727 Extension housing bushing removal and replacing?

[trebor75]

I have a 1970 Plymouth Duster with a 727 and 8 3/4 rear end. The driveshaft is the correct length and the u joints are in good shape.
Been feeling a vibration at certain speeds when driving. I jacked the car up and there is some play between the slip yoke and output shaft.
There is a bushing inside the extension housing right? If this is worn there is more play and could cause my vibration I suspect.
Is it possible to remove and replace that bushing with the transmission in the car? I would need to remove the extension housing I suspect? Or is there a tool to do it without removing the housing?

Can anyone give some advice to how it's done, or point me in a direction to a video or article on the subject? Never done that before.
I tried searching here and also looked through the articles but came up short.

All the best // Robert

 

[413]

Yes there is a tool to do it with trans together. I had it done at a trans shop once.

 

[trebor75]

Yes there is a tool to do it with trans together. I had it done at a trans shop once.

Thanks. I wonder what that tool could be called and if I can find it.
If I cant, is it still possible to remove the extension housing with the trans in the car and remove the bushing that way?

 

[Dana67Dart]

There is a post about this and there is a photo of A tool not the correct tool but it will give you name and look of the tool.

This is NOT the right tool for your trans

 

[trebor75]

There is a post about this and there is a photo of A tool not the correct tool but it will give you name and look of the tool

Thanks. I'm Swedish so there is also that, I'm not that well versed with the terminoligy

 

[tjpatte]

This is the one that I have and it works really well, did it in the car.

IN-CAR TAILSHAFT BUSHING R&R TOOL 30 SPLINE A833 4-SP & 727 TF - Mopar A833 4-Speed Transmission & Component Specialists

IN-CAR TAILSHAFT BUSHING R&R TOOL 30 SPLINE A833 4-SP & 727 TF

www.brewersperformance.com

 

[trebor75]

This is the one that I have and it works really well, did it in the car.

http://[URL]https://www.brewersperf...ushing-removal-install-tool-a833-4-speed-727/

[/URL]

Thanks!

 

[Dana67Dart]

just a note about the play... it might not be the cause of your problem. my trans 160,000 since last rebuild has considerable play in the slip yoke but no vibrations

 

[jbc426]

I bought the tool to do it in the car. It worked great, but I found the new bushing still left the output yolk with too much play. It was a brand new forged yolk too.

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.

 

[trebor75]

Thanks for the input guys. Much appreciated. I need to start somewhere so I'll start with replacing the bushing.
I have also thought about the balance of the driveshaft, It should be balanced because I had a shop do it. But that was many years ago.

 

[413]

Also the slip yoke can be worn, measure it and you may be surprised.

 

[Dana67Dart]

I have also thought about the balance of the driveshaft, It should be balanced because I had a shop do it

check the joke alignment IE are the U joints inline with each other anything not inline can cause vibration. My Dads 67 Dart maintenance note book there is a note that he had the drive shaft replaces do to noise / vibration at speed


This was in Feb of 69 and 24000 miles he bought it Feb of 67 and was his daily driver

 

[trebor75]

Also the slip yoke can be worn, measure it and you may be surprised.

I will do this. Do you know the measurements it should have?

 

[trebor75]

check the joke alignment IE are the U joints inline with each other anything not inline can cause vibration. My Dads 67 Dart maintenance note book there is a note that he had the drive shaft replaces do to noise / vibration at speed


This was in Feb of 69 and 24000 miles he bought it Feb of 67 and was his daily driver

View attachment 1716526676

Will check this. But I do have a fair bit of play, so I that might be the problem.

 

[Dana67Dart]

But I do have a fair bit of play

Mine has visual and audible play, no vibration. I'm not against replacing it.

 

[413]

I will do this. Do you know the measurements it should have?

No, but if you measure it from end to end you may see it smaller diameter or with low spots at some point. That's what mine showed, very uneven.

It would seem when it was machined new it was the same diameter and round the entire length.

 

[Dana67Dart]

727 used slip yoke polished by reputable drive line shop

1.680 (1.6795 to 1.6805 depending on where I measured)

Neither the FSM or Tom Hands TorqueFlite book discuses a tolerance or bore diameter or OD for the rear slip yoke. Tom's book just says if its too worn replace it! (Pages 117-119)

 

[trebor75]

727 used slip yoke polished by reputable drive line shop

1.680 (1.6795 to 1.6805 depending on where I measured)

Neither the FSM or Tom Hands TorqueFlite book discuses a tolerance or bore diameter or OD for the rear slip yoke. Tom's book just says if its too worn replace it! (Pages 117-119)

Thank you! Much appreciated!

 

[trebor75]

This is the one that I have and it works really well, did it in the car.

http://[URL]https://www.brewersperf...ushing-removal-install-tool-a833-4-speed-727/

[/URL]

Thanks for showing me that link. I got that tool, it cost me an arm and a leg to get it here to Sweden, but it worked like a charm. Bushing is out and replaced with a new one.

 

[Dana67Dart]

. Bushing is out and replaced with a new one

How is the before and after play

 

[trebor75]

How is the before and after play

I have not yet installed the driveshaft. But I did slip the new bushing over the yoke and compared it to the old one when I had removed it and it was a fair bit more play with the old bushing. I also measured my slip yoke at different places and it seemed to be very even, around 1.680. The old bushing looked quite worn too. But I'll get back when the driveshaft is installed so I can really tell if this helped.

 

[tjpatte]

Thanks for showing me that link. I got that tool, it cost me an arm and a leg to get it here to Sweden, but it worked like a charm. Bushing is out and replaced with a new one.

Glad it worked out for you! Sure beats pulling it all apart to just swap the bushing.

 

[MOPAROFFICIAL]

I don't know if it's been said already but I would just twist the speedo and pull the tail shaft.

 

[jbc426]

I have not yet installed the driveshaft. But I did slip the new bushing over the yoke and compared it to the old one when I had removed it and it was a fair bit more play with the old bushing. I also measured my slip yoke at different places and it seemed to be very even, around 1.680. The old bushing looked quite worn too. But I'll get back when the driveshaft is installed so I can really tell if this helped.

Just stating the obvious, bet be sure to lube both parts with transmission fluid.

 

[trebor75]

Just stating the obvious, bet be sure to lube both parts with transmission fluid.

Thanks. I will.