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You will need to buy a "TRANSMISSION FILTER KIT," which will include a new transmission filter, uptake gasket, and pan gasket for your transmission. (They run about $20 or less on eBay.) Once you have done that, you will need to hoist the vehicle, and CAREFULLY remove the transmission pan by loosening one bolt a little at a time without removing them, and breaking the old gasket free (hopefully without making too much of a mess of transmission fluid). About half of the transmission fluid (about a gallon and a half) will be in the pan (the rest in the torque converter). It is usually sufficient to replace just the amount of oil in the pan (otherwise you need to remove the torque converter inspection plug on the bell housing and crank the engine to expel the seal, draining the other half of the fluid, then replace the bell housing seal).
Once you have drained away the transmission fluid in the pan, CLEAN THE PAN THOROUGHLY WITH A SHOP TOWEL, and carefully remove the bolts that secure the filter to the transmission valve body. (As I recall it is four 10mm bolts... but not sure on your year model).
Remove the filter, and remove any remnants of gasket on the uptake chamber between the filter and the valve body. MAKE SURE YOU REPLACE THE SMALL GASKET AT THE TOP OF THE FILTER WITH A NEW ONE, OTHERWISE THE TRANSMISSION WILL SLIP DURING THE 1-2 SHIFT DUE TO AIR BEING SUCKED-IN (been there).
Check for correct torque specifications for the filter mounting bolts before tightening them and DO NOT OVER-TIGHTEN THE RETAINING BOLTS.
Once you have replaced the filter, and your pan is clean, scrape away all remnants of gasket material from the mounting surfaces, and position the new filter. (This is easier if you use a tiny amount of silicone RTV to hold the gasket in place and keep it aligned with the pan mounting holes).
Replace the pan, tighten the bolts to spec, re-fill the transmission with the appropriate amount of NEW ATF, then test.
Very easy BUT messy to replace.. A filter and gasket kit is less than $20. Just remove all of the bolts on the transmission pan with a drain pan underneath... Replace the filter inside. Clean the pan and transmission surfaces and install with the new gasket. Do not use gasket sealer unless instructed to... Then re-fill with recommended fluid. Check fluid level with engine running.
What is the year/make/model of car/truck in question? Typically it's the same for all cars. 1. Place a large enough drain pan under the transmission. 2. Remove the bolts from the transmission pan in a star pattern leaving a few loose ones at each corner to prevent the pan from dropping. 3. Tap the pan on the side lightly with a rubber mallet to to pop it loose from the hardened gasket. 4. Remove the remaining pan bolts. 5. Remove the one bolt holding the transmission filter in place. 6. Pull the filter off and replace the filter making sure to seat the filter stem back into the transmission; and replace the filter bolt. 7. Clean the pan out with brake parts cleaner, the gasket surface on the transmission, and the pan. 8. Replace the gasket on the pan, and re-install the pan tightening in a star pattern. Use a torque wrench and tighten the bolts to the specified amount in the shop manual. (Typically about 12ft lbs which is just a bit more than hand tight.)
Raise the vehicle. Refer to Vehicle Lifting.
Place a drain pan under the transmission oil pan.
Remove the oil pan drain plug.
Remove the oil pan bolts.
Remove the oil pan.
Remove the gasket.
Remove the magnet.
Remove the oil filter.
Remove the filter neck seal.
The transmission oil pan gasket is reusable. Inspect the gasket and replace as needed.
Clean the transmission case and the oil pan gasket surfaces with solvent.
Install the filter neck seal.
Install the oil filter.
Install the oil pan gasket to the pan.
Install the magnet into the bottom of the pan.
Notice: Refer to Fastener Notice in Service Precautions.
Install the oil pan to the transmission with seventeen bolts.
Tighten the oil pan bolts to 11 Nm (97 inch lbs.) .
Apply a small amount of sealant GM P/N 12346004 to the treads of the drain plug.
Install the oil pan drain plug.
Tighten the oil pan drain plug to 18 Nm (13 ft. lbs.) .
Install Dextron Automatic Transmission Fluid.
Lower the vehicle.
Although this is may not work depending on transmission wear and tear, you will need to do this if you plan to replace transmission any way. Replace the damaged hose. Next I would get a transmission filter kit. This is a simple kit that is sold at part stores and includes filter and gasket. You will need to buy transmission fluid and a gasket sealant. Jack up the vehicle, drain the transmission fluid by loosening the transmission pan, if you need help finding this check the gasket shape you purchased. The pan will most likely be stuck a little from the previous gasket sealant. Carefully pry it apart with a flat head screwdriver or pry bar, transmission fluid will go when pan is dropped, so, be careful in placement of pan and how much you loosen all bolts. when pan is dropped check for metal shavings inside. If you have none things are looking good. Remove filter most oftenly attached with phillips head screws. Check this filter for debris and metal. If you do not spot anything serious by now, replace using new filter. Ensure you have a clean surface for the new gasket after removal of old gasket. Once you have this done, add a thin layer of sealant to pan and place gasket on top of it. Apply another thin layer of sealant to the other side of gasket and reinstall to transmission using correct tightening sequence and torque. These bolts do not need to be overly tight. Most leaks happen from overtightening bolts to pan. Usually a lil over hand tight is fine, but, check with you parts store. Add fluids to proper level and then you will be able to test the transmission out. I know it sounds like alot, but, it cheaper than buying a new transmission if you don't have to.
There is a gasket supplied when you buy the transmission filter for all transmissions that your vehicle would have came with. You don't want to be using that stuff on a transmission pan, as a replacement for a gasket. I would wonder if the filter was changed?
If it's readily accessible, you can but it's also a good idea to replace the filter while you're there. A new filter, fluid, and gasket should keep the transmission trouble free for at least 30K miles.