Do I have a limited slip differential? - Ford Powerstroke Diesel Forum
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post #1 of 12 Old 09-22-2010, 05:44 PM Thread Starter
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Do I have a limited slip differential?

Are there any vin codes or tags that would tell me if I have a limited slip differential? I could just go out and pour the coals to her but she has some miles and don't want to tear anything up. She's a late 99 f250 7.3 2WD

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Cory

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99 F250 Super Duty Crew Cab 7.3 Powerstroke

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post #2 of 12 Old 09-22-2010, 05:54 PM
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Yea there is a tag on the right side of the diff. On the first line there are some numbers . mine says , 4.10 F81A AUG . On the second line are some other numbers and finally 2 letters ....... LS . This means it is a limited slip .

That being said mine is a Dana 80 , yours is probably a Sterling with a 10.5 ring gear .

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Last edited by Bad Night; 09-22-2010 at 06:07 PM. Reason: forgot to put the gear size
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post #3 of 12 Old 09-22-2010, 05:56 PM
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on the tag on the rear end , it give gear ratio like 3.73 if you have a limited slip, it says 3 L 73


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post #4 of 12 Old 09-22-2010, 06:09 PM
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Originally Posted by SCUFFY828 View Post
on the tag on the rear end , it give gear ratio like 3.73 if you have a limited slip, it says 3 L 73

Hey Scuffy is that how the sterlings let you know ?

07 F-250 Outlaw , Rough Country 6 inch lift , 37-13.5 R20 Nitto Mud Grapplers , MBRP 5" Exhaust , 08 Mirrors , S&B intake , 5% Tint sides and back , 35% windshield .


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post #5 of 12 Old 09-22-2010, 06:10 PM
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Hey Scuffy is that how the sterlings let you know ?
yep


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post #6 of 12 Old 09-22-2010, 06:14 PM
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Cool , wasn't sure on those .

07 F-250 Outlaw , Rough Country 6 inch lift , 37-13.5 R20 Nitto Mud Grapplers , MBRP 5" Exhaust , 08 Mirrors , S&B intake , 5% Tint sides and back , 35% windshield .


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post #7 of 12 Old 09-22-2010, 06:27 PM Thread Starter
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Sweet, thanks guys I'll check it in the morning!!

Thanks again!!

Cory
99 F250 Super Duty Crew Cab 7.3 Powerstroke

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post #8 of 12 Old 09-22-2010, 07:06 PM
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Easier way... Check the white tag on the driver's door jam. It'll probably say C1, which is 3.73 LS, although I just ran out to the garage to double check my truck, and it doesn't list anything on that sticker.

It might have it on the axle tag, but sometimes whoever serviced the diff last doesn't put the tags back on.

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post #9 of 12 Old 09-22-2010, 07:18 PM Thread Starter
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Everyone is right. Door jamb says c1 and tag says 3 L 73. I guess it's safe to say I have a 3.73 limited slip thanks everyone

Cory
99 F250 Super Duty Crew Cab 7.3 Powerstroke

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post #10 of 12 Old 09-24-2010, 01:02 PM
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Does it work to jack up both back wheels and spin one by hand, if the other wheel turns the other way=open diff, if they both spin the same way=limited slip?
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