Have been noting oil on driveway. When I climbed under, it is apparent that both front alxe seals are leaking. Oddly enough, had to replace the rear pinion diff seal on my 03 Sierra last week. W/r to the 05 Yukon (title is wrong, it is an 05), are these axle seals difficult to change out, and could you let me know if it is easier to drop the front diff, or change in place. I would rather not have to drop the diff.
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Re: 2005 Yukon Front Diff Axle seals
You don't have to remove the whole diff to change the seals, but you will have to seperate it where the shaft meets the carrier housing. There is a clip holding the passenger axle shaft in place that you have to remove to change the seal. The drivers side axle stub can be removed with a little force as there is a spring clip holding that side in.
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The end of the drive axle that goes into the diff is in splined into the side gear of the diff and will be dry as there would be no way to stop the oil coming out of the diff past the splines. The diff seal runs on the outside of the side gear and seals the oil in the diff. The drive axle slides in and out of the splined section to compensate for the changing lengths of the axle on turns. Grease on the splines would be a big help as it would allow the splines to move when under drive load.. Check the hub bearings for condition and adjustment and check the hub itself for wear indicators.
THE DRIVE SHAFT HAS TO BE REMOVE TO REPLACE THE PINION SEAL.DONT MATTER IF SEAL NOT LEAKING BUT SEAL NEED TO BE REPLACED TO KEEP OUT WATER DIRT OUT OF THE TRANSFER CASE TO KEEP FROM DAMAGING THE PINION BEARING.
TRANSMISSION LEAKS COME FROM TRANSMISSION OIL PAN GASKET LEAKING.OIL COOLERS LINES LEAKING.LEAKING AT TORQUE CONVERTER FRONT SEAL.TRANSMISSION SPEED SENSOR SEAL LEAKING.FRONT AXLE SEALS LEAKING AND LEAKING AT TRANSMISSION COOLING LINES TO RADIATOR.CHECK ALL YOU WILL FIND LEAK.IF YOU HAVE FAST LEAK OR PRESSURE LEAK.WITH CAR RUNNING IN PARK EMERGENCY BRAKE APPLIED LOOK UNDER CAR IF YOU SEE FLUID LEAKING OUT IN LARGE QUANITIES.COOLER LINES LEAKING OR TORQUE CONVERTER FRONT SEAL LEAKING.IF YOU HAVE SLOW LEAK THE LEAKS HAS TO BE AXLES SEALS OR PAN GASKET LEAKING OR VSS SENSOR SEAL LEAKING.
If the front differential is covered with oil, chances are that the leak is from the pinion seal on the diff itself or from an engine leak. check all the fluids and find what is low and clean off all the residue there so you can find the source. Since the t case is behind the diff, and the air flow is towards the rear (unless you drive backwards all day long) any leaks would tend to blow towards the back, not towards the front.Once you find the actual leak source, someone here can help advise you on how the repair can be made.
drivers side under the motor or out by the axel
if under the motor is it a frint wheel drive auto if so the seal ware the axle goes in is bad if is not a front wheel auto check the power steering box to see if the oil is leaking from there if so replace the box
all these parts can be gotten at autozone
you need to pull off wheels,brakes, rotor /unit hub bearing, both axles and intermediate shaft, as well as the vac disconnec ton the front axle tube. if only the right side leaks then only then only pull the right axle and intermediate shaft and vac disco. it is a trick with a miller tool to replace the seal. the left side seal is inside the diff and the carrier has to come out to replace it. pete
To replace the seal you must pull out the carrier assembly and the pinion gear and install a new crush sleeve if you do it by the book, I have found that if the yoke is removed a new seal installed and the yoke tightened to about 50 foot lbs of torque it is ok, as far as the lube goes there is a plug on the cast case of the diff, it will either be a square drive plug or a large allen plug, fill the diff so you can just touch the fluid with your little finger, don't overfill or the axle seals will start leaking.