Axle Codes (LS=Limited Slip / Traction Lok):

F-150:

19 – 3.55 Non-LS
18 – 3.08 Non-LS
H9 – 3.55 LS
B6 – 3.73 LS
OK LOOK IN YOUR DOOR JAM AND SEE WHAT AXLE CODE YOU HAVE AND LET ME KNOW? I WOULD THINK THIS WOULD WORK FOR ALL YEARS BUT I MAY BE WRONG.

 

my door jam says 17. i have found that it is 3:31 gear raito...doesnt seem like anyone else has it. hope that helps someone

 

My dads truck says 17 in the door for the axle, you are saying if it has a number for the first digit then it is a non-limited slip axle, but my dad ordered it spicific back in 1995 with a limited slip axle and I have seen the limited slip in action on the truck. Could 17 be a special number for a limited slip axle with 3:31 gears? Also If i was to throw that rear end into a 4X4 truck, does the front axle gear ratio have to match the back one?

 

My 94 4x4, also says axle code 17, does anyone know what it 17 is?

Thanks

 

Yes

 

Mine is 18 its the 30.8 rear gear one wheel wonder action. I am hoping to find a donor truck with a ls 3.55s front and rear to swap out next summer

 

Google is such a wonderful tool.... I just typed in Ford Truck Axle Code 17 and this is the first or second result it shows: http://www.ford-trucks.com/article/i...de_Chart_.html

But if you don't want to go to that site:

Code: 17 Ratio: 3.31:1 Type: Regular(Non-Limited Slip or Open Differential, whichever you prefer to call it)

It also lists that code 17 was used in the 70's for 3.25:1 open differential

 

that is how i figured mine out i used Google also what transfer case i got and front end although the front end has a big 44 in the rear

 

I dunno what year that works until, but it should be mid to late 60's-at least 97 any letter in the code is LS.

I don't think 3.25's are used in anything anymore, but I could be wrong. Seems like a tractor gear to me. So the codes won't work universally.

H5 is 4.10 LS. I believe 15 is 4.10 open.

 

H9, heck yeah!