weird pop sound on my lexus ISF？?
driving my isf on highway today，going around 80mph，then a 370z pull next to me. want peice of my F power. i then tap the sport mode，switch from auto to manual. then lower my gear from 8th to 3rd，on the peddle shift. then i heard the pop sound on around 4th or 3rd gear thank you in advance.
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I think your gear syncro is going bad, check the 4th and 3rd gear syncro, might be the teeth has been gone.
I have been a mechanic for over 35 years and yes we can guess all day long and tell you what it might be, but it usually is some thing else when seen in a shop and diagnosed, you will get the rite answer instead of listening to everybody's advice online and wasting your money and time buying parts that didnt work, go to a shop and stay away from the DEALER.
Take it to the shop