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Want to flush my 99 f150, but mechanic says no.
I have never had a transmission flush because I took some bad advise. Now when driving around 40-45 mph and above, it shakes a little when I accelerate lightly or when I go up hill.
The mechanic said that it is very possible that if they do a complete flush, that it would stop working. He said that I should check my fluids and add "Lucas Transmission Additive".
What are your thoughts?
Oh, I have a 99 f150 5.4 V8 and 97,000 miles on it.
Please help
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