I have looked on the door stickers and tried to find a way to decode the VIN number. Am I gonna have to crawl under the truck to find out what it ratio it is? And how do I know if it is limited slip or not? Thanks

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'99 XLT S/C 4.6 Auto White, A.R.E. Hard tonneau, ventvisors and bug guard all painted to match, Kenwood 6 Disc, Westin nerfs, Buccaneers front license plate!

 

Tell us your axle code from the door sticker, and we'll tell you what ratio you have.

However, I bet you have either a
(H9) 3.55 limited slip
(19) 3.55 non-limited slip



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MarkS
1999 F-150 XLT 4x4 ORP SC SB
5.4, 3.73, & Superchip.

 

I have the H9 3.55 limited slip, that is the better one right? the one that is harder to get stuck or whatever. If I am wrong please explain it to me.

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'99 XLT S/C 4.6 Auto White, A.R.E. Hard tonneau, ventvisors and bug guard all painted to match, Kenwood 6 Disc, Westin nerfs, Buccaneers front license plate!

 

Yes it is better.

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1999 Ford F150 XLT 4x2, Cloth Seats, Amazon green, 16" All season tires, Soft Tonneau Cover, CD Player, 4.6 liter Triton V8, 3:55 ls, towing package, 4 speed auto, K&N Airfilter
Future Mods:
1)Superchip
2)Airbox Mod
3)Flowmaster Exhaust

Fast46Triton

The Terminator!

 

You can look on your differential housing cover bolt tag. It should have 3 sets of numbers. Two in a row and the third underneath. Example: Mine has 3L55, which is a 3.55:1 with limited slip. If you do not have the L, then you do not have limited slip. the other numbers are the gear ratio.

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stock 98 XL, Reg. cab,4.6, Auto, Tow package, 255/70R16 on styled steel wheels,3.55LS, Black with chrome grille and bumpers! MODS: custom stereo by me, building speaker box was a !@#$%.

 

Step one: Reach out and pinch the rear end. If it hurts its your rear end and not someboy elses.

Step two: Grasp each cheak with each hand. If your hands are full you have the big rear end If not, you have the small rear end. If you like it you have the limited slip rear end!

 

Is the 19 a posi-trac or just a one wheel spinner.
I have the 3.55 ls but my g'pa's code said 19. Just wondering.

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Big F150 XLT, extended cab, towing package, 4.6L V8, 3.55 LS,Lund deflector, Permenant Air Filter. Lot's of mods to come.

 

Hey,

So if I have an I8 code this means I have a 98 non-limited slip axle?

TIA

Mark

 

JGG,
You are the owner of a 3.55 NON limited-slip if your axle code is 19. that meens you have a one-wheel spinner.

Mark G,
If you have the axle code 18, then you have a 3.08 NON limited-slip axle.

May the wind always be at your back,

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MarkS
1999 F-150 XLT, 4x4, ORP, SC, SB, 5.4 Liter, 3.73ls, Husky Truck Box, Westin Chrome Nerf Bars, TOFF Spray-in Bedliner, FORD Blue-Oval Hitch Cover, & Superchip.



[This message has been edited by MarkS (edited 09-03-1999).]

 

Thank You Sir.
Mark