Rear diff fluid type
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Freshman User
Joined: Oct 2014
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Rear diff fluid type
Hey guys, gals. Been awhile since I could visit here. Just picked up a 2001 F350 7.3 6 speed dually 4x4. Hoping it's going to reliable enough to be the new tow rig around the farm. Have a few issues to work out first.
First order of business: after the drive home the rear diff was puking oil through the speed sensor. Turned out the vent was plugged. Now I'm quite low on oil.
How can I determine which rear I have and if it's limited slip or not? Any codes, markings on the housing, vin id?
Thanks
First order of business: after the drive home the rear diff was puking oil through the speed sensor. Turned out the vent was plugged. Now I'm quite low on oil.
How can I determine which rear I have and if it's limited slip or not? Any codes, markings on the housing, vin id?
Thanks
Lead Driver
Joined: Dec 2006
Posts: 7,092
Likes: 145
From: San Diego, CA
I'm not sure how to decode the axle but you have a Dana 80.
Here's a link to decoding your VIN and door sticker: Super Duty Identification Codes
Spot #9 on your door tag will tell you what gears you have and if it is limited slip.
IIRC it's the same 75W140 gear oil that is used in the Sterling 10.5.
If you have a LS and don't use a gear oil with friction modifier already in it, I would only add modifier if the rear end chatters. Then I would add 1 oz. at a time until the chatter stops. Too much modifier will defeat the LS.
Just my .02
Here's a link to decoding your VIN and door sticker: Super Duty Identification Codes
Spot #9 on your door tag will tell you what gears you have and if it is limited slip.
IIRC it's the same 75W140 gear oil that is used in the Sterling 10.5.
If you have a LS and don't use a gear oil with friction modifier already in it, I would only add modifier if the rear end chatters. Then I would add 1 oz. at a time until the chatter stops. Too much modifier will defeat the LS.
Just my .02
Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
Last resort is to jack up the rear end, put the transmission in neutral, and spin a rear tire (set). If the other rear wheel set spins the same direction, it's an LS differential. If it spins the opposite, it's an open differential. While you're at it, if you count the ratio of driveshaft rotations to wheel rotations, you'll also know the axle ratio.
Laughing Gas
Joined: Oct 2017
Posts: 922
Likes: 7
The L is for limited slip.
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