95 4.3W - transmission/brake fluid in vac line - collecting in vac reservoir??


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Herešs something I donšt imagine you see every day...
I have a 95 4.3W series Jimmy that has been Œleakingš transmission fluid (might be brake fluid but I donšt think so based on the deep pink colour and smell) - itšs collecting in the under-the-hood vac reservoir Œballš.
Can someone explain to be what might be happening?? Both the motor and transmission are nearly brand new but Išd like to know what to Œchatš about when it goes in for the warranty work if needed.
It seems like itšs been a little low on transmission fluid lately and I canšt find any leaks in the pan, cooler, or lines ­ except today when I checked a host going to that vac booster ball and found the pink stuff.
I am stumped but it wouldnšt be the first time.
Thanks and take care, Andrew.
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<HTML> <HEAD> <TITLE>95 4.3W - transmission/brake fluid in vac line - collecting in vac reservoir??</TITLE> </HEAD> <BODY> <FONT FACE="Verdana">Here&#8217;s something I don&#8217;t imagine you see every day...<BR> <BR> I have a 95 4.3W series Jimmy that has been &#8216;leaking&#8217; transmission fluid (might be brake fluid but I don&#8217;t think so based on the deep pink colour and smell) - it&#8217;s collecting in the under-the-hood vac reservoir &#8216;ball&#8217;.<BR> <BR> Can someone explain to be what might be happening?? &nbsp;Both the motor and transmission are nearly brand new but I&#8217;d like to know what to &#8216;chat&#8217; about when it goes in for the warranty work if needed.<BR> <BR> It seems like it&#8217;s been a little low on transmission fluid lately and I can&#8217;t find any leaks in the pan, cooler, or lines &#8211; except today when I checked a host going to that vac booster ball and found the pink stuff.<BR> <BR> I am stumped but it wouldn&#8217;t be the first time.<BR> <BR> Thanks and take care,<BR> Andrew.<BR> </FONT> </BODY> </HTML>
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I know youšre all thinking that itšs just a simple matter of an overfilled transmission... Išm not sure itšs that simple. I will triple check it but I donšt think the fluid level is too high. Maybe some hard braking caused the fluid to travel up the vent line? Is that possible??
Thanks. Andrew.
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<HTML> <HEAD> <TITLE>Re: 95 4.3W - transmission/brake fluid in vac line - collecting in vac reservoir??</TITLE> </HEAD> <BODY> <FONT FACE="Verdana">I know you&#8217;re all thinking that it&#8217;s just a simple matter of an overfilled transmission... &nbsp;I&#8217;m not sure it&#8217;s that simple. &nbsp;I will triple check it but I don&#8217;t think the fluid level is too high. &nbsp;Maybe some hard braking caused the fluid to travel up the vent line? &nbsp;Is that possible??<BR> <BR> Thanks.<BR> Andrew.<BR> </FONT> </BODY> </HTML>
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"AWN" wrote

This is a bit of a guess, but it's not uncommon for the transfer case switch that controls the front diff engagement (I'm assuming this is a 4x4, though you didn't specify that) to suck fluid from the t/case up through the vacuum lines. It's also not uncommon for the transfer case front seal to suck transmission fluid from the automatic into itself. Both the transmission and the t/case in that year use the same fluid.
You might try checking the fluid level of the t/case. If it pours out of the fill hole, then I'd say that you may have two repairs you will need to do. Replace the front seal on the t/case, and replace the switch on the t/case. By the way, the oil coming up through the vacuum lines will often destroy all of the vacuum lines, including the ones in the dash that control your heater and a/c blend doors.
Ian
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