brando_05

Ran up to my auto parts store and they ran an OBD scan and everything came up fine no codes for engine or tranny. I first noticed the knocking when going into or out of overdrive and then noticed it from first to second. The lucas tranny oil additive completely fixed first to second but I am still experiencing issues with overdrive. It give a pretty hard knock when I am driving at 60mph then hit the gas and it downshifts. Sometimes going into overdrive I feel a slight knock but nothing like shifting out of it while accelerating. The next steps I’ve read would be a transmission filter change. Is this a good or bad idea? I picked up a new filter and gasket and some mercon V and then was told by someone that may damage the tranny even more.

Any help is greatly appreciated! Thanks again

Thanks for the detailed report. I am not wanting to invest much into this truck, I am primarily getting it ready to sell. Is the OBD report the same diagnostic that you can run at auto zone for check engine lights? If so I would want to get it looked into myself before going into a shop. Also I did a quick search for “anti-knock filter” All I found was the knock sensor on the engine, is this what you are talking about or are you talking about the transmission fluid filter?

I’m doing my best to learn, thanks for the help!

Also I added some Lucas transmission fluid additive and it seemed to help some but hasn’t solved the issue entirely.