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The differential fluid on a Dodge Ram 1500 4x4 needs to be changed every 50,000 miles for normal highway driving. If the vehicle is used in 4x4 regularly, then change the differential fluid about every 25,000 to 30,000 miles.
for the 1997 4x4 4 door gmc yukon, GM uses the 6lug on 5.5in
The front differential is an "open" differential. No limited slip components there.
All Ford Rangers have a rear differential , and if they are 4X4 equipped , a front differential also
Unless you have a 4x4 or 6x6 unit, there is no front differential.
The front differential uses 80w90.
200
Once you get to the seal it is an easy repair. Problem is you must remove the drive shaft, 4x4 differential, and transmission to get to the seal. Not an easy repair.
Dana 35
It is a rubber plug in the front cover.
The axels connect the differential to the wheel.
You can use any SAE certified rear differential fluid in your 1970 Chevrolet. The 1970 Chevrolet differential fluid can be checked from the differential fluid check port.