There is a drain plug on some vehicles at the bottom side of the differential that must be removed to drain the old oil out but on others you must remove the cover which has at least ten bolts that are in a circle pattern around the differential cover. After removing the cover and draining the old oil out dry out the excess oil left inside the casing with a clean rag, scrape off any old gasket material on both the differential casing and the cover. Purchase a gasket for the cover and reinstall the cover tightening the bolts in a criss cross or X pattern not too tight . Proceed to locate the filler plug on the upper right or left side of the differential, this plug is usually removed with the square end of a 3/8" socket wrench just using the square end of the socket wrench should do it or you may need a large hex head allen wrench but usually using a short extention with the socket wrench to get the clearance to turn the square end of the extention or socket wrench inside the plug will work, some times the plug is very tight and you may need to use a 1/2' drive socket wrench with a 1/2" to 3/8" reducer or adapter to acheive the neccessary torque required to crack the filler plug free, now get a coulple of 80/90 weight gear oil quarts and cut the filler tip back a bit with a razor or utility knife and using a 3/8" length of rubber hose slide it over the end of the tip tighten a small hose clamp on to the hose to prevent it from sliding off the filler tip, then feed the end of the hose into the filler hole on the differential and invert and sqeeze the container of oil to force the oil into the differential until it fills and over flows out the filler hole, screw in the filler plug and tighten. Use this general procedure for both the front and back differentials.
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There is a drain plus on your dif housing. un screw it let it drain. and then refill with new fluids from the top filler hole.
SOURCE: 2003 rear differential
I am a Ford tech and the diff doesn't need to be serviced (new lube) unless it is torn down or it has a leak, however it is my opinion that under heavy usage such as towing it should be serviced at around 60,000.
SOURCE: The rear differential makes a
if you have more than 75,000 miles than yes the fluid change will help.
also check for signs of differential fluid leaks. it may need a new gasket. the gasket should be replaced anytime you change the fluid.
SOURCE: how do I drain front differential
bottom front plug of gearbox,middle plug is gearbox plug dont take that out
SOURCE: 2004 Ford F-150, my rear differential seems to be
start with a fluid change.its the cheapest. chk the fluid as it comes out for metal flakes. you may have sticky parts. drain , fill with diesel and turn tires by hand, let sit for half hour and turn the tires again.do this three or four times then drain and replace fluid and modifier.
SOURCE: Differential fluid
hi i bought today u can use 75w90 or80w90 i bought80w90 because i m in canada and temp.below -18
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