Floored but no go!

[03 Red-wagonsilverado]

Was wondering if anybody has experienced this same problem I swapped my 4.3 out for a lq9 an when it was finished I took it easy for the first week an when I finally did open it up it shot up to 6krpms but didnt move from a 60 punch it will do this at any speed below 70 but it will fly if I do a 70 punch no mods have been done to the stock 4l60e could it be the engine is too much for the tranny? Or could it be the tune? Any advice would be greatly appreciated as this is an annoying problem because nobody ever wants to do a 70punch lol

[bootlife]

Sounds like clutches slipping

[farmtruc]

if the trans is shifting normally and going thru the gears correctly, the trans is probably slipping; check fluid level.

[03 Red-wagonsilverado]

1st gear is the only one that doesn't shift correctly I have to give gas to 3500 to 4000 rpms or 25 or 30mph an let off the gas like if it was standard for it shift into 2nd any thoughts on that

[farmtruc]

is there a vss signal coming from the pcm?
use a scanner; or does ur speedometer gauge work?

[03 Red-wagonsilverado]

Yes the speedometer works fine no problems out of that

[bootlife]

Both times my 3/4 went out it was like shifting in to neutral, I'm thinking that could be your converter. I had a maxima that had trans slip and it would pull till you started to put power down then it felt like it would just let go, like free rev. I'm gonna say converter or fluid preasure. Hook it to a tech 2 and see what you come up with. I wouldn't drive it tho.