Transmission pan removal

5.2 liter V8 engine?

Remove the four front skid-plate bolts holding the front skid plate, using a ratchet and socket. Remove the skid plate.

Pull the plastic splash shield away from the vehicle, loosening the retaining clips. Remove the splash shield.

Place an oil drain container under the oil pan. Loosen the drain fitting with a wrench until oil drains from the pan. When oil is done draining, tighten the drain fitting.

Disconnect the electrical connections running to the starter motor. Remove the starter motor mounting bolts with a ratchet and socket, then remove the starter motor.

Remove the oxygen sensor socket from the exhaust pipe, using a wrench.

Remove the exhaust manifold bolts where the exhaust meets the manifold on both sides, using a ratchet and socket

Place an jack under the transmission to support it. Remove the pressure on the transmission crossmember.

Remove the bolts that hold the transmission crossmember in place, using a ratchet and socket. Then remove the crossmember. Place a jack stand under the transmission to keep the transmission from falling off the jack if hit. Once removed, the exhaust will hang down, allowing enough room to remove the oil pan.

Disconnect the oil level sensor and the nut retaining the transmission cooling lines, using a wrench.

Remove the oil pan bolts with a ratchet and socket, then remove the oil pan and gasket.

Clean the mounting surfaces of the new oil pan and engine block. Make sure what ever you use to clean the surfaces dosn't gouge the metal.

Place a coat of RTV (gasket) sealer on the engine block where the pan will meet the rear main cap.

Place the new gasket on the pan and push the new oil pan into place. Finger tighten the oil pan mounting bolts to hold it in place. Tighten the bolts with a torque wrench to 18 ft-lbs. DO NOT OVER TIGHTEN THE BOLTS! Doing so will cause the gasket to deform and create leaks!

Connect the oil level sensor and the nut retaining the transmission cooling lines, using a wrench.

Place the exhaust back into position and replace the transmission crossmember bolts and crossmember with a ratchet and socket.

Remove the jack supporting the transmission.

Connect the exhaust back to both sides of the manifold, tightening the bolts with a torque wrench to 20 ft-lbs.

Attach the oxygen sensor socket to the exhaust pipe with a wrench.

Replace the starter motor by installing the starter motor mounting bolts with a ratchet and socket. Connect the electrical connections to the starter motor that were disconnected during removal.

Push the retaining clips on the plastic splash shield into the appropriate retaining clip holes.

Replace the front skid plate by replacing the four front skid plate bolts with a ratchet and socket.

Fill the engine with 5 quarts of oil. Make sure to check the level on the dipstick to find the exact level when filling.

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.

Hi,
The follwoing is from the GM Shop Technical Manual.
Changing the filter requires removing the transaxle oil pan and gasket,
Remove or disconnect

• Raise vehicle and suitably support.
• Loosen oil pan bolts and drain fluid,
• Remove oil pan attaching bolts.
• Remove pan pan and gasket.
• Remove the oiil filter using a long screwdriver pry filter neck out of the seal.
• Check oil filter seal for damage or wear. If needed, remove and replace

Install or connect

• install new oil filter and/or seal.
• install the old pan gasket since it can be reused, unless sealing ribs are damaged. If damaged, use new gasket.
• Install the oil pan and attaching bolts.
• Tighten pan bolts to 13 lb. ft,
• Lower vehicle.
• Refill transxle to proper level with DEXRON III or DEXRON-IIE fluid.
• Checkoil pan gasket for leaks,

Check your tranmission fluid level, if its low it can cause your transmission to shift slower, if its drastically low your transmission will slip in and out of gears or free rev (act like its in neutral) under acceleration or when shifting to a higher gear. If your fluid level is good, then you need to change your transmission filter. If your not mechanically inclined, take your vehicle to a shop and have them replace your filter for you, any repairs or maitnance envolving your transmission can easily go bad and potentially destroy your transmission if you do something wrong.

1. Buy new filter & transmission pan gasket

2. Raise vehicle, block tires, and use jackstands (never rely on any type of jack to hold the vehicle up.) and get a container or drain pan to catch the old transmission fluid.

3. Put drain pan or container under your transmission pan, start loosinging the bolts that hold the pan to the transmission. If you loosen the bolts alittle at a time you should be able to minimize spilling fluid everwhere and be able to catch it in your drain pan easier. (if your transmission has a drain plug remove it before loosening the pan bolts, this is not very common though and if you have a drain plug your lucky) once the majority of the fluid has drained from loosening the plugs, continue to loosen bolts so you drop the pan easily cause its gonna be full of fluid (unless you have the drain plug, if you do the pan should be virtually empty and you can remove it fully without alot of mess).

