Leaking transfer case how to add oil to it and what kind

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Good Day Sir. I recommend to thoroughly check your TC and A/T system of where the oil is really from and if u know how to do it, its kind of hard making the system drop. I guess the parts u need to replace are only the oil seal and gasket.
Hope it help.
God Bless.

1. Be sure to run your car (in 4WD) for about 5-10 minutes or so to warm the oil up and be sure to park on a level ground.First we need to gather our materials. This is what I used for my oil change:Initial expenses

• Oil Catcher - $10 at Pep Boys
• Fluid Pump - $5 at Pep Boys
• 24mm wrench or ratchet (assumed ownership)
• 12mm? and 14mm? sockets to remove skidplate

Transfer Case Change Expenses

• 3 Qt 75W90 Gear Oil - $21
• (I used Redline from myoilshop.com)

2. Locate the Transfer Case.
Remove the Fill Hole plug first, then place your oil catcher in position, and remove the drain hole plug.
While the oil drains, clean off the drain plug.

3. When finished draining, replace the drain plug, and proceed to pump the fluid into the fill hole.
I filled until the fluid overran, but you can check the fluid by sticking a pinky into the hold and checking the level.
Replace the fill hole plug, and done.

the engine and transfer case are to totally different monsters your transfer case controls the four wheel drive if your engine was leaking oil and they replaced some seals most likely they seen grease and oil on the transfer case and assumed it was leaking from the leaking engine that is directly above it even if you dont use the four wheel drive I would still sugest getting that fixed because the axles still turn inside there and you dont want those bearings drying up and going bad

The transfer case is bolted directly to the back of the transmission. Follow the drive shafts, they connect to the transfer case. It is never a bad idea to check fluid levels, however, unless you have a leak, you should not have to add fluid to the transfer case with any kind of regularity.

2.0L Engine

1. Disconnect the negative battery cable.
2. Drain the engine oil.
3. Remove or disconnect the following:
   Engine undercover Front exhaust pipe Lower oil pan bolts and lower pan Cover Upper oil pan bolt and upper pan Baffle plate
   
   Fig. Oil pan and related components-2.0L engine
   
   

To install:

1. Clean all gasket surfaces of the cylinder block and the upper and lower oil pan.
2. Install or connect the following:
   Baffle plate
   
3. Apply a 0.16 in. (4mm) bead of sealant to the gasket surfaces of the upper oil pan.
   Upper oil pan onto the cylinder block within 15 minutes after applying sealant. Tighten the bolts as shown in the accompanying figure.
   
   Fig. Upper oil pan bolt location and torque sequence-2.0L engine
   
   
4. Apply 0.16 in. (4mm) bead of sealant to the gasket surfaces of the lower oil pan.
   Lower oil pan and tighten the bolts, in the sequence shown, to 88-106 inch lbs. (10-12 Nm)
   
   Fig. Lower oil pan bolt tightening sequence-2.0L engine
   Front exhaust pipe Engine undercover Oil drain plug with a new gasket and tighten to 29 ft. lbs. (40 Nm)
   
   Fig. Make sure to the install the new drain plug gasket as shown, or leaks will occur
   
   
5. Lower the vehicle and fill the crankcase to the proper level with clean engine oil.
6. Connect the negative battery cable. Start the engine and check for leaks.

Non-Turbo Engine

1. Disconnect the negative battery cable.
2. Raise and safely support the vehicle.
3. Drain the engine oil into a suitable container.
4. Once the oil has completely drained, install the plug and tighten to 25 ft. lbs. (34 Nm).
5. Remove the front exhaust pipe.
6. Remove the engine oil dipstick and tube assembly.
7. Remove the front plate.
8. Unfasten the oil pan mounting bolts, then remove the oil pan and gasket.
   
   Fig. Exploded view of the oil pan and related components-1999 2.0L non-turbo engine
   

To install:

1. Apply sealant at the point where the engine block meets the oil pump.
2. Use a new gasket and install the oil pan. Tighten the mounting bolts to 8.9 ft. lbs. (12 Nm).
   
3. Install the front plate.
4. Install the front exhaust pipe.
5. Install the dipstick and tube assembly.
6. Safely lower the vehicle to the floor.
7. Refill the crankcase with oil to the proper level.
8. nnect the negative battery cable.
9. Start the engine and check for leaks.

Turbo Engine

1. Disconnect the negative battery cable.
2. Safely raise and support the vehicle.
3. Remove the front exhaust pipe.
4. Remove the exhaust pipe and muffler assembly.
5. Drain the engine oil into a suitable container. Once the oil has drained completely, tighten the plug to 29 ft. lbs. (39 Nm).
6. Remove the dipstick and tube.
7. For AWD vehicles, remove the transfer case assembly as follows:
   1. With the propeller shaft still installed, remove the transfer mounting bolt.
   2. Insert a suitable prytool in between the transfer case and transaxle, then remove the transfer case from the center shaft.
   3. Remove the transfer case from the center shaft. Do NOT tilt the transfer assembly to the rear or oil will leak out.
   4. After removing the transfer assembly, insert tool MB991193 or equivalent, to prevent the oil from leaking out. Use a piece of wire to suspend the transfer case from the body.
      
