to the tail shaft...yes and yes to both questions...seen them break...and replaced...better than shattering the bellhousing...most likely cause was U joints in our case

 

[67 B-body]

if you are referring to the tail shaft...yes and yes to both questions...seen them break...and replaced...better than shattering the bellhousing...most likely cause was U joints in our case

then you can do this and use a J-W bell-housing like me.....

 

[moparstuart]

pinion angle

 

[A360]

Thanks all for the responses will be removing the tail shaft this week and take some photos and post for interest sake.

Benton

 

[A360]

Took the tail shaft out and removed the broken extension housing.

Checked the rear uni and found that it was stuffed no bearings inside one of the cups so I guess this is the root cause of the failure. Shame it took this to find the vibration.

Output shaft is umarked and straight.

 

[HEMI-ITIS]

Tou also need to go through your trans and check the sprag.Be a good idea to bolt it in also.