4. Locate the bolts that hold your filter to the transmission, be sure to only remove the bolts that hold the filter. Use the new filter for a visual aid so you can be 100% sure your only removing the filter. (The filter is bolted to a metal cover plate that houses the transmission clutch assemblies, spring valve assemblies, and floating shutter pins and they all operate under hydraulic pressure). Once the bolts are out of the old filter you should be able to slide the goose neck of the filter out of the filter port (again use the new filter for a visual aid) The goose neck should have a rubber o-ring type seal (or equivilent) make sure its on the old filter when you pull it, If its not then gently feel in the port and make sure the seal isnt sticking inside the port.


****** If you were to remove the cover plate thinking it was the filter, the hydraulic slide valves would move and you could seriously damage your transmission turning a $30.00 problem into a 1500.00 problem. I speak from experiance, so please use the new filter for a visual, I can't stress it enough*

5. Clean the pan's gasket area maticuliously, removing all of the old gasket, do the same to the transmission. Prep the pan side of your new gasket (I like using permatex gasket sealer) and install it to your transmission pad. (you can do this before you clean the transmission's gasket area so the permatex has time to adhear to the pan while you clean the gasket area on the transmission)

6. Using transmission fluid lube up the new filter's o-ring and slide it into the filter port. line up the bolt holes and start puting the filter bolts back in, tightening them evenly much like you would do to lug nuts if you had to change a tire.

7. Now get your pan and prep the other side of the pan gasket (gasket should be well tacky and sticking to the pan at this point) once the gasket is prep'd line the pan up with the transmission and begin installing the pan bolts tighten them the same way you did the filter bolts,

**Note**FWD** Depending on your vehicle's make/model, you may have to drop one of the control arms to remove the pan.

**Note**RWD** Depending on your vehicle's make/model, you may have to remove the cross member to remove the pan -or- drop the drive shaft, remove the bell housing bolts (bolts through transmission into engine block) remove the starter, and flywheel cover remove the bolts that connect your torq converter to your flywheel and slide the transmission back from the motor far enough so the transmission pan is no longer under the cross member.

GOOD LUCK I HOPE MY POST HELPS YOU!

2wd Models

1. Disconnect the negative battery cable. Drain the engine oil.
   
2. Remove the oil dipstick.
   
3. If necessary remove the exhaust pipe crossover.
   
4. If equipped with automatic transmission, remove the converter housing pan and the transmission oil cooler line retainer from the bracket.
   
5. On 1996-98 models, remove the oil filter and if equipped, the oil filter adapter.
   
6. If necessary, remove the starter brace and bolt and swing the starter aside.
   
7. Remove the strut rods, if equipped.
   
8. Remove the oil pan and discard the gaskets.
   

To install:

1. Apply a suitable sealant such as GM part number 12346192 or its equivalent to the front cover-to-block joint and to the rear crankshaft seal-to-block joint. Apply the sealant about 1 inch (25mm) in both directions from each of the four corners.
   
2. Clean all gasket surfaces and use new gaskets to assemble.
   
3. Install new gasket and seals.
   
4. Install the oil pan.
   
5. On 1988-95 models, tighten the pan bolts to 100 inch lbs. (11 Nm). Tighten the pan nuts to 17 ft. lbs. (23 Nm).
   
6. On 1996-98 models, tighten the oil pan nuts and bolts to 18 ft. lbs. (25 Nm).
   
7. Install the strut rods, if equipped.
   
8. If removed, install starter, starter brace and bolt.
   
9. If equipped, install the oil filter adapter.
   
10. If removed, install the oil filter.
    
11. If equipped with automatic transmission, install the converter housing pan and the transmission oil cooler line retainer to the bracket.
    
12. Install the exhaust pipe crossover.
    
13. Install the oil dipstick.
    
14. Fill the engine with oil and check for leaks.
    

Fluid & Filter Change Under normal service (moderate highway driving excluding excessive hot or cold conditions), the manufacturer feels that automatic transmission fluid should not need periodic changing. However, if a major service is performed to the transmission, if transmission fluid becomes burnt or discolored through severe usage or if the vehicle is subjected to constant stop-and-go driving in hot weather, trailer towing, long periods of highway use at high speeds, fluid should be changed to prevent transmission damage. A preventive maintenance change is therefore recommended for most vehicles at least every 90,000 miles (145,000 km).
Although not a required service, transmission fluid changing can help assure a trouble-free transmission. Likewise, changing the transmission filter at this time is also added insurance.

