What's the easiest way to find out what gear I have in the "Beast"?

Bart R.

 

"Some" years have the axle code on the door sticker (not all though)

Depending on how accessible it is right now...there is a 'tag' on the rear axle (maybe 1/2" by 2") with numbers stamped on it.

Once you get the code from either of these sources...report it back here and we can tell.

I think a 31 is a 3.73 non-limited slip (that's what I orginally had).

I think a 33 is a 4.30 but not sure if LS or not...

My code is on my drivers door sticker though...

Take a look and see what you got and let us know.

If all else fails...if you drive in OD at 65 and you are turning ~1800RPMs you have 3.73's.

If you drive in OD at 65 and are turning ~2200RPMs you have 4.30's.

joe.

 

What do you have 4.30s or 3.73s?

 

Bart, like joe said, u can tell by the door jam. But what are the specs of ur truck? Dont some trucks (with diff engines, etc) come standard with diff gearS?

 

If the first digit of the code is consonant, then you have Ford's Limited Grip ...er...Slip rear end.

 

Is that the first digit of the non-existant Door Jamb code (for me anyway), or the code on the differential?

Ryan

 

Ryan,

If you notice in my post above I mention that some Ex's may NOT have the code on the door jamb. Have you looked on the rear cover (usually drivers side) of the rear differential for the little metal tag that is attached to one of the cover bolts? The code is back there too.

Are you specifically looking to see if you have a LS or not?

Because the RPM method (provided you haven't changed your tire size) is a very reliable way to tell as well (also in my post above). Now deciphering LS or non...well a code or a wet parking lot I guess would be the only way there!

Thanks Monsta for the tid-bit on the consonant...

joe.

Joe.

 

I am pretty sure I have 4.30's as I am near 2200 RPMs at 65mph. I was just curious if I had the limited slip. I looked at that tag underneath once before, but if I recollect at the time I was having a tough time matching it up to any numbers I was reading. I will crawl under there this weekend and see what I can find out. I guess I could find a wet parking lot, again no water coming till the weekend.

Thanks,
Ryan

 

Could also try jacking up the rear of the truck, make a chauk mark on the third member and drive shaft across from each other, then spin the tire 1 complete revolution. if the drive shaft turns 3 3/4 times, 3.73. if little over 4 1/4-4.30. of, course this still wouldn't help with finding out about LS though. I believe with LS, both rear tires would spin opposite, with true locker spin same direction?

 

Well, looks like it's 3.73's for me.

BART R

 

i think it is a requirement that it be on the certification lable..
so here it is...


<TABLE><TBODY><TR><TD vAlign=top width="100%">on the certification lable on the drivers door pillar there should be a place with the axle code ...

if it is a letter or a letter and a number it is limited slip... the numbers or number is the ratio...

Axle Type
31 — 3.73 non-limited slip, F-250/Excursion
C1 — 3.73 limited slip, F-250/Excursion
32 — 4.10 non-limited slip, F-250
C2 — 4.10 limited slip, F-250/Excursion
33 — 4.30 non-limited slip, F-250
C3 — 4.30 limited slip, F-250/Excursion
36 — 4.56 non-limited slip, F-250
C6 — 4.56 limited slip, F-250
41 — 3.73 non-limited slip, F-350 (single rear wheels)
D1 — 3.73 limited slip, F-350 (single rear wheels)
42 — 4.10 non-limited slip, F-350 (single rear wheels)
D2 — 4.10 limited slip, F-350 (single rear wheels)
43 — 4.30 non-limited slip, F-350 (single rear wheels)
D3 — 4.30 limited slip, F-350 (single rear wheels)
46 — 4.56 non-limited slip, F-350 (single rear wheels)
D6 — 4.56 limited slip, F-350 (single rear wheels)
61 — 3.73 non-limited slip, F-350 (dual rear wheels)
F1 — 3.73 limited slip, F-350 (dual rear wheels)
62 — 4.10 non-limited slip, F-350 (dual rear wheels)
F2 — 4.10 limited slip, F-350 (dual rear wheels)
63 — 4.30 non-limited slip, F-350 (dual rear wheels)
66 — 4.56 non-limited slip, F-350 (dual rear wheels)
F6 — 4.56 limited slip, F-350 (dual rear wheels)
81 — 3.73 non-limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
E1 — 3.73 limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
82 — 4.10 non-limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
E2 — 4.10 limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
83 — 4.30 non-limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
E3 — 4.30 limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
86 — 4.56 non-limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
E6 — 4.56 limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
88 — 4.88 non-limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
EW — 4.88 limited slip, F-350 Chassis Cab, narrow frame (dual rear wheels)
G3 — 4.30 limited slip, F-450 Chassis Cab
73 — 4.30 non-limited slip, F-450 Chassis Cab
78 — 4.88 non-limited slip, F-450 Chassis Cab
G8 — 4.88 limited slip, F-450 Chassis Cab
75 — 5.38 non-limited slip, F-450 Chassis Cab
G5 — 5.38 limited slip, F-450 Chassis Cab
GW — 4.10 limited slip, F-450 Chassis Cab
98 — 4.88 non-limited slip, F-550 Chassis Cab
K8 — 4.88 limited slip, F-550 Chassis Cab
95 — 5.38 non-limited slip, F-550 Chassis Cab
K5 — 5.38 limited slip, F-550 Chassis Cab
KW — 4.10 limited slip, F-550 Chassis Cab

there may (should be) a tag on the rearend cover with this information also...


Ryan if the certification tag is missing, the housing tag is you best bet, followed by the other methods listed...you could also see if the ford dealer can print out a equipment list for you by using the vin number...
</TD></TR></TBODY></TABLE>
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cool! I have 3.73 w/ ltd. slip

 

I looked at the tags on the differential today as the code is blank on the door jamb. However, the numbers on the tag don't appear to coincide with the list above. The tag reads:

138F
731059K04

According to what people have said RPM wise, I would have the 4.30's. I had the truck jacked up today and was going to watch the driveline spin as I turned the wheel as mentioned above, but the driveline didn't seem to turn (I must have done something wrong as I am no mechanic). I do know that when I turn one tire forward the other spins backwards.

Ryan

 

Checked mine today. I have the C1 which is 3.73 limited slip. Should be the best for non-towing highway driving.

 

My door jab sticker was blank also. Got under truck, on front differential there was a label that wrapped around axle said 4.30 LS. John