Help with rear-end code

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Sep 7, 2008 | 01:07 AM

70mazie

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Joined: Nov 2007

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Help with rear-end code

I have a 70 Custom with a 300 CID and a 4 speed. The rear end code is
WDM-T 9JE
3.50 8 7 311A

I assume that the 3.50 is the ratio. What would be the next step higher that might give me a better range with the 4 speed?

Thanks

Sep 7, 2008 | 01:54 AM

85e150

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Joined: Apr 2004

Posts: 34,466

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First is real low in your trans, right?

3.00 or the 2.75(approx) gears will make a pretty big diff and you'll still be able to launch with your low first gear.

You can plug in your numbers here to see the results; you need your tire diameter.

Novak Conversions - Gearing & Gearing Math for Jeeps

Sep 7, 2008 | 04:29 AM

NumberDummy

Ford Parts Specialist

Joined: Nov 2006

Posts: 88,826

Likes: 783

From: Simi Valley, CA

Quote:

Originally Posted by 70mazie

I have a 70 Custom with a 300 CID and a 4 speed. The rear end code is WDM-T 9JE 3.50 8 7 311A

I assume that the 3.50 is the ratio. What would be the next step higher that might give me a better range with the 4 speed?

Thanks

WDM-T = Ford 9" (8.7 - 8 3/4" Ring Gear) / 3.50-1 / non Limited Slip / Slim Line (Tapered Roller) Differential Bearings / Large Axle Bearings / 3300 lb. Rear Axle Capacity.