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Old 07-23-2009, 02:00 PM   #1
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Default H9 Axle Code

My I.D. label on the driver's door indicates an axle code of H9 for my truck. Couple of questions....

1. What size does this mean I have, or can you tell me where I can look to find out?
2. Does this code mean I have the trak-lock axle?

Thanks for the help....am planning to change out the differential fluid and wanted to know this before I proceed. Additionally, when I buy differential fluid....I know I have to buy synthetic. Is the XL-3 modifier neccessary, or do certain brands / types of fluid suffice without adding the modifier?

Thanks!!
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Old 07-23-2009, 02:09 PM   #2
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I'm pretty sure the H9=3.55ls. Since you have the limited slip rearend than yes the friction modifier is necessary.
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Old 07-23-2009, 02:20 PM   #3
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Quote:
Originally Posted by dloudy View Post
My I.D. label on the driver's door indicates an axle code of H9 for my truck. Couple of questions....

1. What size does this mean I have, or can you tell me where I can look to find out?
2. Does this code mean I have the trak-lock axle?

Thanks for the help....am planning to change out the differential fluid and wanted to know this before I proceed. Additionally, when I buy differential fluid....I know I have to buy synthetic. Is the XL-3 modifier neccessary, or do certain brands / types of fluid suffice without adding the modifier?

Thanks!!
H9 means you have a 3.55LS. Limited slip is the same as Traction lok, so yes you will need XL3 additive. I don't know if other brands of oil already contain an equivalent. For type of oil, check out page 293 in your owners manual.

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http://www.ford-trucks.com/forums/86...ier-in-it.html

Last edited by Keeblerz28; 07-23-2009 at 02:40 PM.
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Old 07-23-2009, 02:34 PM   #4
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Thanks guys.

I counted 12 bolts in it, so that would be equal to a 9.75", right?

Do you know of a substitute for the XL-3, instead of buying Motorcraft? Would a Redline or Amzoil synthetic require it's use as well?

Thanks again...!!
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Old 07-23-2009, 02:38 PM   #5
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i had a jeep rubicon with lockers/limited slip rear that required either dino oil plus additive or if using synthetic it didnt require the additive. I would speak with a ford tech about this. im 99% sure you dont need the additive with synthetic. i guess it probly couldnt hurt the syn oil but its worth asking not to waste money
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Old 07-23-2009, 02:49 PM   #6
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Quote:
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i had a jeep rubicon with lockers/limited slip rear that required either dino oil plus additive or if using synthetic it didnt require the additive. I would speak with a ford tech about this. im 99% sure you dont need the additive with synthetic. i guess it probly couldnt hurt the syn oil but its worth asking not to waste money
The owners manual specifies [motorcraft] synthetic oil + friction modifier if LS. Other brands sometimes include the modifiers already.
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Old 07-23-2009, 05:21 PM   #7
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ford racing modifyer is better then motorcraft.
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Old 08-02-2009, 09:19 PM   #8
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So more than likely, my truck would have the 9.75 inch rear end?
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Old 08-03-2009, 12:34 AM   #9
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Quote:
Originally Posted by dloudy View Post
Thanks guys.

I counted 12 bolts in it, so that would be equal to a 9.75", right?

Do you know of a substitute for the XL-3, instead of buying Motorcraft? Would a Redline or Amzoil synthetic require it's use as well?

Thanks again...!!
if you use amsoil or redline you shouldnt need friction modifier "unless you experience chatter" but 99 percent dont.
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