700r4 identification and differences?

[Rileys68Camaro]

I'm trying to determine exactly which 700r4 I have, but not having much luck finding numbers or descriptions.

I was told it came out of an 87 Firebird. Wouldn't this be a standard 700r4?

Or would the tail housing be longer/shorter and would this affect the mount points?

Thanks!

[MonzaRacer]

You want 87 up 700r4 or the next version the 4l60, 86 down were weaker.
On the side there should be codes stamped, these properly decoded or if it even has the tag with the julian date tag would even be handier.
There are other indicator but I need to dig up my books, I think the splines engaging the converter are different. One big update for 700s and 4l60s are the use of the newer 4l65 5 pinion planetaries and updated and reinforced sungear shells. Give California Performance Transmissions a call you can talk to the trans man him self Art Carr. Oh he answers the phone too.