Tranny drain and fill - percent new fluid

[OregonLC]

I think bamachem did a pretty good job showing the trans cooler method in the following thread. Just make sure to check the fill level with it hot and the engine running (true, but also an inside joke).

https://forum.ih8mud.com/100-series-cruisers/461883-picking-up-07-uzj-monday-4.html#post6462773

edit: I'm sure you're aware, but the LC's are spec'd with three different trans fluids depending upon your year. His version shows the WS ("World Standard") version which was the last. WS is not backwards compatible (or is Type III ATF forward compatible). There was also a year or two in between when Toyota used Type IV fluid. Know thy fluid before you embark.

 

[bamabrock]

Can't the Royal Purple ATF fluid be used for all years?

 

[agaisin]

Can't the Royal Purple ATF fluid be used for all years?

what's your source for that? ws isn't compatible with other types due to differet viscosity (can dig up toyota tsbs on the topic later). I cant see how it's physically possible for anything that's ws compatible to be compatible with other non ws atf fluids and vice versa.

 

[OregonLC]

Can't the Royal Purple ATF fluid be used for all years?

I wouldn't think so. The WS is much lighter in viscosity.

Amsoil does have WS compatible fluid (ATL) as well as Type III (ATF). Not sure about the synthetic options for Type IV.

 

[agaisin]

see my post here https://forum.ih8mud.com/100-series-cruisers/494396-2004-lc-transmission-question.html#post6735561 for more complete excerpts from the TSB. Below I'll just reference the points about incompatilibity from each.

A few bullets from TC008-07:
- ATF-WS is NOT compatible with T-IV or Dexron ATF.
- 2004 – 2008 model year Lexus vehicles equipped with automatic transaxle
requiring ATF-WS.


And from TSB at original release of WS-ATF (TC009-03) there's more warnings about why not to use non WS ATF, hence my assertion that it's physically impossible for one fluid to be compatible with both since they have difference viscosity:
The following symptoms will occur if non–WS ATF is put into a WS compatible
automatic transmission:
Non–WS ATF has a higher viscosity. Because of this, response to changes in
fluid pressure decreases, lengthening shift time, causing shift flare.
When the fluid temperature is low, (approximately –40°F (–40°C), air can enter the
oil pump causing cavitation resulting in low fluid pressure.
Fuel consumption increases.

The following symptoms will occur if ATF WS is put into a non–WS compatible
automatic transmission:
ATF WS has a lower viscosity than other ATFs. Because of this, response to
changes in fluid pressure increases, shortening shift time, causing shift shock.
If WS is filled into a non–WS automatic transmission, the fluid could leak out under
high temperatures (approximately 284°F (140°C).