1999 Silverado. Power seat slides about 1/4 inch back and forth. Can make this happen by hand or when I stop the truck I the seat slides forward and then when I leave the stop sign/stop light it slides back. Looked around under the seat, all bolts tight. Seat just slides on the rails. What's going on?

 

Have you lookat at the teeth on the motor?

 

I was thinking the same thing. Do you know if they are visible when I remove the seat?

 

Man..what a problem...the seat needs to be flipped over to find out wtf...its easy to remove...but takes some inverted torx sockets

 

boy this can get bad. I got the sockets took the seat out and took the scew drives out and found out that something on the square drive got ate up cause i picked pieces out. So I called dealer and they said can only order the whole bottom part of the seat for $300 or so[:@]. anybody had this same problem? I think there will be more.

 

I told ya...they suck...look for a used base maybe...but its a nitemare to install as well,so I'd hate to do it twice

 

I had this same exact problem on my 2000 gmc sierra. There is however, finally, a guy on ebay selling kits to fix them for $15, I put one in about a week ago that took all the slack out. Much better than the $1,100 the dealer quoted me.
He lists them as: GM/Chevy Power Seat Unwanted Movement/Play Repair Kit