Diff service
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Cross-Country
Joined: Oct 2004
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Diff service
I was thinking of changing the diff fluid in my 99 4x4. I don't want to get too deep so I was thinking of just sucking it out through the fill hole. Will this work and then what kind of fluid do I put back? My ranger does have the limited slip. Is the front diff the same?
Laughing Gas
Joined: Jul 2002
Posts: 769
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From: Moneta, VA
You can take out the filler plug and suck the fluid out.
It's not that hard to pull the cover off the rear differential. I think you can do it, just seal it back up with some RTV silicone.
I don't have any experince with the front differentials, but you should be able to suck the fluid out through the fill plug opening.
You will need to pick up "Friction Modifier" from the parts store or Ford. I think some types of gear lube they sell now come with the Friction Modifier already in the mix.
You'll want to get 80W-90.
It's not that hard to pull the cover off the rear differential. I think you can do it, just seal it back up with some RTV silicone.
I don't have any experince with the front differentials, but you should be able to suck the fluid out through the fill plug opening.
You will need to pick up "Friction Modifier" from the parts store or Ford. I think some types of gear lube they sell now come with the Friction Modifier already in the mix.
You'll want to get 80W-90.
Laughing Gas
Joined: Jul 2002
Posts: 769
Likes: 12
From: Moneta, VA
Originally Posted by Revolution
i got a 99 mazda b4000 4x4 and was wondering what kind of diff fluid id need for the rear diff and what geariing is in it and how do i empty it and how do i do the front diff?
thanks
thanks
Again, you'll need the 80W-90. If your axle is a limited slip, you'll need the friction modifier to add to the 80W-90. See chart below, look on the sticker in the drivers door jamb under Axle for the code.
(Thanks to RPS for the chart)
Last edited by Tiggie; Sep 25, 2006 at 10:26 PM.
Laughing Gas
Joined: Jul 2002
Posts: 769
Likes: 12
From: Moneta, VA
Axle code 96 would indicate your truck has an 8.8 (standard for 4.0's) rear axle, with 3.73 gears and no limited slip.
3.73 Gears are a good all around gear for the person who wants some acceleration and towing, yet still retaining decent highway mileage.
4.10 gears are great for towing, but not so good for the interstate commute. With 3.73 gears, the driveshaft turns 3.73 times for every one full rotation of the wheel. With 4.10 gears, the driveshaft turns 4.1 times for every one full rotation of the wheel. Thus, the engine RPM is higher with 4.10's at 65mph than 3.73's at 65mph.
3.73 Gears are a good all around gear for the person who wants some acceleration and towing, yet still retaining decent highway mileage.
4.10 gears are great for towing, but not so good for the interstate commute. With 3.73 gears, the driveshaft turns 3.73 times for every one full rotation of the wheel. With 4.10 gears, the driveshaft turns 4.1 times for every one full rotation of the wheel. Thus, the engine RPM is higher with 4.10's at 65mph than 3.73's at 65mph.
Elder User
Joined: Apr 2006
Posts: 600
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From: Cisco, TX pop: 2500
Originally Posted by Tiggie
Axle code 96 would indicate your truck has an 8.8 (standard for 4.0's) rear axle, with 3.73 gears and no limited slip.
3.73 Gears are a good all around gear for the person who wants some acceleration and towing, yet still retaining decent highway mileage.
4.10 gears are great for towing, but not so good for the interstate commute. With 3.73 gears, the driveshaft turns 3.73 times for every one full rotation of the wheel. With 4.10 gears, the driveshaft turns 4.1 times for every one full rotation of the wheel. Thus, the engine RPM is higher with 4.10's at 65mph than 3.73's at 65mph.
3.73 Gears are a good all around gear for the person who wants some acceleration and towing, yet still retaining decent highway mileage.
4.10 gears are great for towing, but not so good for the interstate commute. With 3.73 gears, the driveshaft turns 3.73 times for every one full rotation of the wheel. With 4.10 gears, the driveshaft turns 4.1 times for every one full rotation of the wheel. Thus, the engine RPM is higher with 4.10's at 65mph than 3.73's at 65mph.
...luckily the 5th gear is a little higher to compensate. But not that much higher...
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From: Denver
Originally Posted by Revolution
so how could i make it limited slip, would it be worth while going to 4.10 gear?
The Ford l/s diffs all specify synthetic fluid, which I believe is 75W140, rather then the 80W90, and do require friction modifiers. The front diffs are all open. If I was changing the fluid, I'd suck it out the plug so I didn't have to mess with sealing up the cover again, but that's just me.
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Oct 5, 2003 09:00 AM