I am fixing couple of oil leaks.

At first. My 904 is dropping oil from the output shaft seal area. I bought a new seal but the inner diameter is way too big to yoke which I have. I dont know which year tranny or drive shaft are used as this car has a mix of them. What I have found is that Rockauto has same "A727" seal for all from 1966 to 1975.

The second. I have also leaking drive shaft. This rearend is originally 1966 but have afterwards got 10" drums. Rockauto is listing only one type for 1966. Is that the "small" one. I have not opened the wheel seal area yet so I dont have dimensions for that. Did all 1966 7.25" use same seal?

Local shops does not keep these in stock so I have order parts somewhere.

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1966 Dart. 170 cu.in. 200 rwhp.

It might be helpful to post pics of what rear end and the back of the trans as there are variations in them.


Do you have a slip yoke style 904 or a flanged 904 on the transmission output.


Pics will help us get you the correct parts.


Greg

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http://www.youtube.com/hyperpack

I have replaced the drive shaft seal now. Old one was National 484058 and what I got from shop was National 5124. It was not exactly the same and was quite hard to install (with sledgehammer). Problem solved (until oil comes out again).

I have slip yoke. It is 39,60mm in diameter. The seal for 66-72 cars is correct for the yoke. I dont know if the seal for 73- up cars is correct for the transmission tail. The removed seal is apprx 60mm in the mounting ring diameter.

Seems that I have kind a hybrid of parts. This come with the car 22 years ago to me. When I rebuild the transmission I didnt replace the seal (as I have not had one).

So I need a "conversion seal" which fits to 73- up transmission housing and is good for 66-72 yoke. The part removed from transmission does not have part numbers on it.

39.6 mm yoke = 1.56"
60mm installation hole in the transmission = 2.36"

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1966 Dart. 170 cu.in. 200 rwhp.