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Your 1996 GMC Sierra truck might not go in reverse because the transmission fluid is empty. You might also have damaged the transmission or the transmission linkage could be broken.
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It is either on the back left in the engine department. Or you have a full plug on the transmission and its full when it spills overs.
You add fluid the same place you check the fluid level. If you have a newer GMC the transmission may be a sealed unit with no place the check the level or add fluid.
If its an automatic half ton its the 4l60E if its a one ton its the 4l80E
the transmission in a 1996 2x4 sierra is called a 4L60E. It is a 4 speed automatic with electronic overdrive.
DextronDextron
I belive the transmission will take sincromesh fluid found and any gm dealer and your transfer case will take dexatron III fluid.
i had to use 7 quarts
My 1986 GMC High Sierra 1500 stock transmission is a 700R4. My 1986 GMC High Sierra 1500 stock transmission is a 700R4. it could also be a th 400
If its a 305, toward the rear left of the air filter cover
You can locate the transmission fluid in your 2004 GMC Envoy by using the transmission fluid dipstick. The transmission fluid will be in the transmission fluid pan.