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Motorcraft MERCON automatic transmission fluid is used in the transfer case
Motorcraft MERCON automatic transmission fluid in the transfer case according to the 2002 Ford Ranger Owner Guide
The 2002 GMC Sierra-2500HD has a 5-speed manual.
It uses ATF+4
The 2002 GMC Sierra-2500HD runs on regular unleaded.
The 2002 GMC Sierra-1500 runs on regular unleaded.
axles ue 75w90 t-case uses ATF
I belive the transmission will take sincromesh fluid found and any gm dealer and your transfer case will take dexatron III fluid.
ATF+4, about 2 quarts
It will use R134a Freon..........
The Owner Guide shows Motorcraft Mercon automatic transmission fluid
check metal tag on transfer. for info.