93 Lightning won't shift 3rd.
 

Hey guys,

When I floor my Lightning in drive, it won't shift into 3rd.

When I shift it manually, it works about 75% of the time.

The trans is not slipping at all, it just won't go to third.

I have to let completely off and it shifts, but under WOT, no go.

any advice, it seems like a little sensor or something minor???

thanks.