shift kit????

looking to do some mods to my blazer, and i have been wanting to put b m shift kit in but when i go to find one to buy they give me 3 options on what tranny i have. one is th200, th700r4, and th400. if i have 4.3 4x4 what tranny do i have? please help.... and any other mods that are worth noting please post.

mods so far,,,,,,, american thunder flowmaster, kn filter with xstream lid, and 2 1/2 cowl induction hood..

oh yeah iit is 1989 blazer

you have a 700r4

thanks.. i got it in today now just waitng to get installed

why not install it yourself? Took me less than an hour and a half for my b&m when I had my 92 (700r4) and about 50 mins on my 4l60e on my 95...It's a pretty simple install...

rlith, i have seen some of ur replies and i wil tell u that u r probably alot more mech inclined then myself. i htink i will just have someone install it for me. but thanks for the confidence