I'm not sure what to make of this issue. Maybe someone else here has seen this...

First of all, the car is an 4l60e, been rebuilt less than a year ago and shifts just fine. Running a non-lockup 2800 stall converter. The driveshaft was swapped to a stock LS1 aluminum unit. Not sure if any of that makes a differance but there it is.

Here's the problem, the car runs perfect, bit of a rough idle but nothing worrysome. For the first few miles of diving everything is normal. But after a mile or so when I come to a stop the speedo needle doesn't go all the way to 0, it stops at around 5-6 mph and flutters. I can rev a bit, put the car in park, and it won't change. When the car is in motion it is reading the correct mph (based on gps) but at a stop its like it thinks it's moving. I don't think it's the gauge cluster.

Is this an issue with the VSS, the tranny, or something more serious? The car doesn't feel bad at all but it's a strange issue.

 

May be some electrical interference with the VSS signal. Let's move this off "...... Engine Tech".

 

No problem - wasn't sure where to put this anyway.

If it is electrical interference - what would cause that? Is the VSS bad?