[JohnGD]

Is yours 4-cyl with the A140e transmission? If yes then there are two chambers. Recently a member had the diff chamber ran dry and ruined the differential.

See also this DIY on differential fill and drain plugs:

DIY: 5S-FE Transmission Fluid & Strainer Replacement...

DIY: 1996 Camry Transmission Fluid & Strainer Replacement Procedure 5S-FE (GEN 3) I completed this procedure at 207,000 km on my 1996 Camry 2.2L automatic (5S-FE engine). The transmission fluid was turning a brownish-red colour. The transmission fluid was previously flushed at 145,000 km. No...

www.toyotanation.com

 

[JohnGD]

A breaker bar from the top side or an extendable ratchet may help provide better torque on the fill plug. The standard ~7" ratchet sometimes doesn't cut it especially if the plug's been on there for a while. And don't go overboard tightening these. And make sure the socket is fully seated to prevent rounding the plug out.

1/4 in. x 3/8 in. Dual Drive Extendable Ratchet

Amazing deals on this 1/4In, 3/8In Dual Dr Extendable Ratchet at Harbor Freight. Quality tools & low prices.

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1/2 in. Drive Extendable Ratchet

Amazing deals on this 1/2In Dr Extendable Ratchet at Harbor Freight. Quality tools & low prices.

www.harborfreight.com

 

[JohnGD]

Check also many YT videos. The newer U-series are designed correctly, in that they don't use a silly separate diff chamber like the older, more bulletproof A-series.

BTW, for transmissions with dipsticks, I'd suggest checking the ATF level on a few occasions before draining to make sure it's in the HOT range. Then measure what you drained out to put approx the same amount back in to quickly get the level into the ballpark.

The process is similar to the A140e otherwise.

Filter and gasket kit for the 2005 Sienna. Beck/Arnley and Wix are popular items (heart symbol):

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I also have a 2005 Sienna.