ATF/Diff fluid combo flush?

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Panic set in when I realized I've done drain & refills for the trans every 15k on a'02 Avalon, but never changed the differential. I can't find a drain plug, but on the driveway, anything can happen. I had the system flushed at the dealer once. Does the differential fluid get "changed" when a flush is done and/or a drop and fill?
 
Um, isn't the Avalon front wheel drive, and therefore the differential and transmission are one unit. Only rear wheel drive or 4 wheel drives have separate differentials.
 
Originally Posted By: ccs79
Um, isn't the Avalon front wheel drive, and therefore the differential and transmission are one unit. Only rear wheel drive or 4 wheel drives have separate differentials.

A lot of Toyotas have a separate final drive unit.
 
Originally Posted By: The Critic
Originally Posted By: ccs79
Um, isn't the Avalon front wheel drive, and therefore the differential and transmission are one unit. Only rear wheel drive or 4 wheel drives have separate differentials.

A lot of Toyotas have a separate final drive unit.


And one of those "lot" is mine.
Now the question is how to service that dif.
I'm thinking of doing a dino DexIII w/AutoRx, run it for 5k miles (or whatever the instructions state), then go to a synthetic DexIII as the spec calls for.
Sesnsible?
I can't believe I missed this for 95k miles.
 
fill_plug.jpg

Your fill plug is sealed (arrow). Follow the edge of the differential down and you'll see the edge of the differential drainplug. Hex plug 10mm I think? The trans and diff are one unit and share the same fluid on your model Avalon.
 
Most Toyotas share the final drive fluid. One exeption I know of is the Corolla w/ the 3 speed auto transmission. It was marketed as the VE (value edition) and has gear lube at its axles. I wouldn't fret over changing this, as gear oil can be good for the life of vehicle as there is truely never any heat damage here.
 
Originally Posted By: csaxon
fill_plug.jpg

Your fill plug is sealed (arrow). Follow the edge of the differential down and you'll see the edge of the differential drainplug. Hex plug 10mm I think? The trans and diff are one unit and share the same fluid on your model Avalon.


Thank You - One heck of an Avatar!
 
My dad's 1997 Lexus ES300 was built this way.

Draining out the old stuff at 150,000 miles and putting new synthetic in made the car much quieter.
 
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