Q: How to remove and replace an extension housing oil seal that is causing oil leaks?
A: To remove an extension housing oil seal, raise the vehicle and support it on jackstands. The seal is located at the rear of the transmission where the driveshaft is attached, and if it is leaking, transmission lubricant will be built up on the front of the driveshaft and may be dripping from the rear of the transmission.
Q: How to remove and replace an output shaft seal on Chevrolet Avalanche,Silverado,Suburban,Tahoe,GMC Sierra,Yukon,Yukon Denali and Yukon XL?
A: To remove and replace a transfer case seal on a vehicle, first raise the vehicle and support it securely on jackstands. Remove the skid plate and, depending on which seal you're replacing, remove either the front or rear driveshaft. To remove the seal, pry it out with a screwdriver or seal removal tool, being careful not to damage the seal bore.