Bought my GS several years ago and changed all the fluids... The trans pan I changed numerous (read 5-6) times and it continued to leak. Becoming absolutely fristrated I took it to a local garage and they changed it, still leaks! The shop owner is an old GM mechanic, says he checked that the pan is flat, checked where the trans dipstick goes in, checked the vent. I just went out in the garage and it's been covered since Nov and I have a river of trans fluid! Any thoughts, tips or suggestions? o No: Thanks...
Are you certain that it's leaking at the pan rail? Maybe the cooler lines, any of the seals, or a cracked case could be the problem.
Once it leaked after the shop did it, he was all over it. Pressure washed the underside to see where it was coming from. Just pulled it out of the garage and gave her a quick bath. Going back in...
Mine had the same issues. Leaks always show at the pan as it's the lowest point. It was not leaking at the pan but appeared to be. Dropped it off at local trans. shop for a day. They changed all the external seals while doing a filter fluid change. Hasn't leaked since. Shift lever, speedo cable, kickdown cable etc., 4-5 in total. Total with fluid/filter/seals was +/- $200 or close.
Unfortunately, classic cars of all makes with automatics will tend to leak after setting all winter. Those gaskets shrink and out comes the fluid. In MOST cases, after driving them the gaskets swell back up and the leaks diminish, if not stop completely. But then I have a C-4 that refuses to stop leaking no matter how many times the tranny shop does whatever does to make it stop. In other words, I don't have the answer either, just the problem!
Autos have a tendancy to leak from the spedo cable. There is an external o-ring on the bullet holding the gear, and a interal seal that seals the gear and the bullet. This will produce a leak from the cable. The second most likely place for a leak is the pan. Remove the pan and clean thouroughly. With the bottom down and one edge on the workbench, use a small ball-peen hammer on each bolt hole. After being over-tightened many times the metal de-forms upward, not allowing for enough gasket crush to make a nice seal. Don't overdo it. All you are looking for is to make the hole have a nice concave shape, when looking down on the pan from the seal side. Remember, do not use any type of sealant on the pan gasket! One thing I did forget to mention, this is for cork gasket pans. They will have two ribs between each of the bolt holes. The hard gasket pans will have a rib all the way around the pan, including the bolt holes. The other two most likely places for a trans to leak would be the front seal, this will produce a leak from inside the dust cover, or the kick down cable located in the front passenger side of the transmission. Not very common for the kickdown to leak, but I have seen it happen. Give everything a good wipe down, drive it for a while and take a close look. Don
Had the same problem, Dropped the pan, Changed the filter, Gasket and refilled with fluid. Hav'ent had a proble since. "Knock on wood"
Truth be told time!! My garage admitted using silicone, both sides of the gasket, to stop the leak and were reluctant to pull it off. Well, pull it off they did yesterday and the pan was bent. Straightenend and reinstalled... My garage floor is dry for the first time in years!!
as a full time tech ive had very good experience w the gaskets that come in the napa trans filter kits they arent cork but some kind of rubbery combo they dont leak like cork or require retightening like cork but sounds like they did it right the 2nd time around
I know you have to jack the engine up to get to the oil pan. What about the trans pan? There's several bolts that are underneath the crossmember that look hard to get to.
Back from the garage and there is still a small leak... Garage said the pan was bent so they straightened it. I'm going to get after it myself again, this leak is driving me nuts. Did/do you use any sealer with the Napa gasket?
Had similar problem. After a drive, and sitting for a few days, it would leak. My problem, accumulator piston seal.
Just crawled under... Wiped everything down as there looked to be a little puddle under the "clutch accumulator cover". Same part?
I may have found the problem... Should you be able to turn the accumulator cover while it's on the trans???
Thanks for all the comments. It was the o-ring on the accumulator cover. After 11 years I don't have to be Moses and part the Red Sea on my garage floor!
Glad that fixed it. Yeah took me months to find that one. Sometimes it's the seal, other times the spring gets weak and needs replaced.
