Transmission slipping after atf change

[stevenK Junior Member Find all posts View Profile Close stevenK]

Hey guys, Yesterday I changed my auto trans fluid , I cycled through 11.5 litres from the front radiator connection , as mention in other posts, since the new fluid went in the transmissions been slipping , I resorted to putting the old fluid back it just to drive it!

any reason why this would happen , used Penrite full synthetic as recommended here

[gxl_d4d Advanced Member Find all posts View Profile Close gxl_d4d]

How do you know the transmission is slipping? What are the symptoms. Also, how did you set the fluid level?

[red hilux Member Find all posts View Profile Close red hilux]

Penrite LV or FS?

i changed mine to FS. tranny didn’t like it. Held gears out longer. Quick to come out of torque lock up.

Changed back to genuine and it’s problem solved

[krypto Avid PP Poster! Find all posts View Profile Close krypto]

If the gearbox worked with the old oil, then something wasn't right with the oil that you used.

[carco Advanced Member Find all posts View Profile Close carco]

I hate Penrite oils. If it worked OK before and the only thing you did was an oil change then there you go.
Anither sad Penrite tale.

[stevenK Junior Member Find all posts View Profile Close stevenK]

the previous owner had never changed the ATF the car has 330k , he said he thought it was a sealed unit and didnt need a service, the ATF that came out was black a the ace of spades and as thick as tomato sauce.

[Burty Lurker Find all posts View Profile Close Burty]

Having trouble with auto trans shaking when in reverse when cold but dosn't do it all the time.
toyota told me that they would have to pressure test it and depending on outcome trans may have to come out.
prado gxl 2008 has only done 107k and trans has never been serviced was told it is a sealed unit.

[Murdoc Lurker Find all posts View Profile Close Murdoc]

the previous owner had never changed the ATF the car has 330k , he said he thought it was a sealed unit and didnt need a service, the ATF that came out was black a the ace of spades and as thick as tomato sauce.

Hey mate, unfortunately this isn't super uncommon.

When ATF doesn't get changed for that long it breaks down from being burnt and becomes full of particles from the transmission itself. These particles end up being the only thing in the transmission that stops it from slipping, which explains why it started when you put in the new fluid, and why I'm assuming it stopped slipping when you put the old stuff back in.