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What Do I Have?

What Do I Have?

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Old

Apr 16, 2004 | 06:34 PM

#1

n2music

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Junior User

Joined: Jun 2002

Posts: 62

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From: Mid-Eastern US

What Do I Have?

I want to change my ratio to 3.25 or 3.00 but do not know what rear end I have. The ID plate reads WDM-U 3.70 8AC 302. I know that it is 3.70 ratio but what size is it? 7.5, 8, 8.8, 9 or what. Truck revs a bit much for my taste at 55 and 60 mph. Recommendation welcome. Thanks

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Old

Apr 16, 2004 | 07:29 PM

#2

TeulonF250

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Joined: Apr 2004

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what year and size of truck

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Old

Apr 16, 2004 | 07:55 PM

#3

n2music

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Junior User

Joined: Jun 2002

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From: Mid-Eastern US

hmmm? That info used to show up automatically. Anyway 1968 F100 SB 390 w/C6.

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Old

Apr 16, 2004 | 07:59 PM

#4

n2music

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Joined: Jun 2002

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From: Mid-Eastern US

Oh, yup, there it is. You just have to hover your mouse over the Signature area and it will show you what I have.

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Old

Apr 17, 2004 | 03:36 PM

#5

FordPickup460

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Joined: Nov 2003

Posts: 4,392

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From: Cab of a truck

It should be a 9" rear if its stock. If the carrier comes out the front and there is no differential cover on the rear, it is a 9 inch most likely.

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