98 4.3 blazer leaks trans fluid out of vent tubei

1998 CHEVROLET TRAILBLAZER
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VEGADAN
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1998 blazer with 4.3 4x4 automatic with 120k miles,there is a breather tube coming up in the rear of the motor with a vent cap like on a differential and trans fluid is coming out of it at higher speeds like 2000rpm,i just traced the hose to the top of transfer case and it is mated with 2 other hoses 1 goes to pvc port and has vacume,and the other went under the battery,do you know why i would get oil out of this breather tube ,i just got the truck and the owner said they changed trans fluid and filter,i am stumped
thanks,Dan
Mar 19, 2007 at 5:59 PM
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2CARPRO JACK
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Could be over filled.There are 2 large plugs in the back of the t-case,1 is a little higher up than the other.remove the highest one, fluid level should be at the bottom of the threaded hole. If it is higher let it drain and re-cap it.Run the vehicle and pull the plug again, if fluid runs out then you might need to replace the seal between the trans and transfer case
Mar 20, 2007 at 7:48 AM