Any of them. I have the Innovate (3rd link).

But you better be fully prepared before jumping into this. You have to have a laptop for starters. And you have to have a way to log RPM'* to match the data run.

AND you have to have a way to USE that data to create a custom PCM. So I suggest you look into ALL ASPECTS of this before popping that kind of cash on a wideband O2.

would a tuner or a custome pcm be better for my car. and where can i get the one that will work best

you cant get a tuner for your year

GMTuners aka sinister performance is the only ones known to burn the OBD 1-OBD 1/2 PCM'*

GMtuners/Sinister is the only COMMERCIAL way.

DIY can be done by purchasing equipment, software, and files for quite a bit out of pocket.

Research is the key. Pick your path forward before you spend money on anything.

i didnt think u could get a turner so i quess i was right.
i will probably go with something from sinister

should i get a whole new pcm or is there a chip or one that plugs inline
between the pcm and the connector. which is best.

You have to send an Eprom to him. You also need to know exactly what you want done to it. the best way is Dyno with Wideband.

Go to www.gmtuners.com and read about it. All the information is there, including the form you have to fill out.

today i noticed what i think is first gear slip. i made a turn and was monitering kr on my
scanner and when i goosed it out of the turn the rpms went up then the tranny cought
and barked the tires. i got a 155k on motor and trans. the trans fluid was changed at
105k. should i change fluid again, also i have seen something about a trans mat. that
straps on the trans housing beside the block to reduce false knock, is it worth buying?

I think it might be time to put your power-adding ideas on hold and address the trans.

I've never heard of a 4T60E producing false knock.

You said it happened while cornering? Any chance the fluid is low? I thought I've heard of underfilled transmissions acting up during hard cornering and acceleration.

i made a turn at a stop sign and once straight i punched it. i checked the fluid it was good. . i think as soon as i get taxes back i will rebuild my trans. and install a shift kit. and maybe a stall converter along with a custom cam at the same time.