Thread: Auto Trans Fluid Temps

There have been many posts on ATF operating temps, but I have a slightly different query.

On my D2 TD5 with 4HP 22 auto I have had fitted a small rear extension to the auto sump, and my temp probe is inserted horizontally from the rear into this - main reason being for probe and wiring protection for off road.

I also have an excellent replacement front trans cooler supplied and fitted by Auto Trans R Us in Balcatta.

Ashtrans advises that 77-93C is the normal operating temp range and 66C as the minimum recommended.

Query for Comments/Responses - It has been suggested by some that the location of my probe will provide a lower temp reading than would normally be expected, and this thought is consistent with the readings that I get (rarely above 60C for normal city/highway driving and highest recently 66C towing the 3T brick uphill).

I'm still unsure if this lower end of the range is due to the cooler, the probe location, or a combination of both. I have purchased a Derale ATF thermostat but am a little reluctant to install it if it will mean making the oil a little too warm as the oil is restricted from the cooler until about 180F/70C.

My trans has now done 274K so is at the outer range of normal life expectancy.

Cheers

There was a thread about this recently.
AFAIR there is a spare port on the RH side near the outlet for the cooler and this can be used.

regards Philip A