How do i check for fluid levels?

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.

There should be a plug in the bottom, and on the side of the transfer case. Remove the plug and stick your finger in the hole. The fluid should be just below the hole. If not, then it is low. You add fluid into the same hole.

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.

check the transfer case fluid level and fill it up your fluid for the tcase is transmission fluid, IIRC its ATF +3, to add fluid is pretty simple. On the rear of the case there are two fairly good sized bolts, the top is where you check your fluid level and add fluid, the bottom is to drain the case. Remove the top bolt fill until level with the bottom of the hole. in other words fill it until it runs out the hole and replace the bolt. hope this helps

check the transfer case fluid level and fill it up your fluid for the tcase is transmission fluid, IIRC its ATF +3, to add fluid is pretty simple. On the rear of the case there are two fairly good sized bolts, the top is where you check your fluid level and add fluid, the bottom is to drain the case. Remove the top bolt fill until level with the bottom of the hole. in other words fill it until it runs out the hole and replace the bolt. hope this helps I no it sounds simple but if its not this then its thisdealer part ($40) and it's located on top the transfercase between the front and rear doors.(Driver's side) replace the switch it also may be causeing it heres three things its in one of theses

First I would check your fluid level. There are 2 plugs located on the rear of the transfer case. Remove the top one and verify fluid level. To repair the leak the transfer case will need to be removed and reinstalled with a new gasket.

Verify fluid level first, add if needed and verify that sound goes away. If sound fails to go away you will need to have the transfer case replaced or rebuilt. I think the fluid is Dextron III ATF. Double check with another source before adding fluid.

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.

You add it right to the transfer case. on the transmission

Check the fluid level in there. If it was low for an extended period, change fluid. Whining is often caused by low fluid level, but is also a symptom of internal wear. If fluid change does not help, it needs to be rebuilt or replaced.

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