So I have been debating whether to get an AT cooler or not. I have read a lot on here about this. What I have read here is that if you tow, which I do not, or if you go off road (which I do alot) you should use a supplemental cooler
When I bought my 08 earlier this year with 60K, it has the dreaded "shudder" which I discovered before I modded it thankfully, it was bone stock CPO when I bought it
This tells me:
- the service interval for WS if less than 60K since changing the fluid resolved the issue (for now)
- a bone stock FJ that does not tow can still fry its tranny fluid pretty fast
- ...or... perhaps the prior owner abused it although that does not seem consistent with an FJ that was dealer serviced like clockwork as per the carfax
I bought a scanguage 2 and set it up just in time for a off road run yesterday. It can read tranny fluid temp on FJ's with an entered extra code
Here is what I saw:
- tranny fluid temp of around 150-180 with light secondary hwy driving
- nothing more than 180 off road (in 4 low at all timess off road), even longish steep rocky climbs, it would maybe go up 5 degrees under loads off road vs flat dirt trail. Even towing a Jeep
out of muddy ruts for 100 yds had no impact
- The temp rise very fast going up hills on pavement in 2wd, I would get peak temps of 200-210 without being aggressive at all or heavy on the gas, despite outdoor temps of 35-40 F
These trannies run hot it seems (c/w what I have read here before), without much provocation, so:
-either they should all get a cooler?
- or toyota WS is fine with regukar temp spikes of 220-230 (where I am guessing it would get in warmer weather)
Thoughts? Does anyone know the temnp at which this fluid starts to fail??