Trying to figure out what trans that I have?

[ercwlkrs]

hey guys new to the forum and wasn't sure where exactly to post. but I have 2 questions actually.

I have 1986 Cutlass supreme v6 3.8 that I am most definitely going to do an ls swap to. I have researched and researched but I keep seeing different things. What trans is in this car? As I was researching there was a guy in a video that said that he had an ls 5.3 in front of a 200r with a 3400 stall. I thought that was a v6 trans. and it wouldnt handle a v8.

My other question is what would make a transmission literally pop out of gear when you hit a bump. I don't mean the slipping feel, I literally would have to put it back in drive. (column shifter if it matters)

 

[melloelky]

one of the easiest way for me to id a trans is to look at the pan and visually match it up looking on line
http://blog.wrenchmanrepair.com/2010/01/20/i-d-your-transmission-according-to-oil-pan-shape/

 

[Onehit]

If its the original trans its a three speed th200c. Pull it out with the v6 it won't hold up to the la swap

 

[ercwlkrs]

oh ok thanks guys. Well I guess my next dilemma would be choosing a 4l60e or an older trans that's not computer controlled. (staying carbed)

 

[MrSony]

Cant go wrong with a TH350. Drops right in place of a TH200c (TH200c: 3speed, says METRIC on the pan, 11 bolt Nevada shaped pan), can find em anywhere. Short 6" tailshaft version.
A th200r4 out of a GN/442 would work well too. MAKE SURE THE TV CABLE IS HOOKED UP CORRECTLY on whatever trans you get. TH350 uses a kickdown cable. No adjustment really, just cable at full extension at full throttle.