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

Axle code I9

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Old Nov 14, 2007 | 11:04 AM
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tommythomasson's Avatar
tommythomasson
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Axle code I9

Anyone know what the I9 axle code refers to (gear ratio)? I have a list of all of the codes, but I9 is not listed. Looks like it could also be 19, but that's not on the list either. This comes from the ID tag on the driver's side door frame...

 

Last edited by tommythomasson; Nov 14, 2007 at 11:06 AM.
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Old Nov 14, 2007 | 11:18 AM
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Originally Posted by tommythomasson
Anyone know what the I9 axle code refers to (gear ratio)? I have a list of all of the codes, but I9 is not listed. Looks like it could also be 19, but that's not on the list either. This comes from the ID tag on the driver's side door frame...
It's 19 not I9.

1983/86 Ford Rear Axle / 3.55-1 / Non Limited Slip / 3750 lb. Rear Axle Capacity

1987/91 Ford Rear Axle 8.8 / 3.55-1 / Non Limited Slip / 3800 lb. Rear Axle Capacity

The decoder in the parts catalog doesn't say whether 1983/86 is a 8.8 or a 9 inch.

The 8.8's have a removable inspection cover, the 9's do not.
 

Last edited by NumberDummy; Nov 14, 2007 at 11:20 AM.
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Old Nov 14, 2007 | 12:10 PM
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My '83 has the same axle code. It has a removable cover so I would assume it is an 8.8, too.
 
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