1. Raise the car and support it securely on jackstands.
   

The torque converters on some transmissions are equipped with drain plugs. Because it may take some time to drain the fluid from the converter, you may wish to follow that procedure at this time, then come back to the pan and filter removal.


Before removing the transmission fluid pan, insure that the area is clean of dirt and debris

2. Place a large drain pan under the transmission.


Loosen all of the pan attaching bolts to within a few turns of complete removal

1. Loosen all of the pan attaching bolts to within a few turns of complete removal, then carefully break the gasket seal allowing most of the fluid to drain over the edge of the pan.
   

CAUTION DO NOT force the pan while breaking the gasket seal. DO NOT allow the pan flange to become bent or otherwise damaged.

1. When fluid has drained to the level of the pan flange, remove the pan bolts and carefully lower the pan doing your best to drain the rest of the fluid into the drain pan.

Once the pan is removed, discard the old gasket and insure that the mating surfaces are clean


Inspect this magnet inside of the pan for any large pieces of debris. A light gray coating is normal


Clean the pan thoroughly with a safe solvent and allow it to air dry

5. Clean the transmission oil pan thoroughly using a safe solvent, then allow it to air dry. DO NOT use a cloth to dry the pan which might leave behind bits of lint. Discard the old pan gasket.


The transmission filter is secured by a mounting bolt (arrow). Some models may use two bolts


Remove the filter mounting bolt ...



... then pull the filter free from the transmission

6. If necessary, remove the Automatic Transmission Fluid (ATF) filter mounting bolts, then remove the filter by pulling it down and off of the valve body. Make sure any gaskets or seals are removed with the old filter. The transmission usually has one round seal and a rectangular gasket.

7. Install the new oil filter screen making sure all gaskets or seals are in place, then secure using the retaining screws, if applicable.


Install a new pan gasket


8. Place a new gasket on the fluid pan, then install the pan to the transmission. Tighten the attaching bolts to 71-119 inch lbs. (8-13 Nm).


Fill the transmission with the proper amount of ATF

9. Add three quarts (six quarts if the torque converter was drained) of fluid to the transmission through the filler tube.
10. Remove the jackstands and carefully lower the vehicle.
11. Start the engine and move the gear selector through all gears in the shift pattern. Allow the engine to reach normal operating temperature.
12. Check the transmission fluid level. Add fluid, as necessary, to obtain the correct level.

transmission pan must be removed to drain fluid & change filter.loosen all pan bolts,remove all but 4 bolts @ corners.strike pan with a plastic hammer or block of wood if it's stuck. slowly remove remaining bolts,allowing fluid to drain into a suitable container.this can get messy,have rags handy.when drained,remove pan,clean pan & transmission gasket surfaces.pull filter straight down,push new filter on to tube,positioned as original,install new gasket,'run down 'all pan bolts then tighten them securely.

Changing the oil pan gasket on a GMC Yukon XL is realtively simple, but does require removal of the exhaust pipe. You will need a new oil pan gasket and a new exhaust pipe flange gasket.
Put the car on ramps or jacks to access the undercarriage.
Remove the exhaust pipe by removing the 3 nuts holding the exhaust pipe flange to the exhaust manifold. These nuts often rust and prior application of penetrating oil may be required to remove them without damage. Once the pipe is unbolted, work the exhaust system loose from the hanging brackets. In most cases the entire system does not have to be removed since there is enough room to remove the pan with only the front hangers removed.
Drain the oil from the engine
Remove the 10 mm bolts holding the pan to the block.
Remove the old gasket material and scrape any remaining gasket from the block and pan.
Install the new gasket. Forma-Gasket or a similar product may be used in small quantities to "glue" the new gasket in place and prevent shifting while the pan is reattached to the block.
Reinsall the 10 mm bolts in a cross pattern to ensure the gasket is compressed evenly. Do not overtighten the bolts.
Replace the pipe to flange gasket between the exhaust pipe and the exhaust manifold with a new part.
Reattach the exhuast pipe to the hangers.
Install the 3 bolts connecting the pipe flange to the exhaust manifold.
Fill the engine with oil.

