waterzap Posted March 13, 2013 Report Share Posted March 13, 2013 I have already had my transmission pan dropped, filter replaced. But not sure how much of the fluid came out. So I thought of an idea. Install a T Fitting in the front transmission cooler line. The one that runs in the bumper. Enough space there, and easy to get to. Then its an easy job to just start the engine, attach another hose to the T, fill the transmission as it is pumping out old fluid. Even if I can just get a few quarts out, if I do it every now and again, say with every other oil change, will keep the transmission fluid fresh. Any problems with that idea? Link to comment Share on other sites More sharing options...
KHE Posted March 14, 2013 Report Share Posted March 14, 2013 Changing the trans. fluid at every other oil change is overkill in my opinion and you won't be able to clean the pan. It is just as easy to disconnect the return line at the radiator and make a hose that threads into the radiator fitting and direct it into a bucket every 100,000 miles or so. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
waterzap Posted March 14, 2013 Author Report Share Posted March 14, 2013 I might just do that. Thanks. Can I just put the car in Park. Run the engine fluid stops pouring out? Any way that would hurt the transmission? Running with less and less fluid? Link to comment Share on other sites More sharing options...
Cadillac Jim Posted March 14, 2013 Report Share Posted March 14, 2013 I would NEVER run the engine with a transmission low on fluid. Also, I would NEVER tow a car with the transmission low on fluid unless it had the drive shaft disconnected (impractical on a FWD) or it was on a trailer or flatbed. Then, some transmissions don't have a rear pump and you can't tow them with the drive wheels on the ground for more than 50 miles or some such even when the fluid is at the full mark; I don't know if the 4T80E is in that category but I would assume that it was unless I got definite information otherwise. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
KHE Posted March 14, 2013 Report Share Posted March 14, 2013 Running the engine to pump out the transmission fluid will not hurt the transmission provided: 1. The transmission is in Park so the clutches/bands are not loaded. 2. Once you see air bubbles in the fluid coming out, turn the engine off immediately. Do not let the engine idle with the trans. fluid is empty. Kevin '93 Fleetwood Brougham '05 Deville '04 Deville 2013 Silverado Z71 Link to comment Share on other sites More sharing options...
Cadillac Jim Posted March 14, 2013 Report Share Posted March 14, 2013 KHE - you are a braver man than I. But I bow to your experience. -- Click Here for CaddyInfo page on "How To" Read Your OBD Codes-- Click Here for my personal page to download my OBD code list as an Excel file, plus other Cadillac data -- See my CaddyInfo car blogs: 2011 CTS-V, 1997 ETC Yes, I was Jims_97_ETC before I changed cars. Link to comment Share on other sites More sharing options...
JimD Posted March 15, 2013 Report Share Posted March 15, 2013 KHE - you are a braver man than I. But I bow to your experience. I have been using that procedure for decades on transmissions from the THM350 to 4T80-E with no ill affects. Following the procedure is important. For me, there is little to be gained by removing the pan for cleaning; whatever material that accumulates in the pan (and on the magnet) will remain there forevermore. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
JimD Posted March 15, 2013 Report Share Posted March 15, 2013 KHE - you are a braver man than I. But I bow to your experience. I have been using that procedure for decades on transmissions from the THM350 to 4T80-E with no ill affects. Following the procedure is important. For me, there is little to be gained by removing the pan for cleaning; whatever material that accumulates in the pan (and on the magnet) will remain there forevermore. Jim Drive your car. Use your cell phone. CHOOSE ONE ! Link to comment Share on other sites More sharing options...
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