904/904 lockup

[Richard Kennedy]

I was wondering how to identify a 904 and a 904 lockup transmission.
Is there a physical difference or maybe something in the serial #.
Thanks in advance for any help.

Richard Kennedy

 

[oldkimmer]

.................A non lock up has splines all the way to the end of the input shaft........a l u will have the last 3/4 in smooth.............kim......

 

[65Valiant310]

Got a pic we could reference?

 

[604]

It is very very obvious. Smooth shinny tip to the input shaft on the lock up one. Would be nice if one could tell from the outside, but I have never figured out how.

 

[Richard Kennedy]

Thanks for the help I will be picking up a 904 lockup today for free.
Was told that it cam out of a 79 Aspen that had 36K on it. I will also be getting the engine from the same care a slant super six for $400.00 They have been sitting in a barn since 1982 I hope they are not locked up.
Thanks again for the help.
Richard Kennedy

 

[Moparhead64]

Input spline on a non-lockup looks like a manual 4 speed input shaft .