4R went to daughter about a year ago, trans leaking...

You must have a very early production year '04. I have an '04 with no dipstick.



As per Toyota information 2003-2004 unsealed (4 speed). 2005-2009 sealed (5 speed). Mid cycle Seqouia refresh, carried the tranny over to all its suvs tacoma, tundra, runner and of course the sequoia
 
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As per Toyota information 2003-2005 unsealed (4 speed). 2006-2009 sealed (5 speed). Mid cycle refresh, maybe some older unsealed which were weaker than the sealed 5 speed, were replaced with the stronger 5 speed? My guess.
Pretty sure they started using WS in 04, and hence no dipstick.
 
'04 Sport Edition V8 4x4 - 5Spd Sealed. Maybe there was some kind of engine/drivetrain configuration that dictated who got which transmission.
 
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