Driven Gear
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Post Fiend
Joined: May 2012
Posts: 14,724
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From: Gods Country, Kansas
Driven Gear
I need help getting the right driven gear for my new 1975 F-250 Highboy. It has a NP-435 with a Divorced NP-205 with 4.10 gears and 36in tires. I don't know how to run the calculations and I haven't found the right thing on google or on here. Any help is appreciated!
Cargo Master
Joined: Nov 2010
Posts: 3,172
Likes: 101
From: darlington
drive gear
Jeffs Bronco Graveyard has a nice chart in their parts catalog,4:10s 35/36 your good to go.....thats what Im shooting for on my truck 35s x 16.5....I have 4:10 gears ratio as well ck out their chart on rpms
Laughing Gas
Joined: Dec 2007
Posts: 1,052
Likes: 2
From: Alvarado, TX
Here's the one that I have used. Use 1000 for the speedo revs per mile input and 8 for the drive gear tooth count. It says you need a 18 tooth driven gear.
Speedo Gear Calculator - Wallace Racing
Speedo Gear Calculator - Wallace Racing
Laughing Gas
Joined: Dec 2007
Posts: 1,052
Likes: 2
From: Alvarado, TX
No problem. I had to by one recently and I found it cheapest on Ebay. Make sure you get a right handed one. The price on this one would be hard to beat.
Ford SPEEDOMETER GEAR 18 tooth YELLOW | eBay
Ford SPEEDOMETER GEAR 18 tooth YELLOW | eBay
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Cargo Master
Joined: Nov 2010
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From: darlington
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Post Fiend
Joined: Apr 2008
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From: Big Sky Country
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Post Fiend
Joined: May 2012
Posts: 14,724
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From: Gods Country, Kansas
HAHA!
Post Fiend
Joined: Apr 2008
Posts: 8,261
Likes: 15
From: Big Sky Country
I ordered mine online, on their website, that was a few years ago and they kept sending them, maybe they've changed their protocol, but i'm sure a quick phone call would nab you a catalog.