727 Extension housing bushing removal and replacing?

[M_Body_Coupe]

...I was going to have the yoke hard chromed to tighten it up, but ended up using a Teflon coated bushing from a GM or Ford or something that left it with the perfect clearance and no more high speed vibration...

Do you still have a part# for that bushing?

I ask b/c last season I was trying to chase this thing down. Had a pronounced vibration at high speed, replaced the trans and rear-end yokes (the shop felt the roller bearings in the yokes were showing wear, was actually told by them: "...umm, just how hard do you yank on the yoke cap retaining u-bolts???...", they thought maybe the caps were being distorted and that actually caused the wear. I swear I was within spec...but that was done years ago and I had not written down any assembly notes, so we replaced with new parts.

Anyways...so I put everything back together and of course it made no sense to re-assemble with the old tailshaft bushing. Since I had the tool already I tossed in a NEW bushing.

The Durabond RP6189T had an oil capture coating on the inside that made it for a tighter fit, like 0.001", but it did not have the oiling hole, so instead I used the Timken 7300S bushing.

In the end, I had a couple of thousands less play, but the high speed vibration didn't change much, if at all, so I'm inclined to think that in my case it must be something else and having gone through just about all the other components I am only left with the 727 transmission internals.

 

[trebor75]

How is the before and after play

I installed the driveshaft yesterday. With the new bushing there is significant less play. But, there is still a little bit of play. My thoughts are, I will put everything back together and take it for some test drives and see if this solved or improved the vibration.

 

[Swinger 340]

I installed the driveshaft yesterday. With the new bushing there is significant less play. But, there is still a little bit of play. My thoughts are, I will put everything back together and take it for some test drives and see if this solved or improved the vibration.

You don't want to improve the vibration you want it gone. Even a slight vibration will wear on the new bushing, then you will have the same issue later. I would check for dents or missing balance weights on the driveshaft, first and then ask around to barrow a drive shaft from someone and install it and see if you bare good to go. Check for U joint clips missing or not installed correctly. When doing my own as in removing the driveshaft for any reason, I always mark the pinion yoke to the driveshaft and the transmission yoke to the other end of the driveshaft. That way it should be balanced as from the factory, unless damaged in some way. Letting off the gas at around 60-70, when you feel a vibration, should increase the vibration a bit (free wheeling). If not, it may be something else, as in your tires or rims out of balance or damaged.