It has the 4.3l v6. I am getting about a baseball sized puddle after a day of sitting. Its dripping from where the transmission connects to the motor and is worse if i park on an incline. Any suggestions on what it is thats leaking? At first i thought it was the timing cover seal because there was a ton of old oil buildup around it but once i cleaned it off i havent noticed any new oil leaking from there. Just dripping from the rear.
It is your rear main seal (crank seal)
SOURCE: antifreeze leak on 97 chev blazer
check the heater hoses and the freeze plugs in the back of the engine next to the firewall,also perform a pressure test.
SOURCE: 2003 GMC YXL DENALI - "Service Ride Control" Error message
check youer air shocks for leakes and rear hight sensor
SOURCE: is the rear main seal on a 1999 gmc yukon a 1
its a one piece. should be the metal one with the rubber inside seal. of corse you gatta pull the tranny but its a good time to change fluids and maybe slap a new torque converter in. changing the rear main is pretty easy after the tranny is out.
SOURCE: Tranny fluid dripping off the drive shaft still!
Hi!!
Check that the transmission is not overfilled, if OK, could be that the seal got damaged (which is very easy to do) when installed or when inserting back the drive shaft. I use the old seal to align the new one, a piece of wood and a rubber hammer to drive it in, always checking that is going straight. Before inserting the drive shaft, clean it good and lubricate w tranny fluid, that reduces the friccion when inserting it back.
Hope this help you fix your leak. click below if helpful. Good luck.
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SOURCE: Have a 92' GMC, XC, K1500, 4X4, 5.7 350 engine
Unfortunately, you hit the nail on the head, i assume being a 1992 model, that the transmission has not been overhauled or rebuilt in it's almost 20 years of service. If it hasn't you have done very well.
It is normal wear and tear in your case, not being overworked, but just by doing its job. In an automatic transmission there is clutches, not one (like a manual) but several, and they are immersed in the oil (they are called wet clutches, for this reason), now because they are in the oil, they tend to last longer, but as they wear (similar friction material as in a dry clutch) the dust and small particles are absorbed by the oil and it degrades the oil as well. Thats why I always recommend and a firm believer in regular servicing, but if this is the first time you have had a rebuild especially in a 4 x 4, then continue what you have been doing.
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