Help ID Rear Diff Tag for Fluids
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More Turbo
Joined: Dec 2015
Posts: 500
Likes: 38
From: Pacific Northwest
Help ID Rear Diff Tag for Fluids
Need some help identifying my rear diff for changing out fluids.
On a 2003 F-250 4x4 4 door, long Bed.
Rear Diff tag says
V 414 F
S 10 5 5618
Also a anyone have any recommendations for a nothing fancy, good priced rear cover replacement?
Thanks in advance!!
On a 2003 F-250 4x4 4 door, long Bed.
Rear Diff tag says
V 414 F
S 10 5 5618
Also a anyone have any recommendations for a nothing fancy, good priced rear cover replacement?
Thanks in advance!!
Elder User
Joined: Mar 2007
Posts: 695
Likes: 4
There are two tags on these rear ends. One is the one you gave us (kind of) and there is also a fluid tag that should tell you the diff needs 75w140 synthetic fluid.
On the other tag, there should be a code that gives you the axle ratio as well as if it is a limited slip. For example, if it were a 3.73 ratio with a limited slip, the tag would read 3 L 73. Look at the tag you have again to confirm.
If it has a limited slip, you will also have to add friction modifier. Even if the fluid you use says it has it in it, I would add a little more as the fluids tend to be light on the modifier.
As for a cover, look for an aluminum finned cover off a 2008. You will need longer bolts to make it work but the cover can be had off ebay for around $50.
On the other tag, there should be a code that gives you the axle ratio as well as if it is a limited slip. For example, if it were a 3.73 ratio with a limited slip, the tag would read 3 L 73. Look at the tag you have again to confirm.
If it has a limited slip, you will also have to add friction modifier. Even if the fluid you use says it has it in it, I would add a little more as the fluids tend to be light on the modifier.
As for a cover, look for an aluminum finned cover off a 2008. You will need longer bolts to make it work but the cover can be had off ebay for around $50.
Laughing Gas
Joined: Jan 2007
Posts: 870
Likes: 9
From: Carbondale, CO
Hope this helps with the cover and procedure. I used this cover and the Mobile with no additional friction modifier on my 02.
https://www.ford-trucks.com/forums/8...with-pics.html
https://www.ford-trucks.com/forums/8...with-pics.html
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More Turbo
Joined: Dec 2015
Posts: 500
Likes: 38
From: Pacific Northwest
Awesome thank you guys for the help!
I did see that other tag and it says W 140 synthetic only.
So 75-140.
I also found that my door tag has axle code 31, I'm pretty sure is a Dana rear end.
So for a cover is their more than one Dana model for a cover?
Edit: It's a Dana 10.5 after seeing 10 5 on my diff tag.
Off to eBay to purchase a cover!
I did see that other tag and it says W 140 synthetic only.
So 75-140.
I also found that my door tag has axle code 31, I'm pretty sure is a Dana rear end.
So for a cover is their more than one Dana model for a cover?
Edit: It's a Dana 10.5 after seeing 10 5 on my diff tag.
Off to eBay to purchase a cover!
Elder User
Joined: Mar 2007
Posts: 695
Likes: 4
Awesome thank you guys for the help!
I did see that other tag and it says W 140 synthetic only.
So 75-140.
I also found that my door tag has axle code 31, I'm pretty sure is a Dana rear end.
So for a cover is their more than one Dana model for a cover?
Edit: It's a Dana 10.5 after seeing 10 5 on my diff tag.
Off to eBay to purchase a cover!
I did see that other tag and it says W 140 synthetic only.
So 75-140.
I also found that my door tag has axle code 31, I'm pretty sure is a Dana rear end.
So for a cover is their more than one Dana model for a cover?
Edit: It's a Dana 10.5 after seeing 10 5 on my diff tag.
Off to eBay to purchase a cover!
Usually SRW F-350's are the ones with Sterling 10.5 rears and the f-250's get a Sterling 10.25 rear.
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More Turbo
Joined: Dec 2015
Posts: 500
Likes: 38
From: Pacific Northwest
Gonna go check my local Napa tomorrow for a cheaper synthetic alternative. I don't even think mobile 1 would be that much. Granted O'Reillys isn't the best place to buy fluids.
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More Turbo
Joined: Dec 2015
Posts: 500
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From: Pacific Northwest
I'm not saying your wrong at all, how did you come to that conclusion? Are you saying the door sticker axle code 31 is always for the front axle? Thanks
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From: Stephensville WI
Help ID Rear Diff Tag for Fluids
Your rear axle is a Sterling 10.5, not a 10.25. The front is a Dana 60.
Are you sure your code isn't 37 or 3L?
AXLE CODES:
37- 3.73
3L- 3.73 LS
41- 4.10
4N- 4.10 LS
43- 4.30
4L- 4.30 LS
48- 4.88
8L- 4.88 LS
53- 5.38
5L- 5.38 LS
Are you sure your code isn't 37 or 3L?
AXLE CODES:
37- 3.73
3L- 3.73 LS
41- 4.10
4N- 4.10 LS
43- 4.30
4L- 4.30 LS
48- 4.88
8L- 4.88 LS
53- 5.38
5L- 5.38 LS
Senior User
Joined: Jun 2012
Posts: 489
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From: Plant City, FL
Originally Posted by reptar0077
I would but in my "smaller" town O'Reillys auto parts wants 20$ per bottle! That's a lot!
Gonna go check my local Napa tomorrow for a cheaper synthetic alternative. I don't even think mobile 1 would be that much. Granted O'Reillys isn't the best place to buy fluids.
Gonna go check my local Napa tomorrow for a cheaper synthetic alternative. I don't even think mobile 1 would be that much. Granted O'Reillys isn't the best place to buy fluids.
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