94 chevy g10 van shifting promlem

I HAVE A 1994 CHEVY G10 WITH A 4.3 VORTEC V6 AND AN ELECTRONICALLY
CONTROLLED 4SPD TRANS WITH OVERDRIVE. IT HAS AN INTERMITTENT SHIFTING
PROBLEM. SOMTIMES IT WILL SHIFT FINE AND OTHER TIMES IT DROPS INTO WHAT I
BELIEVE IS 2ND GEAR AND WILL NOT SHIFT. I HAVE REPLACED THE SPEED SENSOR
THAT IS LOCATED ON THE DRIVERS SIDE REAR OF THE TRANSMISSION. I WAS TOLD
THIS IS THE ONE FOR THE SPEEDO. I WOULD GREATLY APPRECIATE ANY HELP.
THANKS

On Fri, 30 Dec 2005 10:34:51 -0500, "jillanda"
> wrote:

>I HAVE A 1994 CHEVY G10 WITH A 4.3 VORTEC V6 AND AN ELECTRONICALLY
>CONTROLLED 4SPD TRANS WITH OVERDRIVE. IT HAS AN INTERMITTENT SHIFTING
>PROBLEM. SOMTIMES IT WILL SHIFT FINE AND OTHER TIMES IT DROPS INTO WHAT I
>BELIEVE IS 2ND GEAR AND WILL NOT SHIFT. I HAVE REPLACED THE SPEED SENSOR
>THAT IS LOCATED ON THE DRIVERS SIDE REAR OF THE TRANSMISSION. I WAS TOLD
>THIS IS THE ONE FOR THE SPEEDO. I WOULD GREATLY APPRECIATE ANY HELP.
>THANKS

1. Turn off your caps lock key. All caps is SHOUTING and we don't like
it.

2. What are the fault codes from the PCM? You did get codes *before*
wasting money on unneeded parts, right?