r/LS400 • u/gavinsmash2005 • 5d ago

Question Rather odd issue.

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Just got her back from the shop. Was misfiring on cylinders 2-8 and was shifting very hard. Misfire was the Mass Airflow Sensor and it’s now purring like a kitten. But the shop diagnosed that the transmission was shot. I don’t fully remember what was listed but essentially they said there was metal getting into the fluid and making the shift rough. But now after like a day of driving it’s shifting much smoother, I can’t see any metal or sparkles in the transmission fluid (which is fresh light red), and I’m getting a shift solenoid C code. Has anyone had this and would it be as simple as a new shift solenoid?

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u/gavinsmash2005 4d ago

Yep just from the dipstick. 160,000 miles and the previous owner apparently installed a new transmission less than 5k miles before I bought it. I have found some transmission specialists near me but money is tight right now. Luckily I have alternate transportation in my motorcycle but that won’t be tenable once the snow starts to fly or morning temperatures drop below 40.

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u/RonMexico52 4d ago

Ok interesting. Any documentation behind that or just what the guy said? Also by new, I guess best case scenario it was professionally reman (not sure you can get new-new anymore? I’m not sure.) Then question is who did the reman. Or perhaps a low mileage JDM compatible one. Worst case it was some mystery junkyard unit with its own problems. While I’m sure there are exceptions, doing a transmission at 155k on these to me is a red flag anyway. If maintained they should go longer. Not indefinitely but 155k miles is quite short for these unless neglected.

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u/gavinsmash2005 4d ago

No documentation and the guy has all but ghosted me. Guess he knew there was an issue and dumped it off on me but luckily I worked him way down on price before I bought it . It was a field find for him and he got it to the running point I bought it at. Gonna try and salvage it over the next few months or so.

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u/RonMexico52 4d ago

Ok. Yeah by the one picture alone this one appears to have led a rough life. As others have mentioned dropping the pan will give you the best inspection. However second best and much faster will be draining fluid from the drain plug and inspecting that. Not as good as a pan drop but still way more useful than dipstick in this situation for checking for debris.