i have a 90 rs with the 3.1 v6 also its a automatic, now im thinking about putting in a b&m megashifter which one would i need? what tranny do i have? and how would i go about installing it?

 

you have a 700r4

 

You have a 700R4 transmission. You need this one.

 

does that come with install instructions or how is it done is it a quick change or a real pita?

 

It shouldn't be too difficult. Though someone who has actually installed one should probably chime in on that before you take my word for it. From what I understand its pretty easy and there are some instructions in the box.

 

easy to install. about an hour .out with the center console, unbolt old shifter , disconnect and pull out old shift cable, run new cable. bolt new shifter . adjust cable. i had a few probs with the new cable bracket, but for the most part it is just a r&r job. you may also have to play with how the plate fits on your console but if you have any probs pm me and i will try to help. i can give you some tips on that cable bracket aswell

 

Imo, get a transgo shiftkit instead.