Maintenance
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Freshman User
Joined: Jan 2018
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Maintenance
What type, brand, non-synthetic, synthetic, weight, viscosity, or additives need for differential oil change. I don't drive any more
than 5k a year. Truck is 92 f150 2whd. As far as I know it's never been done, this truck has been in the family for 20yrs, and has 200k on the odometer. I'm changing transmission fluid and filter. U-joints carrier bearing, saw bar bushings, and rear shocks. Since I'm under there I might as well do the differential.
than 5k a year. Truck is 92 f150 2whd. As far as I know it's never been done, this truck has been in the family for 20yrs, and has 200k on the odometer. I'm changing transmission fluid and filter. U-joints carrier bearing, saw bar bushings, and rear shocks. Since I'm under there I might as well do the differential.
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
80W90, Gear Oil, any kind.
I don't believe you need any Friction Modifier for your model.
Check your Owners Manual.
Rear cover screw torque 25-35 Ft Lb
Filler Plug 15-30 Ft Lb
if you use gasket sealer, use Gear Oil Sealant
https://shop.advanceautoparts.com/p/...1182/7740016-P
I don't believe you need any Friction Modifier for your model.
Check your Owners Manual.
Rear cover screw torque 25-35 Ft Lb
Filler Plug 15-30 Ft Lb
if you use gasket sealer, use Gear Oil Sealant
https://shop.advanceautoparts.com/p/...1182/7740016-P
Fleet Mechanic
Joined: Aug 2015
Posts: 1,835
Likes: 364
From: Candy Mountain
Ford revised the lube recommendation for the Ford 8.8 (which is what you should have) to 75w140, and it is what I use. That said if you don't tow anything heavy or engage in any other heavy use 80w90 is probably fine.
You can't go wrong with Ford or Motorcraft lubricant, which will probably be a synthetic blend. I am using Lucas, but asking people about lube brands is like bringing up politics. I don't remember the exact quantity spec'ed out by the manual but when I did mine I needed most of three quarts.
If you have a clutch type limited slip (factory limited slip in this era Ford will be clutch type) you will need a bottle of friction modifier. You can determine what was in the truck from the factory from the door jam sticker and/or the differential tag. A standard differential does not require modifier.
If you have a clutch type limited slip then it may be a good time to replace the clutches.
I highly recommend that you replace the axle vent and hose. You can get the parts from Ford still, and they are inexpensive parts. If the axle vent clogs you pressure builds up and you end up with blown out pinion and axle seals.
You can't go wrong with Ford or Motorcraft lubricant, which will probably be a synthetic blend. I am using Lucas, but asking people about lube brands is like bringing up politics. I don't remember the exact quantity spec'ed out by the manual but when I did mine I needed most of three quarts.
If you have a clutch type limited slip (factory limited slip in this era Ford will be clutch type) you will need a bottle of friction modifier. You can determine what was in the truck from the factory from the door jam sticker and/or the differential tag. A standard differential does not require modifier.
If you have a clutch type limited slip then it may be a good time to replace the clutches.
I highly recommend that you replace the axle vent and hose. You can get the parts from Ford still, and they are inexpensive parts. If the axle vent clogs you pressure builds up and you end up with blown out pinion and axle seals.
Cargo Master
Joined: Jun 2013
Posts: 3,182
Likes: 15
From: Somewhere n North America
Do you live in the flat lands of Colorado, or the mountains ?
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