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Cadillac Repair/1992 cadillac deville transmission

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Expert: - 2/8/2012


Question
Hi I was wondering if their is a transmission drainage bolt on a 1992 cadillac deville. The reason I ask is because I want to completely drain the transmission. I also will put a new gasket on the transmission pan and I will change the filter. The car has 135,000 miles on it and it never has been drained. the color of it looks like dark brown but not black. Also I have oil on the bottom of my oil pan should I change the gasket out on it. The oil pan gasket has never been changed either. Thanks for any help.

Answer
Hello,

It is not the cleanest job draining the transmission. Most don't come with drain plugs and you have to take all but the 4 bolts across from each other, holding the pan up an loosening them so you can drop the pan evenly. I assume since you can see the color it has a dip stick.
See, GM got sneaky in later vehicles where the system was sealed. Oil change places did not have adapters and one was stuck going to GM to have the system flushed.

After you change filter, clean gasket material, should not be cork gasket, just use RTV, black or red for gasket. I am right handed and woul use 1/4 drive ratchet with 2" extension with my left hand to tighten so I did not break bolts off. tighten 4 across from each other. run all the other bolts up. Then tighten from center to the righ, across, the to the the left and so on. Then take your weak hand and tighten one more time. Or you can look up specs, but I never had a leak and never  broke a bolt.

As for the engine, is the oil even leaking from the pan? Valve covers are more common to leak. You could also have a rear main seal leaking and you do not even want to get into that! Try tightening the pan bolts an v/c bolts as described Degrease and unless engine is leaking seriously, leave it alone!

Recommended trans fluid change is 60K.

Now, in reality, you cannot completely drain transmission because torque converter will not empty just by pulling pan. If you want it totally clean, you can do this: have it flushed at an oil change facility. They pump all the old stuff out and put all the new stuff in. Then if you want to change the filter you can.

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Rob Painter

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Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?

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Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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