Which rear end?
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Lead Driver
Joined: Jul 2011
Posts: 6,599
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From: Rockingham, VA
Which rear end?
My 51 F4 is stock. The Shop Manual says the two rear axles available for the F4 are 8T-4209C with 5.14 gear ratio OR 8T4209B with 5.83 gear ratio.
The number stamped into the axle housing is 1133. The Illustrations Parts Catalog shows the 48-52 TL uses a Timken 51524.The Parts Text Catalog shows this is a Ford rear axle.
Here's the stamp. Does anyone know what this rear axle is and is there a reference for the gear ratio?
The number stamped into the axle housing is 1133. The Illustrations Parts Catalog shows the 48-52 TL uses a Timken 51524.The Parts Text Catalog shows this is a Ford rear axle.
Here's the stamp. Does anyone know what this rear axle is and is there a reference for the gear ratio?
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Lead Driver
Joined: Jul 2011
Posts: 6,599
Likes: 34
From: Rockingham, VA
I think I'll have to jack up the rear end, mark the drive shaft, and rotate a wheel through one full turn counting the turns on the drive shaft. That will tell me the ratio won't it? 10.25 turns for the 5.14 and about 11 2/3 turns for the 5.83.
Will that work?
EDIT: I did this division incorrectly,,, see below
Will that work?
EDIT: I did this division incorrectly,,, see below
Marmon-Herrington Man
Joined: Jul 2005
Posts: 11,984
Likes: 444
From: Central Illinois
My 51 F4 is stock. The Shop Manual says the two rear axles available for the F4 are 8T-4209C with 5.14 gear ratio OR 8T4209B with 5.83 gear ratio.
The number stamped into the axle housing is 1133. The Illustrations Parts Catalog shows the 48-52 TL uses a Timken 51524.The Parts Text Catalog shows this is a Ford rear axle.
The number stamped into the axle housing is 1133. The Illustrations Parts Catalog shows the 48-52 TL uses a Timken 51524.The Parts Text Catalog shows this is a Ford rear axle.
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Lead Driver
Joined: Jul 2011
Posts: 6,599
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From: Rockingham, VA
Joe - can't help with the case stamping code, and sounds like you and Ross have the method for figuring out the ratio, but I think you've been victimized by the confusing info in the 1964 reprint chassis catalog. The Timken 51524 axle was used in the F-2, F-3, and P.D. models (D, Y, and J), (and was also used in the earlier tonner model), but not in the F-4 (Model TL). The book you're looking at shows the 51524 diagram as typical for the single speed Timken, but it's wrong that that axle was used in an F-4. The text section shows that the 48-50 TLs used Timken model 53566, then switched to some ill described "Ford" axle in '51 and '52. But if you go back to the original Jan. '52 edition or Jan. '54 edition of the chassis catalog it's shown that the Timken 53566 was used for the whole F-4 model run '48 to '52. Same part numbers for the case halves for all years. Just an FYI. Stu
Thanks Stu.
It is rather confusing to have so many different descriptions "in writing" in official (looking) Ford documentation. Thanks for clarifying that for me. I wrote it down...
Hotshot
Joined: Oct 2009
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From: Burbank, WA
Confusion arising from reading Ford parts catalogs is usually self inflicted. It's important to remember that these catalogs are not assembly manuals. They are simply a listing of interchangeable, replacement parts available from Ford at the time of printing. The more time that passes between the assembly of the subject vehicle and the printing of the catalog, the greater the chance the information is unreliable for determining OEM installed equipment, as replacement parts often become whatever is on the shelf that will work to keep a vehicle on the road. It's a common misconception among a lot of people to believe the parts catalog is gospel for original assembly details.
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Thread Starter
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Lead Driver
Joined: Jul 2011
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From: Rockingham, VA
Is this right?
I jacked up one side of the rear end, marked the drive shaft and the wheel, and rotated the tire through one full turn. The drive shaft rotated slightly more than 2 1/2 turns. So I'm guessing my earlier formula is totally wrong, and I need to multiply the number of drive shaft turns by 2 to get the correct number.
5.14 / 2 = 2.57, so I guess my rear axle is a 5.14.
5.83 / 2 = 2.915 and the drive shaft was nowhere near 3 full turns.
I can still pull stumps in granny 1st, but at least maybe I'll be able to do 50 mph.
5.14 / 2 = 2.57, so I guess my rear axle is a 5.14.
5.83 / 2 = 2.915 and the drive shaft was nowhere near 3 full turns.
I can still pull stumps in granny 1st, but at least maybe I'll be able to do 50 mph.
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