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1973 - 1979 F-100 & Larger F-Series Trucks Discuss the Dentsides Ford Truck
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Old Aug 13, 2007 | 03:25 PM
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9inch rear end

Could Someone Please Decode This Tag On 9 Inch Rear End? 78ford F100 . Thanks
Wdm Bv4 7ja
2.75 9 3518
 
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Old Aug 13, 2007 | 04:11 PM
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Welcome to the site!

Besides it being an Open Ford 9" with a 2.75:1 ratio...... what else do you need to know ?

 

Last edited by Mil1ion; Aug 13, 2007 at 04:13 PM.
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Old Aug 13, 2007 | 05:22 PM
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thanks for the quick reply, what does the 7ja stand for?
 
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Old Aug 13, 2007 | 05:28 PM
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That should be a " Number / Letter / Number" ...... for the cast date code.

7 = 1977
J = September
A (should be number) for actual day what number does "A" look like ?
 
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Old Aug 13, 2007 | 05:42 PM
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Its A Very Clean Tag, The Top Line Is Wdm Bv4 7ja And It Is Divided Just Like That And The Bottom Line 2.75 9 3518 Now What Does The 3518 Mean? And Do You Think I Should Change The Gear If It Is Hooked To A 351m With A C-6 Trans. Thanks For The Help, I Am Trying To Restore My Dads Old Truck For Him,he Bought New In 77 And It Really Needs Some Help. And I Am About To Deploy To Iraq Later This Week And Want To Get All The Numbers Right So I Know What To Do When I Ge Back.... Thanks
 
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Old Aug 13, 2007 | 05:47 PM
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3518 is the casting plant code.

see the ID tag I posted.


The "lower the number ratio " the less the engine revs and the less fuel you would normally burn depending on many things.

Changing it ?

it depends on what you were going to use the truck for
 
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Old Aug 13, 2007 | 07:09 PM
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Hi 78 F100, my 79F150 has the 351m, C6, 2.75 rear and is fine. You can always change the gear later, after the restoration is done, if it isn't enough. If you are doing it for your father, I would ask him first if he feels like spending a little more for fuel. Hey, good luck over there.
 
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Old Aug 13, 2007 | 08:44 PM
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That gear is just fine you could go to a 295 or a 300, just what is pops doing? if he uses it a round the farm and haules loads (cows) and stuff then go higher if its a general get me to work truck then stay like you are.
 
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Old Aug 13, 2007 | 09:19 PM
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What I Really Want To Do Is Put It Back To Original Specs, The Vin # States It Was A "g" Code 302 2v 2 Barrel Carb.

So I Was Wondering If I Went With A Rebuilt 302, Would A Larger Gear Give It Some Nuts. I Put A Lifetime Warranty C-6 Trans From Ammaco Last Week And Replaced Shocks Brakes Rotors Turn Signal Switch And Oil Change. But The Motor Is Shot. It Leaks (rear Mains) And Smokes Like A Chimney. And The Truck Is Like A Fish Out Of Water Right Now. I Brought It To Jacksonville Fl To Get It Done. It Will Go Back To Baton Rouge And Be A Week End Driver (like A Red Neck Hot-rod) . The Farm Life Is Done, The Super Duty And The Old Chevy 454 Duelly Took Its Spot A Couple Of Years Ago And I Couldnt Bear To See It Left In The Field To Die. So Any Suggestions Would Be Great.
 
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