      
      Fig. View of the transfer case with the tool installed to prevent oil from leaking out-1999 2.0L turbo engines
      
8. Remove the bell housing cover.
9. Disconnect the oil return pipe from the oil pan.
10. Remove the oil pan mounting bolts. Tap the oil pan seal breaker MB998727 or equivalent between the oil pan and the engine block to break the seal and remove the oil pan.
    
    Fig. Exploded view of the oil pan and sealant application-1999 2.0L Turbo engine
    

To install:

1. Clean the sealing surface on the oil pan and engine block. Apply a continuous bead of sealant MD970389 or equivalent to the oil pan.
2. Clean the oil pan mounting bolt holes in the oil seal case.
3. Install the oil pan to the engine block. Tighten the mounting bolts to 5.1 ft. lbs. (6.9 Nm).
4. Use a new gasket and connect the oil return pipe to the oil pan.
5. Install the bell housing cover.
6. If equipped with AWD, install the transfer case assembly.
7. Install the dipstick and tube assembly.
8. Install the front exhaust pipe.
9. Install the exhaust pipe and muffler.
10. Install a new oil filter.
11. Safely lower the vehicle to the floor and add five quarts of oil to the crankcase.
12. Connect the negative battery cable.
13. Start the engine and check for leaks.

Good luck (remember rated this help).

GM Full-Size Trucks 1980-1987 Repair Guide

Transfer Case - FLUID RECOMMENDATIONS
The type of lubricant used in the transfer case varies with model year and type of transfer case. Refer to the list below for the type that applies to your truck.

1980
Conventional transfer cases require SAE 80W or SAE 80W-90 GL-5 gear lubricant.
Full time systems use SAE 10W-30 or 10W-40 engine oil.
1981
Conventional transfer cases require DEXRON®II transmission fluid.
1982-85
All transfer cases require DEXRON®II transmission fluid.
1986-87
All transfer cases except the K30/35 series require DEXRON®II transmission fluid.

For fluid recommendations for the K30/35 transfer cases refer to the owner's manual. LEVEL CHECKS


Fig. Model 208 Transfer Case

Check the four wheel drive transfer case lubricant level every 4 months or 6,000 miles.

1. With the truck parked on a level surface and the parking brake firmly applied, remove the filler plug from the rear of the transfer case (behind the transmission). Be careful not to take out the drain plug at the bottom.
2. If lubricant trickles out, there is enough. If not, carefully insert a finger and check that the level is up to the edge of the hole, EXCEPT in full time four wheel drive cases should be 1 /2 in. below the hole.

Lubricant may be added, if necessary, with a funnel and tube, or a squeeze bulb.



DRAIN AND REFILL
Part Time Systems
No intervals are specified for changing transfer case lubricant, but it is a good idea for trucks that are worked hard or driven in deep water.

1. With the transfer case warmed up, park on a level surface and apply the parking brake.
2. Slide a pan of a least 6 pts. capacity under the case drain plug.
3. Remove the filler plug from the rear of the transfer case (behind the transmission). Remove the drain plug from the bottom.
4. Wipe the area clean and replace the drain plug.
5. Add lubricant with a suction gun or squeeze bulb. Conventional transfer cases require SAE 80W-90 GL-5 Gear Lubricant.
6. When the lubricant level is up to the bottom of the filler hole, replace the plug.

Full Time Four Wheel Drive
The full time system requires oil changes at regular intervals, according to the amount and type of work done by the unit. Trucks used for normal on-off road work should have the transfer case oil changed at 24,000 mile intervals. When used for heavy duty work, trailer towing, snowplowing, and the like, the interval should be halved to 12,000 miles. If the truck is exposed to extremely dusty or muddy conditions, the oil should be changed at 1,000 mile intervals.
The transfer case oil must be hot before changing. Drive the truck until the engine has reached normal operating temperature, and park on a level surface.

1. Slide a pan of at least 8 pts. capacity under the case drain plug.
2. Remove the filler plug.
3. Remove the lowest bolt from the front output shaft rear bearing retainer cover, and allow the lubricant to drain. Be careful; the oil will be hot. There may be a drain plug. If so, remove that instead.
4. Remove the six bolts on the left (driver's) side of the case which secure to P.T.O. (power take-off) cover. Remove this cover and allow the lubricant to drain out.
5. Remove the speedometer driven gear from the upper left rear corner of the case.
6. Use a suction gun to remove as much lubricant as possible from the case cover location and the speedometer gear location.
7. Install the speedometer driven gear, the P.T.O. cover, and the lowest bolt or drain plug.
8. Add approximately seven pints of oil through the filler plug opening. The proper oil to use is 10W-30 or 10W-40 engine oil.
9. Check the fluid level and add sufficient oil to raise the level to 1 /2 in. below the filler plug opening. Replace the plug, and wipe the surfaces of the case and skid plate to remove any excess oil. Drive the truck and check for leaks.

I really hope help ypou woth this (remember rated this help) Good luck.

Use ATF+4

Do not use Dexron or Mercon

your transfer case does not use regular motor oil..it will use gear oil which can be purchased at any local parts store or even wal-mart (most part stores can tell you how much you need to add to the unit but a good rule of thumb is add the gear oil until it starts to drip out the fill/check hole..

just fixed one myself. replace rear output shaft seal on transfer case.