it depends if it is an automatic or standard the automatic has a dip stick under the hood and a standard has a plug on the drivers side of the transmission.
In the transmission. You add fluid the same place you check the fluid level. Buy a transmission funnel to make it easy.In the transmission. You add fluid the same place you check the fluid level. Buy a transmission funnel to make it easy.
The same place you check the fluid level.
You add fluid at the same place you check the fluid level. Takes a special funnel. If there is no place to check the level, then it is a sealed for life transmission.
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.
Same place you check the fluid level.
Same place you check the fluid level.
Same place you check the fluid level.
Same place you check the fluid level.
You add fluid at the same place you check the level.
You add fluid the same place you check the fluid level.
Same place you check the fluid level. If there is no place to check it, then it is a sealed transmission, which needs no service. At least that is the idea.
The same place you check the level.