Gear Ratio

Bronco Maniac · Jan 17, 2018

I have removed my rear end and taken it to the machine shop to replace the ends of the housing. I did not think to look for any tag on the third member and the truck it is at a friends shop on his lift. I took this picture of the markings on the gears. How do you determine gear ratio?

Heck, last week I could not spell mechanic, now I is one. You buy one of these EB and you will learn a lot.

Thanks for any help.

Bickster · Jan 17, 2018

I believe the 10x35 refers to the teeth on the ring and pinion. So 35 divided by 10 is 3.50.

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Apogee · Jan 17, 2018

Bickster said:
I believe the 10x35 refers to the teeth on the ring and pinion. So 35 divided by 10 is 3.50.

X2...or you can count the teeth and do the math. They're usually stamped correctly though.

Bronco Maniac · Jan 17, 2018

We did count the teeth and there were 35. We figured the ten was the diameter???

spap · Jan 17, 2018

10 teeth on the pinion gear

The ring gear is 9 inches

Broncobowsher · Jan 17, 2018

Count the teeth on the pinion gear. You will find 10 of them.

Bronco Maniac · Jan 17, 2018

Thanks. You learn something everyday.

garberz · Jan 17, 2018

I looked into making a small bearing housing into a big bearing. By the time you buy the ends, then pay to have them installed on the housing, it wasn’t a whole lot more to buy the Currie HD from WildHorses. $479 right now.

Bronco Maniac · Jan 18, 2018

garberz said:
I looked into making a small bearing housing into a big bearing. By the time you buy the ends, then pay to have them installed on the housing, it wasn’t a whole lot more to buy the Currie HD from WildHorses. $479 right now.

That is not bad. Free shipping. Wow I got the ends for $110 and the machine shop said $150 for the replacement.

Apogee · Jan 18, 2018

FWIW, you can get the housing ends from Quick Performance for about $65 plus S&H. I put new ends on my F150 housing going under my EB since they were pitted/rusted and I was planning on reusing the axles with SET20 bearings, so I figured I'd start fresh. I then borrowed a Mittler Bros alignment bar from a hot rod shop down the street and welded it up myself. Easy peasy.

Broncobowsher · Jan 18, 2018

IF you have not done it yet, try and find an F150 housing with the big banjo and have the ends put on that. I find the small banjo Bronco housings to fatigue badly near the center section after a lot of use.

Gear Ratio

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