What type of transmission is in a 99 gmc Yukon 4wd?
The 1999 GMC Yukon 4WD could have either a 4L60E (4-speed automatic) or a 4L80E (4-speed automatic) transmission, depending on the engine and options selected. The 4L80E was generally used in models with larger engines or heavier towing packages. To know for sure, you'll need to check your vehicle's specifications (often found on a sticker inside the driver's side door jamb) or consult your owner's manual.