Originally Posted By: BrownBox88
Added the Instant Fixx and the Shudder is gone. I wanted to know what other people had to say as far as their experience with this stuff or what they've heard.
ATF was changed within the past 1000 miles. Plugs and wires also within that mileage.
Car always shifts smooth, it was the lock up Shudder.
Thank you for not providing that background information beforehand or for not being clear in your question.
In some cases it works, in some cases it works for a short period, in some cases the tranny gets replaced.