1999 Astro issue..
The problem is that at times, the speedometer jumps around while at cruising speeds. When it's doing this, the car stumbles/surges as if it's trying to find a lower gear if you try to accelerate even gently. When you put the pedal down to the floor, it makes it much more apparent. At around 40-45, it seems like it tries to go down into first gear. This issue doesn't happen at all in first gear which makes me for some reason think it's a vehicle speed sensor. On older cars, I would think it was the speedometer cable, but they stopped using those in like 92 or so on these. If I remember right, I think the only VSS on this vehicle is at the front of the driveline? Hopefully you guys can help me out.
The problem is that at times, the speedometer jumps around while at cruising speeds. When it's doing this, the car stumbles/surges as if it's trying to find a lower gear if you try to accelerate even gently. When you put the pedal down to the floor, it makes it much more apparent. At around 40-45, it seems like it tries to go down into first gear. This issue doesn't happen at all in first gear which makes me for some reason think it's a vehicle speed sensor. On older cars, I would think it was the speedometer cable, but they stopped using those in like 92 or so on these. If I remember right, I think the only VSS on this vehicle is at the front of the driveline? Hopefully you guys can help me out.