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Re: 1993 Ford F-350 4x4
Look on the passenger side up about 6 inches from the bottom of the rearend.. it takes either a big allen wrench or a 3/8 socket..take that plug out and stick a piece of wire down in there or your little finger to test where level is . thanks jerry holler if you have more
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Raise the vehicle and properly support it. Remove the wheel and drum. Remove the rear diff cover, have a drain pan underneath to catch the gear oil. Place the trans in nuetral, chalk the front wheels to keep vehicle from moving if you forget to put it back into park befor you lower the vehicle. Rotat the differential until you see the bolt that holds the diff pin in place. Remove the bolt, 5/16 or 8 mm I believe. You can then remove the diff pin, do not rotate the diff with the diff pin removed! Push the axle in, you can then remove the C-clip that holds the axle to the side gear, it will usuall drop or just fall out. Pull the axle out of the rear diff and replace the seal.
Put everything back together. Use black or grey RTV to reseal the diff cover making sure o clean up both surfaces as best you can. Put trans in park. Lower the vehicle. Remove the fill plug from the side of the differential and fill with gear lube until lube comes out the hole. Reinstall the plug and your good to go.
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There is a fill plug on the front side of the differential. Look close, it's a flush type pipe plug, probably with a square recess about the size of a 3/8 socket hole. Usually rusty or covered in grime. Remove this plug and fill until lube runs out. It should be located about half way up from the bottom of the diff. housing.
To check the fluid there wil be a plug on the side of the Reese diff housing. Use w 3/8" ratchet to remove the plug. The fluid should be level with the button of the hole.
To change the fluid first remove the fill/check plug as described above. You always want to make sure that plug comes out first so you know you can fill the diff after your done. Then place a drip pan under the read diff and remove all the bolts that hold the diff cover top the diff housing, roughly 10-12 bolts. Then carefully pry the pan away from the housing. Let the gear lube drain while you cean the gasket meterial from both the cover and the differential housing.
You can either get a new gasket or you can use a good RTV type gasket maker. I prefer the higher end GREY products myself. Lay a pencil size bead around the differential. Reinstall the cover tightening the bolts to just barely snug. The RTV should just start to push out from behind the cover. Let it sit for about a half an hour and then do the final tightening.
I am almost 100% positive that the rear diff talks regular 80/90 weight gear lube. Your local parts store will be able to conffirm the correct lube and the quantity, approximately 2-4 quarts depending on what size ring gear you have.
There is usually a plug on the rear axle differential that you remove (hex wrench) You add lube with grease gun flexible tube .Fill to the bottom of the hole (until you can feel the lube beneath the inside of t;he rim of the hole
The noise usually is the clutches in the posi unit not releasing properly when turning, I've had sucess by taking the diff.cover off and cleaning as much old fluid out as possible. Install cover and add two bottles of Ford posi additive and fill with 75/140 synthetic gear lube. It holds about 3.3 litres. Drive vehicle to a parking lot with enough room to do figure eights. At low speed make fairly tight turns in a figure eight. Do this several times, then reverse your direction and repeat. This forces new lube into the clutch packs. Drive vehicle and listen for improvement,
totally clean out your rear end,taking back cover off and spray with cleaner and air hose. reinstall with new gasket glue and add new oil, but put in 2 bottles of anti slip differential oil, then top with gear oil. make several figure 8 's til rear end fully distributes oil thru out rear end. if rear end is dirty you may have to repeat this action after5000 km. diff slip oil can be purchased at dealer
I Am a Mechanic I have mainly worked on diesel for the last 12 years I have a 2004 F-150 FX4 EXT CAB TOW PACKAGE 5,4 4X4 WITH 9.75 rear end. I had the same problem I drained my rear end and put motorcraft and the limited slip addative I got from the ford dealer here in town. SAME PROBLEM. I drained the rear end again. put in amsoil and 2 "I said 2BOTTLES OF LIMITED SLIP ADDITIVE." that was almost 1 yrs ago I havnt had any problems since and I spend about 3/4 of the time pulling a trailer.