When I did this at firestone the most common intervals were 30,60,90k, etc...
AnswerYour best best is to check out your owner manual for any type of service schedule, but if you can't find it go to driverside.com and enter in your make/model/year. They have a service schedule that's pretty good, and you can also record what you do so you have a good history report for when you want to sell your car down the road.30,000
Rear differential service is necessary to ensure that the lubricating fluid in the differential does not break down. Replacing the fluid can help prevent ware on the gears.
A rear differential service drains the rear differential housing and replaces it with new oil to help the gears turn more smoothly. You usually see them between the two axles going to the left and right of the rear wheels. The differential is what allows the tires to slow down or speed up separately so that one does not drag.
The differential, often referred to as the "rear", is the gear housing which transmits the rotation of the driveshaft to the rear wheels. A four-wheel drive truck also has a differential for the front wheels.
Repair Rear Differential Parts
Only off a cliff; if your differential siezes your rear end falls off a millisecond later.
When you see rear differential fluid on your rear brakes & assembly.
Differential, with 10.25 ring gear Rear..........7.4 pints Differential, with 8.8 or 9 ring gear Rear..........5.5 pints Differential, Dana 70 HD Rear..........7.4 pints Differential, Dana 60, 61 Rear..........5.9 pints Differential, Dana 70 EX HD Rear..........6.5 pints Differential, Dana 80 Rear..........8.4 pints This link should help if you Identify which you have if you don't already know. http://www.drivetrain.com/rearend.html Hope This Helps.
All Ford Rangers have a rear differential , and if they are 4X4 equipped , a front differential also
Depends on which differential you have but in most cases 4 to 5 pints should fill it.
Valvoline recomends 15,000-30,000 depending on how hard the vehicle is used...I do mine about every 30,000
Generally every 30000 miles unless you have synthetic fluid, and the transfer case as well.