Rear axle question
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Rear axle question
I have a 66 F100 LWB styleside that came stock with the 240 3 speed, now has a 300. The rear end is still the original and from the door code is a 370 gear.
My question is; Is my stock rear an open (peg leg) or a traction lock (limited slip) from the factory?
Thanks
My question is; Is my stock rear an open (peg leg) or a traction lock (limited slip) from the factory?
Thanks
Postmaster
Joined: Nov 2001
Posts: 3,351
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From: Escondido, CA
If you are luck it may have a tag on the diff. The ratio will be stamped on it. Look for 3 L 70 or 3 70. The extra character in the ratio will tell if it is anything other then a pegleg. Also the warranty plate should have the same code...
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
The AXLE code will be found on the Warranty Plate, which is located on the left door face below the latch.
1959 thru today: If the AXLE code begins with a letter = Limited Slip.
If with a number, no Limited Slip.
Do not bother looking....if you have a Ford 9 inch rear axle.
1959/67, some 1968's: When Limited Slip was ordered, the rear axle is a DANA 44, not a 9 inch.
First year Ford offered a 9" with Limited slip in an F100: 1968.
You could get Limited Slip (Ford: Equa-Lok) in 1959/67 Passenger Cars with a 9 inch, but not in F100's.
1963/72 F100 = 09 is the AXLE code for 3.70-1 w/o L/S.
1959 thru today: If the AXLE code begins with a letter = Limited Slip.
If with a number, no Limited Slip.
Do not bother looking....if you have a Ford 9 inch rear axle.
1959/67, some 1968's: When Limited Slip was ordered, the rear axle is a DANA 44, not a 9 inch.
First year Ford offered a 9" with Limited slip in an F100: 1968.
You could get Limited Slip (Ford: Equa-Lok) in 1959/67 Passenger Cars with a 9 inch, but not in F100's.
1963/72 F100 = 09 is the AXLE code for 3.70-1 w/o L/S.
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I am now trying to clean the tag on the housing, I will give that info a bit later. My Warranty tag is as follows:
F10AD789905
129 H F100 481 C 09
05000 129 4000 61
What I know of the tag is F100 with 240 built here in Dallas assembly. Is truck has spent its entire life here.
Axle is 370 which ist does feel like. But a friend said all trucks had limited slip but I do not feel that is true but I am new to the Slick ownership and am trying to learn.
Brian
F10AD789905
129 H F100 481 C 09
05000 129 4000 61
What I know of the tag is F100 with 240 built here in Dallas assembly. Is truck has spent its entire life here.
Axle is 370 which ist does feel like. But a friend said all trucks had limited slip but I do not feel that is true but I am new to the Slick ownership and am trying to learn.
Brian
Cargo Master
Joined: Oct 2005
Posts: 2,084
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From: Stanton, Michigan, USA
I am now trying to clean the tag on the housing, I will give that info a bit later. My Warranty tag is as follows:
F10AD789905
129 H F100 481 C 09
05000 129 4000 61
What I know of the tag is F100 with 240 built here in Dallas assembly. Is truck has spent its entire life here.
Axle is 370 which ist does feel like. But a friend said all trucks had limited slip but I do not feel that is true but I am new to the Slick ownership and am trying to learn.
Brian
F10AD789905
129 H F100 481 C 09
05000 129 4000 61
What I know of the tag is F100 with 240 built here in Dallas assembly. Is truck has spent its entire life here.
Axle is 370 which ist does feel like. But a friend said all trucks had limited slip but I do not feel that is true but I am new to the Slick ownership and am trying to learn.
Brian
Brian,
Your friend is wrong.
See Bill's earlier post.
"1963/72 F100 = 09 is the AXLE code for 3.70-1 w/o L/S".
So assuming no one has changed the differential or ring & pinion, you've got a 3.70 ratio ring & pinion with a "peg-leg" differential.
That is probably a good fit with your 300" I-6. What trans are you running now?
BarnieTrk
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
I am now trying to clean the tag on the housing, I will give that info a bit later. My Warranty tag is as follows:
F10AD789905
129 H F100 481 C 09
05000 129 4000 61
What I know of the tag is F100 with 240 built here in Dallas assembly. Is truck has spent its entire life here.
Axle is 3.70 which it does feel like. But a friend said all trucks had limited slip
(sigh) 
Limited Slip was first offered as an option in 1959, it's still optional today.
F10AD789905
129 H F100 481 C 09
05000 129 4000 61
What I know of the tag is F100 with 240 built here in Dallas assembly. Is truck has spent its entire life here.
Axle is 3.70 which it does feel like. But a friend said all trucks had limited slip
(sigh) Limited Slip was first offered as an option in 1959, it's still optional today.
F10 = F100 2WD
A = 240 1V I-6
D = Dallas TX Assembly Plant
789905 = 1966, assembled December 1965.
129" Wheelbase
H = Sahara Beige.
F100 = F100 2WD / 5,000 lbs. GVWR.
481: 4 = Medium Beige Crush Vinyl & Medium Beige Wicker Pattern Vinyl // 81 = 81A Standard Cab
C = Ford Type 3.03 3 Speed Manual all Syncromesh Transmission
09 = Ford 9" Rear Axle / 3.70-1 / non Limited Slip / 3300 lb. Rear Axle Capacity.
5,000 lbs. Gross Vehicle Weight Rating
129 net HP @ 4,000 RPM.
61 = Dallas TX Ford District Sales Office, where the original selling dealer ordered the truck from.
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