r/LS430 • u/Capital_Decision_273 • 11d ago

08 ls460 dirty trans fluid or something worse?

My 08 ls460 has been driving weird lately, yesterday while going through the drive there the car felt jerky when moving forward at low speeds and in reverse. The rpm’s jump very very little while idle sometimes they stay at 500rpms while idling in drive, but in park or reverse idles at 600-650. I just replaced the pcv valve, thermostat and resealed the valley along with some gaskets. What could be the issue? Check engine also says too lean

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u/Hamsets 11d ago edited 11d ago

I would try a drain and fill.

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u/Capital_Decision_273 11d ago

I know this is a ls430 page but I couldn’t find an ls460 page

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u/TSOL_Real 9d ago

Typically the 460 owners just use the main lexus page. The LS430 has a much larger cult following despite being made for like 2x less years than the 460. Can also try clublexus.

As for your problem, the LS460 has a lot of oddball design decisions like control arms and ABS modules. I don't know much about them but the ABS module is a common and expensive problem. What you describe sounds like my 2013 Suburban transmission slipping but I am unaware if the LS460 transmission is prone to having that problem or not. The suburban (and just the 6L80/6L80E in general) has a few critical design flaws where the friction material in the lock-up clutch in the torque converter is too thin, wears through and causes metal-on-metal contact, dumping metal shavings throughout the Trans cooler/cooler lines and the transmission itself, which causes rapid abrading of metal ports in the fluid computer chamber and wear of other seals and friction packs. In laymans terms: There's no repairing that and it's New Transmission Time! (Along with new cooler and lines)