trans temp switch location

hi all can anyone tell me the location of the trans temp switch in my 1988 3/4 ton R20 suburban fitted with a th400 transmission.
thanks in advance xxxxxl
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
Add image file
Upload 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.