Identifying an unknown transmission?

[Akodo]

Allright, so I bought an 85 T/A that has had a 355 installed. I took a look at the tranny, and it doesn't appear to be stock, it looks different than the one in my 86, anyway. So how do I determine wht this thing is? I assume there are code numbers somewhere on it, but where? How do I decode them when I find em?

[1989Formula]

is it a 3 speed or a 4 speed ?

it could be a th350, th400, th200R4 or 700R4

if you cant find # on it look at the pan

Image Number, Transmission(s) , # Pan Bolts

1, Aluminum Powerglide, 14


2 , TH200 (Metric), TH200C (Metric), 11


3, TH250, TH250C, TH350, TH350C, TH375B, 13


4 ,TH375C, TH400, TH475, 3L80, 3L80HD ,13


5 ,TH200-4R ,16


6 ,TH700-4R, 4L60, 4L60E ,16


7 ,4L80E ,17