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Nov 3, 2005 | 02:52 AM

Duckman101

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rearend tag numbers

i have a ford 9 inch out of a 77 f-150 tag# are WDM-BC2-7EC 3.00 9 3860 whats the gears and will it go in my 79 bronco? the tag is missing on my rearend now so i`m not sure what the gears in my bronco are. how do i go about finding out what they are?

Last edited by Duckman101; Nov 3, 2005 at 02:56 AM.

Nov 3, 2005 | 06:12 AM

tellico racing

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Sounds like 3.00:1.
The 79 bronc probably has 3.50:1 or 4.10:1. Post the info on the bronco's data plate and someone can decode it for you to be sure.

Nov 3, 2005 | 10:28 AM

1975Ford

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Match the front axle tag gear ratio with the rear gears.

3.00 9 translates to a 3.00:1 gear ratio, 9 inch ring gear,

Nov 3, 2005 | 11:46 AM

Mil1ion

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You are going to have to ident the Bronco gears to confirm actually what they are.
There a few methods, the best is to remove the diff and count the splines on both the ring gear & pinion shaft and then do the math.
This beats the guessing or possible gear replacements without the paper work saying so or having the proper tag.

Nov 5, 2005 | 11:15 PM

Duckman101

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thanks for the info thank you

Nov 5, 2005 | 11:55 PM

MBBFord

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From: Louisiana

Yeah, the F-150 has 3.00 gears, and 78 79 Broncos didn't come with anything other than 3.50 gears front and rear, and there is no way you could use a 3.50 up front with a 3.00 out back, unless you took out the front drive shaft or did a gear swap to match the other.

Nov 6, 2005 | 06:55 PM

Duckman101

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well are the splines the same? could i use my 3rd member out of my bronco now so all my gears are the same?

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Nov 8, 2005 | 01:34 AM

Duckman101

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nothing i just cut the axle off goin down the road i was just woundering about splines before i took it apart. didnt want screw up the seals if i didnt have to