Replacing Transmission Modulator Valve

Hi
I have a 1990 Ford Ranger 4.0L V6 and the 4ALD transmission.
I need to replace the modulator.
What is the best way to do this. I've heard that some people remove the
carpet and remove the plate in the floor of the cab and get to i that way, or can I work from under the truck?
I'd rather work under the truck but heard that things are tight with the CAT
Ideas?
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.