727 will not kickdown

You said you’ve been chasing this for several months, but your builder just had a heart attack. I would have taken it back to the builder after the kickdown linkage didn’t have any effect after adjustment. Either way, the car needs to go back to the builder so he/she can look at it as soon as they are able. If you paid somebody to put it together, they should be responsible to make it work properly. Just my two cents worth.