Fluid - A/T: Service and Repair
Transmission Fluid and Oil Filter Changing
REMOVAL PROCEDURE
1. Raise and suitably support the vehicle. Refer to Vehicle Lift Points.
2. Place drain pan under pan
3. Remove oil pan bolts from front and sides only.
4. Loosen the rear oil pan bolts approximately four turns.
5. Lightly tap the oil pan with a rubber mallet or pry to drain the fluid from main case.
6. Remove the oil pan bolts from rear oil pan and gasket.
7. Remove front oil pan bolts leaving one corner bolt in loosely.
8. Lightly tap oil pan with rubber mallet or pry to drain fluid.
9. Remove the following remaining components:
^ The front oil pan bolts
^ The oil pan
^ The gasket
10. Remove the oil filter bolts and filter.
11. Clean the following components:
^ The transmission case
^ The front adapter case
^ The oil pan gasket surfaces with solvent
^ Air dry
^ All traces of gasket material must be removed
INSTALLATION PROCEDURE
1. Install the gasket.
2. Install the oil filter.
3. Install the bolts.
^ Tighten the transmission oil filter bolts to 20 Nm (15 ft. lbs.).
NOTICE: Refer to Fastener Notice in Service Precautions.
4. Install the front oil pan.
5. Install the front oil pan gasket
6. Install the front oil pan bolts
^ Tighten the front oil pan bolts to 11 Nm (96 inch lbs.).
7. Install the following components:
^ Install the pan
^ Install the gasket
^ Install the bolts
^ Tighten the oil pan bolts to 11 Nm (96 inch lbs.).
8. Refill the transmission with DEXRON III through oil pan fill plug on the side of the (main case) oil pan. Fill the transmission to lower edge of oil
pan fill. Fill plug opening using and oil suction gun.
^ Tighten the oil pan fill plug to 45 Nm (33 ft. lbs.).
9. Lower the vehicle.
10. Check the transmission fluid level. Refer to Transmission Fluid Checking Procedure.

4.0L Engine To Remove:

1. Disconnect negative battery cable.
2. Lift the vehicle.
3. Drain the engine oil.
4. Remove or disconnect the following:
   • Exhaust pipe from exhaust manifold.
   • Exhaust hanger at the catalytic converter and lower the pipe.
   • Starter motor.
   • Flywheel/torque converter housing access cover.
   • Oil level sensor (if equipped).
5. Place a pole jack under vibration dampener with a piece of wood between dampener and jack.
6. Remove or disconnect the following:
   • Engine mount through bolts and raise engine for clearance to remove pan.
   • Transmission cooler lines (if equipped).
   • Oxygen sensor harness from oil pan mounting studs.
   • Oil pan bolts and studs.
   • Oil pan and gasket.

To Install:

1. Clean the gasket mating surfaces.
2. Apply Mopar® Silicone Adhesive Sealant or equivalent onto the cylinder block in four location as shown.

1. Attach the pan gasket to the oil pan with Hi-tack or equivalent (2003-2005 vheicles).
2. Use 1 ½ x ¼ inch bolts to fabricate alignment dowels. Cut off the head of the bolts and cut a slot into the top of the dowels (2006 vehicles).

1. Install two dowels into the timing case cover (2006 vehicles).
2. Install two dowels into the cylinder block (2006 vehicles).
3. Place the gasket over the dowels and onto the cylinder block and timing case cover (2006 vehicles).
4. Position the oil pan.
5. Install the 1/4 inch oil pan bolts. Tighten to 84 in-lb (9.5 Nm).
6. Install the 5/16 inch oil pan bolts. Tighten to 132 in-lb (15 Nm).
7. Remove the dowels.
8. Install the remaining 1/4 inch oil pan bolts. Tighten to 84 in-lb (9.5 Nm) (2006 vehicles).
9. Lower the engine onto the engine mounts.
10. Install the through bolts and tighten the nuts.
11. Remove jack stand and remove the piece of wood.
12. Install the flywheel and torque converter access cover.
13. Install starter motor.
14. Connect the exhaust pipe to the hanger and to exhaust manifold.
15. Install the transmission oil cooling lines (if equipped).
16. Install the oxygen sensor wiring supports to the oil pan mounting studs.
17. Install the drain plug into the oil pan. Tighten to 25 ft-lb (34 Nm).
18. Lower the vehicle.
19. Connect negative battery cable.
20. Fill the oil pan with oil. WARNING
    Use extreme caution when the engine is operating. Do not stand in a direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing.
    
21. Start the engine and inspect for leaks.