Yes the transfer case should be serviced every 40,000 miles.
2001 suburban, services
My 01 Burb has about 98k and I was thinking about having the trans serviced (no power flushing, just filter, gasket and fluid change), brake fluid flushed and coolant service. I haven't looked at the owner's manual yet, but does the transfer case get servied too?
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If you have electronic transfer case than it takes AutoTrak ll fluid GM part # 12378508. Its only avaible from a GM dealer. Its about $8.00qt. Takes a little over two qts. so you'll need three.
I would change them both. I use Mobil 1 synthetic gear lube I get fom AutoZone. I also get my Mobil 1 synthetic transmission fluid from them. Get my Mobil 1 engine oil from Walmart.
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