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.
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.
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.
I really hope help ypou woth this (remember rated this help) Good luck.
SOURCE: transfer case fluid?
Under the truck at the rear of the transfer case there is a plug, pull it out, you should be able to touch the fluid with your little finger, that will be a level that is just below the fill hole
SOURCE: fluid in a transfer case
no do not put atf in the transfer case chevy has a product for this it is found in the owners manual or jo in to gm and ask for fluid for a 03 chevy 2500 transfer case
SOURCE: need to know fluid capacity of differential
Dont remember specific amounts for those but they are "fill till it comes out of fill hole" On flat level ground. About three gallons should do it with some leftover. Check with your parts house or dealer to make sure of what goes into the transfer case...many now use dextron III not gear lube.
Any excessive metal flakes in old lube indicates a problem with internal parts wear for either diffs or case. (everything wears so there is always some, it just shouldn't look like glitter paint)
There should be tow approx 1" nuts on the back of the case lower one is drain, upper to fill. Diff cover needs to be removed to drain. Fill through plug on cover.
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SOURCE: type and capacity of fluids
The kind of fluid needed is called GLS this is not something you can get at some grease and go. To my knowledge this particular fluid is still a dealer only item. DO NOT put ATF in your transfer case. I don't remember the capacity but the dealership would have this information.
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