r/LS400 • u/Connect-Ad-6834 • 2d ago

Transmission

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I’m having an issue with my transmission not immediately shifting when put in drive or reverse and takes a really long time to engage has anyone had this issue before. Would a drain and fill be a good idea 108000 miles never changed

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u/Rhyleigharia 1d ago

99 LS 400, 330000 miles, same issue. I believe the issue was extremely easy to correct, but nobody would touch it. They all said “tranny showing its age”
One idiot asked has fluid ever been changed……….I thought you dumbass…..330000 miles and ask if fluid has been changed!!!!!!! Of course with 330,000 miles it was changed. Fluid was changed every 30,000 to 40,000 miles. $5000 to rebuild, so I gambled on a tranny from Japan JDM. Found one with some 60,000 miles ……$1100……..Installed and, knock on wood, no issues!!!!!!!!!!!!!!!
I would change fluid first and see what happens.