Which transmission.

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lsrguy2007

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Hi everyone.

I have a 1973 Dodge Dart Sport with a 225 slant 6 and automatic transmission. How do I know if I have the 904 or 727 transmission? I want to change the transmission filter and gaskets. Any help is appreciated.

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The old filter kits came with both gaskets. The filter is the same. 904 has a square-ish pan with a corner loped off. A 727 has a bump on one side.
 
904 pan is almost square and the 727 has a kick out on the side.
You probably have a 904 in that car.
In any case, do yourself a favor and get the gasket for the 42RH.
It is rubber over metal and is reusable.

If for some reason you have a 727, the 46RH gasket is the one you want.

Sealing a pan gasket can be a bit tricky if you are not familiar with doing it, and the reusable gaskets work really well.

IMG_5103.jpeg
 
Unless you have a truck or maybe a taxi/fleet vehicle, it's a 904. 727s never came behind standard-duty slants.
 
TrailBeast said:
904 pan is almost square and the 727 has a kick out on the side.
You probably have a 904 in that car.
In any case, do yourself a favor and get the gasket for the 42RH.
It is rubber over metal and is reusable.

If for some reason you have a 727, the 46RH gasket is the one you want.

Sealing a pan gasket can be a bit tricky if you are not familiar with doing it, and the reusable gaskets work really well.

View attachment 1716185589
Click to expand...
Thanks for all of the information. I'll get the 42Rh gasket.
 
TrailBeast said:
904 pan is almost square and the 727 has a kick out on the side.
You probably have a 904 in that car.
In any case, do yourself a favor and get the gasket for the 42RH.
It is rubber over metal and is reusable.

If for some reason you have a 727, the 46RH gasket is the one you want.

Sealing a pan gasket can be a bit tricky if you are not familiar with doing it, and the reusable gaskets work really well.

View attachment 1716185589
Click to expand...
Thanks! I'm was planning on using either Dextron Vl or ATF4+4. I'm only replacing the amount that comes out of the pan when it's dropped. Would Dextron Vl be better? Thanks.
 
lsrguy2007 said:
Thanks! I'm was planning on using either Dextron Vl or ATF4+4. I'm only replacing the amount that comes out of the pan when it's dropped. Would Dextron Vl be better? Thanks.
Click to expand...

The new fluids are not necessary.
Personally I run type F and have in every 904 or 727 as well as my 42rh.
But you can run whatever makes you happy.
 
TrailBeast said:
The new fluids are not necessary.
Personally I run type F and have in every 904 or 727 as well as my 42rh.
But you can run whatever makes you happy.
Click to expand...
Thanks. I'm assuming it has Dextron in it as it's a one owner car and didn't want to mix fluids. The owners manual says 16 pints capacity. I'm guessing that's the amount it takes when refilling it after a filter change?
 
8 quarts seems about right for a full drain, converter and all. Most likely has plain old ATF. If iim not mistaken Dextron is an General Motors Trademark
 
I always ran Type F in my 904 with never an issue. When I went to a 42RH, I wasn't sure, and F seemed harder to find so I went with Dexron,( lV...I think).
 
lsrguy2007 said:
Thanks. I'm assuming it has Dextron in it as it's a one owner car and didn't want to mix fluids. The owners manual says 16 pints capacity. I'm guessing that's the amount it takes when refilling it after a filter change?
Click to expand...

Yea, I would say Dex is a good guess to not mix fluids.
These TF type transmissions will run just fine on used french fry oil. :D
 
Professor Fate said:
Unless you have a truck or maybe a taxi/fleet vehicle, it's a 904. 727s never came behind standard-duty slants.
Click to expand...
My 85 d150 came with a 727 stock and original. It's the Lowest gvw version they made, definitely nothing "heavy duty" about this one...
 
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