[yako]

Encontre esto en la web por eso pregunto.Entonces no sacaria nada si solo cambio el switch de la transfer y no el sello, como se explica que la transfer este reeeeellena con ATF ????

http://www.john-stichnoth.com/SonomaT-caseSwitch.html

Drop in Transmission Fluid Level
When the transfer case input shaft seal fails, ATF moves from the transmission to the transfer case. The transfer
case fills up with excess fluid, which depletes the ATF in the transmission. The transmission fluid dipstick may not
show much of a drop in fluid level over short periods of time, but eventually you'll see noticeably lower fluid levels.

One thing to keep in mind, however, is that over time, a bad input shaft seal will continuously over-fill the transfer
case with ATF. This will probably "test" the transfer case vacuum switch, as its seals are tasked with keeping ATF out
of the vacuum lines. So replacing only the vacuum switch and not the input shaft seal will possibly bring you back to
the same problem again.

An easy way to check the transfer case input shaft seal is to check for excess ATF in the transfer case. Simply
unscrew the filler hole (upper bolt) at the back of the transfer case:



The photo above is from the transfer case of my Blazer, which had similar issues (read about it here). This is actually
coming out of the fill hole, not the drain hole. About 16 ounces of excess fluid poured out. On the Sonoma, there was
a bit more than that: