2004 GMC Envoy Tranny Problems

04 Envoy just recently had the transmission rebuilt at 115k miles. Now it seems it can't make up its mind which gear to cruise in. It jumps frequently
between 3rd and OD. Any ideas as to why it would do this?
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

GM
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
Mark Taylor wrote:

Sounds like a possible speed sensor problem. I would take it to a shop and watch it shifting on a scan tool.
--
Steve W.

Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.