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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

axle code? 1979 or 1980

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Old Dec 10, 2009 | 08:56 AM
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axle code? 1979 or 1980

ok my truck was manufactured in 12/79
but its an 80 model
the axle code on the door is (14)
i would like to know what gears are in it because im going to rebuild the front & rear diffs
starting with the rear & i would like to order a master kit for it
it comes with the new gears
 
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Old Dec 10, 2009 | 11:00 PM
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My 81 has a axle code of 14 also.

Ford 3750# Capacity 3.00 Ratio Non Locking
 
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Old Dec 11, 2009 | 09:54 AM
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have u acually seen that stamped on the gears ?
cause thats what i though mine should be but it doesn't seem that high geared & i have 33" tires
& i know they are the original gears
but ur right about the no-locking part
the front & the rear both are open diff
my question is why do they call it a 4wd
really if it dosen't have lockers its only 2wd lol
 
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Old Dec 11, 2009 | 10:09 AM
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my question is why do they call it a 4wd
really if it dosen't have lockers its only 2wd lol
At least their consistent. 2wd should be called 1wd.
 
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Old Dec 11, 2009 | 02:32 PM
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I guess I have a true 2wd then (rwd dually, open diff). An open diff ft and rear in a dually would be 3wd, put a locker in the rear and youve got a 5wd... Could get confusing really quick
 
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Old Dec 11, 2009 | 05:06 PM
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Originally Posted by jetblack06
ok my truck was manufactured in 12/79
but its an 80 model
the axle code on the door is (14)
i would like to know what gears are in it because im going to rebuild the front & rear diffs
starting with the rear & i would like to order a master kit for it
it comes with the new gears
New year models usually begin in August of the Prior Year. there are exceptions but not in this case.

So a truck built 8/79 to 7/80 would be a 1980 year model.

1981's: 8/80 to 7/81 are 1981 year models etc...

Look at the axle tags, (If they are still present) and if you are in doubt the axles are original. That will tell you the code for each axle and if they are limited slip or not.

The tag will have a group of numbers and letters. And a section of the tag is the axle ratio. Example: Tag marked with a group of numbers, "3.50" would be 3.50 ratio non-limited slip. "3L50" would be 3.50 ratio with limited slip.
 
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Old Dec 11, 2009 | 05:27 PM
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Originally Posted by jetblack06
my question is why do they call it a 4wd
really if it dosen't have lockers its only 2wd lol
Technically speaking it's still 4wd even without the limited slip, or lockers.

Power goes to both wheels of each axle, including the ones without limited slip. What happens is on non limited slip axles the most power goes to whatever wheel is turning the fastest. This is so you don't tear the tires off when you turn corners. One wheel has to go a little faster than the other around curves. The down side to this, is when you get stuck, it's the wheel that turns the fastest that gets the most power. IE: You get stuck.

On Limited slip axles, when enough centrifugal force, (Spinning) is happining to one wheel, it transferes some of the power to the wheel that isn't slipping.

On Lockers, with the axle locked both wheels get 50% equal power no matter what. Very bad on tires.

Hope this explains it.
 
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Old Dec 14, 2009 | 08:27 AM
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Originally Posted by 81-F-150-Explorer
Technically speaking it's still 4wd even without the limited slip, or lockers.

Power goes to both wheels of each axle, including the ones without limited slip. What happens is on non limited slip axles the most power goes to whatever wheel is turning the fastest.
so power only goes to one wheel at a time on each axle with an open diff
technically a 2wd
lol
 
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Old Dec 14, 2009 | 08:40 AM
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Originally Posted by 81-F-150-Explorer
Look at the axle tags, (If they are still present) and if you are in doubt the axles are original. That will tell you the code for each axle and if they are limited slip or not.

The tag will have a group of numbers and letters. And a section of the tag is the axle ratio. Example: Tag marked with a group of numbers, "3.50" would be 3.50 ratio non-limited slip. "3L50" would be 3.50 ratio with limited slip.
thanks big help!!!
if i were to change gears to a lower gear ratio
how come most of the dana & 9inch gears arn't the same
like dana offers a 3.54 & 9inch is 3.55
would it hurt it to do that
cause i know ur supose to keep them the same otherwise bad things would happen (if the front was turning faster than rear) & u locked it in
 
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Old Dec 14, 2009 | 09:13 AM
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like dana offers a 3.54 & 9inch is 3.55
would it hurt it to do that
.01 difference will not hurt anything.
 
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Old Dec 14, 2009 | 09:46 AM
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thanks i think thats the ratio im gonna go with then
 
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Old Dec 14, 2009 | 02:25 PM
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where would the axle serial # be?
stamped into the axle housing or on a one of the flimsy metal tags
cause i looked for it & theres no flimsy little tag left if the was one
ima gonna take the pressure washer to it today to see if its stamped in it somewhere
& another thing would it be the heavy duty or the light duty 9"
light duty come with 28 spline & a 1 peice wheel bearing
while the heavy duty is 31 spline with a roller bearing & race
 
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