BarneyKris Posted October 20, 2008 Report Share Posted October 20, 2008 I have developed a major tramission fluid leak on my 2000 Deville DTS. A few months ago I replaced the left (based on sitting in driver seat) transaxle and did not replace the seal (used official GM manual and it did not say to do so but would have made a lot of sense, $5 seal while the whole axle was off). Anyway, I assumed the tranny leak was going to be from there but further study showed it is not the left transaxle. I only looked without jacking up the car. When I idled it in driveway for a while, including in nuetral and shifting through the gears, it never started leaking. Then I took it down the road for a mile or two at 55 and returned home and when parked it did begin dripping transmission fluid. This has become a major leak as I have added two quarts of tranny fluid twice now. From observing the bottom of the engine without jacking up the car I noticed that the transxale seal does not appear to be leaking. Nothing up high on the engine appears to be leaking. The dripping transmission fluid was coming from just left of center of the underside (while seated in the driver seat). It is just left and behind the back left corner of the oil pan and appears to be off the front of the transmission fluid pan. It also drips off the rear portion of the heavy black metal bracket that protects the manifold (two bolts share oil pan bolts). I know I need to jack it up etc. but based on that location of the dripping is there a logical spot that could be leaking? Again the front side of the trans pan and rear portion of the thick black metal bracket. Looking at diagrams in my GM manuals if I had to guess it would look like the 4th Servo Cover seal, at least based on location. Any suggestions fellas? Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 20, 2008 Report Share Posted October 20, 2008 All I can say here is to look at your cooler lines and your pan gaskets. Some mechanics use cork gaskets when they drop the pan and its wrong, if you have a cork gasket, change it to the proper seal. My pan was leaking really badly. KHE had a leaking 4th Servo Cover and I think he replaced the o-ring, I posted a photo for him. Do a search under servo and KHE and you will find it. Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
OynxSTS Posted October 20, 2008 Report Share Posted October 20, 2008 Sorry to be the bearer of bad news... BUT a leak out of the drivers side axle seal on the transmission is caused by a failure of the output support bearing on that side of the tranny... If it just started you can replace the output support race and bearing. if it has been doing this for some time... Then the lack of support will quickly destroy the 3rd gear clutch and fill the tranny with metal... You will begin to notice a lag or a churgle as it shifts into 4th at highway speeds... Once this happens the tranny is toast... GM reman trannys are a couple grand... used ones can be had for about $500... expect to pay $500-1000 for the labour to re&re the unit. Yes, I know of this from first hand experience. These trannys are strong but not indestructible. Easin' down the highway in a new Cadillac, I had a fine fox in front, I had three more in the back ZZTOP, I'm Bad I'm Nationwide Greg Link to comment Share on other sites More sharing options...
BodybyFisher Posted October 20, 2008 Report Share Posted October 20, 2008 Sorry to be the bearer of bad news... BUT a leak out of the drivers side axle seal on the transmission is caused by a failure of the output support bearing on that side of the tranny... If it just started you can replace the output support race and bearing. if it has been doing this for some time... Then the lack of support will quickly destroy the 3rd gear clutch and fill the tranny with metal... You will begin to notice a lag or a churgle as it shifts into 4th at highway speeds... Once this happens the tranny is toast... GM reman trannys are a couple grand... used ones can be had for about $500... expect to pay $500-1000 for the labour to re&re the unit. Yes, I know of this from first hand experience. These trannys are strong but not indestructible. Greg, I thought the same thing when I first read this, Logan had the same problem on the passenger side. But this member said this "I noticed that the transxale seal does not appear to be leaking", so I am not sure if he has the same problem. He mentioned that he had a leak at the rear of the pan. Pre-1995 - DTC codes OBD1 >> 1996 and newer - DTC codes OBD2 >> https://www.obd-codes.com/trouble_codes/gm/obd_codes.htm How to check for codes Caddyinfo How To Technical Archive >> http://www.caddyinfo.com/wordpress/cadillac-how-to-faq/ Cadillac History & Specifications Year by Year http://www.motorera.com/cadillac/index.htm Link to comment Share on other sites More sharing options...
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