727 and 904 Transmission Comparison
 

I've noticed lately (Not just on here, but on other forums and even out in the real world) that many people get stumped on the differences on a "727 TF" and a "904 TF".

To view the pictures, just click on them, and you can also zoom in from there for a closer look.

http://img707.imageshack.us/img707/8...7904034.th.jpg

727 on the left 904 on the right (output shaft hanging out)

This image shows a side by side comparison of a Small block 727 and a Small block 904. Notice the bulge on the top right side of the 727? That's one way to tell the different when the transmission is in the car.

Also note the "rib" on the 904 where the end of the bell meets the case.




http://img709.imageshack.us/img709/7...7904036.th.jpg

http://img709.imageshack.us/img709/1...7904038.th.jpg

727 in the first picture (empty case) 904 in the second picture (has the front pump in it)

In these two pictures the bell housings look nearly the same, but yet are different. The top has a different formation to it.

Also note that the dowel pin hole on the 904 is on the "driver" side, where as it is located on the "passenger" side on the 727.


I hope this will help clear up some confusion on ID'ing 904s and 727s. I've been studying these things for about 2 years now, and have only learned the tip of the ice berg. These transmissions are very mysterious.

If anyone wants, I can start a thread on the rebuilding-rebuilding process of my 904 (the one pictures). Long story, but its needing a second rebuild.


Also, one last note:Both 727s and 904s ARE torque flights.


-nick

Great post blue!
No need to ask I'm sure, get started on the thread, very interesting stuff!

Thank you.

Good info Nick!

Thanks for the info.

great info thanks

I like my A904LA. It's still for sale and doesn't break my back when I lift it up.

Thanks for the info! Great information to have!