Which transmission.

[lsrguy2007]

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.

 

[toolmanmike]

904

 

[Demonic]

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.

 

[TrailBeast]

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.

 

[Professor Fate]

Unless you have a truck or maybe a taxi/fleet vehicle, it's a 904. 727s never came behind standard-duty slants.

 

[lsrguy2007]

904

Thanks!

 

[lsrguy2007]

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.

OK. Thanks!

 

[lsrguy2007]

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

Thanks for all of the information. I'll get the 42Rh gasket.

 

[lsrguy2007]

Unless you have a truck or maybe a taxi/fleet vehicle, it's a 904. 727s never came behind standard-duty slants.

OK. Thank you!