I know it's been covered before guy's, but I can't find the thread. Does anyone know how to determine what the existing gears in our trucks are. I have two tags on mine.One gives the oil spec., the other is a string of numbers that include 08 88 7m12. The only thing I can make of it is it's an 8.8 inch rearend, possibly with 3:08 gears. I would like to go to 4:10 or at least 3:73, but I can't tell where I'm starting from. I hope someone can at least point me in the right direction.
Thanks, Rick

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1998 F-150SC,4.6 liter 5 speed.
S&B air filter+home made air box mod.
2.25 inch true duals w/Dynomax superturbo mufflers.
Superchip!
Pacesetter armor coated headers on the way!

 

My diff tag shows ratio,size,LS?? What does the axle code inside the driver's door say?

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2000 F-150 XL, RC, LB, 5.4L, 4R70W, 3.55LS,
Class III tow, Payload #3, & Convenience pkgs.,
4-wheel disc/ABS, Chestnut/Parchment 40/60,
Ford bedliner w/Paintsaver & gas/wheel/spare locks,
K&N F.I.P.K. w/Outwears pre-filter, Superchip,
Dynomax ultra-flow welded 3" cat-back w/ 3" Y-pipe,
Hellwig front & rear anti-sway bars, Rancho RS 9000s,
Mobil 1, K&N oil filter.

 

Thanks for your time Max. I'm hoping this is what your looking for? /axle/
18
Rick

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1998 F-150SC,4.6 liter 5 speed.
S&B air filter+home made air box mod.
2.25 inch true duals w/Dynomax superturbo mufflers.
Superchip!
Pacesetter armor coated headers

 

You're more than welcome !! That's the one. The 1 means "open" axle; not limited-slip, the "8" means 3.08 ratio, the rear-end size is 8.8" Good Luck, those 3.73s/4.10s will make it seem like 2 different trucks. The door is a code, the tag is specific (open/ratio_size_build date)

[This message has been edited by max mitchell (edited 01-26-2001).]

 

Incredible. I'm impressed with all that you discerned from two little numbers. I really thought most of these trucks rolled off the assembly line with 3:55's, including mine. Well, it looks like a gear change is in store as soon as it warms up a little. Should I look at Ford OEM, or is there a recommended brand name? Thanks again Max,I would not have believed it if you had not literally spelled it out for me.
Rick

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1998 F-150SC,4.6 liter 5 speed.
S&B air filter+home made air box mod.
2.25 inch true duals w/Dynomax superturbo mufflers.
Superchip!
Pacesetter armor coated headers

 

It's no big deal at all; only a common code. Ford Racing Performance Parts makes both ratios for $199 retail, Richmond makes both ratios for $189 www.richmondgear.com (More info= www.reiderracing.com www.ring-pinion.com/ www.4wheelparts.com )If you have any interest in a Limited-Slip rear end, this is also a good time to install one, as the rear has to be tore down to this level for a gear change. The 8.8" has several options that the larger 9.75" does not in LSs.

 

my 2000 f150 4x4 shows 27 on door label what does that stand for. Also do you know place for both front and rear differential gears.
I'm looking at installing 410's and heard the front gears are cut differently
Thank you
Russ

 

rus- 27=open,3:31 Check the links in the above post to buy them. You heard right, the front ones are different.

 

Ok mine says 19 whats my gear ratio???

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98 STX
4.2 V6 5SPD
Clearcoat Black
Mods(So Far)
Superchip
K&N Filter
Bugflector II
Window Ventvisors
Tinted Windows
Pendaliner
Pioneer 12 disk Changer w/wireless remote

 

Black98STX- "1"=open(non-LS),"9"=3.55 ratio

 

Thanks for the info max!

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98 STX
4.2 V6 5SPD
Clearcoat Black
Mods(So Far)
Superchip
K&N Filter
Bugflector II
Window Ventvisors
Tinted Windows
Pendaliner
Pioneer 12 disk Changer w/wireless remote

 

My door code is 19 (open 3:55) could someone inform me of what the folowing numbers mean. I found them on the diff tag.
S808D
55 8 8 7H03
thanks

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1987 F-150 300 L6 4sp 2wd
K&N, flowmasters

 

bigtan- I would suspect that the "55" was missing a "3"; being "3.55", the 8_8 = 8.8" rear end, and the last series being a build date.

 

thanks max, some one told me that my truck probly had 2:75's. Glad I asked.thanks again.

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1987 F-150 300 L6 4sp 2wd
K&N, flowmasters

 

Since we are on this topic I am needing help deciphering my axle code as well-it sys H9-Max-can you help me out? Thanks

94 F150 4x4
K&N FIPK
5.0

Actually I found the answer already- 3.55 limited slip- thanks

[This message has been edited by Injun Bill (edited 02-20-2001).]