Technical 9” 3rd member

Don't look like race car stuff to me.

 

If you clean the ring gear better close to the location you have in the photo , the teeth count will be posted on the ring gear of both gears . As others have stated you are looking at probably a 3.00 or near ration . That is what I run in my 32 , for fuel mileage . It doesn’t take a lot of gear to make a 2900 lb car move .

 

I got a count on the ring gear. 44 teeth, and on the pinion gear it was kind of hard to count by myself but I came up with 10. That means 44-10 which would be a 4.44 ratio? That is what the guy advertised it as. He also did advertise it as 28 spline.

 

Take the 4 main cap bolts out and gain full access to the pinion OR, black magic marker one tooth and count...

 

Based on the number of teeth that I can see, and the spacing, I get way more than 10.

I would pull the pinion support and get a real count.

 

You can pop the pinion gear out the front by unbolting the pinion housing; just keep track of any shims you find and reinstall them.

With that ratio and 28 spline axles, it's probably out of a six-cylinder truck, maybe 4WD.

 

Thanks fellas. You guys know your stuff

 

I'd say someone has thrown in another ring gear to get that 4.2 ratio. Going by the case and differential casting numbers which probably are original dont seem to jive with ring gear number.
Eh, it's not the end of the world. Set it up and use it. The worst that can happen is it will pull the whole pinion support out when you launch or snap and axle.

 

I have bout a couple with mid 3 gears at $30 a piece. You would have been better off maybe going to a wrecking yard. At least they might have checked the ratio and you could of gotten the whole axle.

 

There is 45-12 = 3:75 and 43-10 = 4:30 but I don't see a ring gear at 44 teeth.

 

Funny, was just looking at my Hollander book this morning. Was looking for 9" ratios. As per them.
4.44=9-40...4.30=10-43...3.91=11-43 and the only one with a 44 tooth ring gear is 2.75 16-44. This is a '75 edition. So there may be others after this. Gene.

 

Now you can build a Bonneville car around the third member...

 

I had an 8" in my 1939 Deluxe Ford. It had a 3.55 gear ratio. It was out of a Pinto wagon with a V-6 and standard transmission

 

The 2 most common ratios in the early 67-77 bronco are 4.11 for 6 cyl and 3.50 for V8's

To the original poster you could slide an axle in it and count the revolutions to figure out the ratio. I thought you might have had Motive gears because they have some odd ball ratios but even they don't have a 4.40

 

I've never paid much attention to the thicknesses of ring gears but for what it's worth the first is a 3.50 and the second is a 3.25

 

I was just out in the shop looking at a 9 inch. 35 teeth on ring gear and 10 on the pinion. =350.

 

Yes I got hosed. 2.75 ratio. I got one if anyone’s looking. Ha ha.

 

Does it have the large or small carrier bearings?

 

I don’t know to be honest.

 

Where in Ore are you located???

LynnW

 

Near Oregon City.