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You need to replace the input seal on the t-case, not the output seal on teh tranny. There is a void where the adapter connects the t-case to the tranny, if the output on the tranny is leaking it will fill up that adapter, and that is no big deal, in fact you need some tranny fluid in there to lubricate the governor. However you need to fix the input seal on teh t-case, otherwise the t-case will get overfull of tranny fluid. Most GM t-cases take ATF.
The vacuum switch controls your 4wdr system, specifically your vacuum activator located on the passengers side fender below the battery. There are three hoses, one hose provides vacuum to the system, one hose provides vacuum to the vacuum modulator under the battery, and the 3rd hose is a vent hose.
You MUST clean out all the fluid in the hoses. Not only does the fluid plug up teh vacuum system for the 4wdr, it is also connected to your heat-a/c vacuum controls. If you have too much fluid it will get into the heat-a/c controls and you will replace them to fix the problem.
Fortunately, you may have caught the problem before it affected your heat-a/c system.
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'87 S10-Blazer - SOLD
'93 S10-Blazer 4x4x4 - Sons DD, engine swap is done.
'00 S10-Blazer 4x4x4 - My
RE: Transmission fluid loss
