9" carrier bearing size ??? [Archive] - FSB Forums

: 9" carrier bearing size ???

06-26-2010, 11:02 AM
What size carrier bearing do we have in the 78/79 9"??

Both of these carrier bearing sizes are for 31 spline
3.062" O.D.
2.891" O.D.

I blew the spider gears and broke the carrier in my 78. I have the 3rd member out of the bronco but the parts are at the shop that did the gears and there closed today.

So instead of having them get a stock carrier Im buying a Detroit for it today off ebay and putting it in,but for the life of me i cant remember the right bearing size. And the listing ends in a few hrs

Jeffs is showing 2 different sizes for the bronco??? or same years. as with the 20 other sites i looked at.

Jeffs is not the only place ive looked.

1978-86 Ford Bronco 3.062" O.D. ???

1978-86 Ford Bronco 2.891" O.D. ???

I cant even find my old bearing to measure them. and i need to get it fixed asap its my DD

06-27-2010, 09:17 PM
Damn no one knows

06-27-2010, 10:19 PM
i thought a 9" was a 9" but.............
Another fairly common 9-inch case is the "WAR" casting, with two 12- and 6-o'clock ribs, very similar in appearance to the smaller '67-and-up 8-inch case, and the heavy-duty 9-inch "N" case. The "WAR" case doesn't employ the high nodular-iron witnessed with the C7AW-E case mentioned earlier. The "WAR" case pinion pilot support doesn't have as much iron either, making it more prone to failure. The "WAR" case is more common with the earliest 9-inch axles from '57-'65. The C7AW-E single-rib case is common from '67 and up, making it more plentiful. have also seen the single-rib casting with different numbers--C1AW-C, C4AW-A, and C4AW-C--indicating an early '60s origin. This makes the C7AW, C1AW, and C4AW single-rib case quite common.

There is also the "WAB" case, which is similar to the "WAR" case in appearance. Where the "WAB" case differs is differential side bearing size (3.063 inches in diameter). The "WAB" case isn't shown here. The most common 9-inch differential side bearing size is 2.892 inches in most applications.

06-27-2010, 10:22 PM
I believe my '82 (as well as my friends '80) had the smaller bearing size (2.891). i installed an ebay detroit locker as well (in both) one of them came with the wrong size bearings so i just changed them. the inner part of the bearing is the same size, so worst case scenario, just get a couple new bearings..

06-28-2010, 11:05 AM
Your both right H case is big bearing 3.250(after market case)This is the only case that has a different size inner bearing I.D. cause it will take 35 spline axle's.
And the B case is the factory standard. But after reading 50 frincken thousand post on sites. The B case has 2 different bearing options for 31 spline 3.0625 and 2.891 But they both have a I.D. of 1.78" on the carrier bearing.
So Like you said and what I was thinking to.

Most of the Nascar lockers on ebay are for The factory standard B case 31 spline with a 9" 2.891 bearing seat.And like you pointed out both of the 2.891 and 3.0625 have a carrier bearing inner I.D.of 1.78". So if I buy one of the nascar Detroit lockers Like i posted ill just to get the bigger O.D.3.0625 bearings and swap them. my brain hurts right now

Jeffs listing 2 different bearing sizes for the 9" throw me for a lil loop

I did win a Detroit locker off ebay this morning:thumbup

06-28-2010, 11:12 AM
You are buying the daytona pinion support also,right? Bigger bearing=more support!!:thumbup My Strange center section was a 3.06 bearing if i remember right.

06-28-2010, 11:24 AM
I wish, been out of work since Christmas and just now work is kicking off. If i had 250.00 more bucks i would of got one of the the whole 3rd member that are all set up for 35 spline axles. But this will have to do for now. Our Rubicon trip is in 40 days clock is ticking and a lot has to get done still.

06-28-2010, 01:32 PM
Be carefule with the circle track lockers, my first off of Ebay was advertised as a 31 spline 3.06 bearing, ended up being a 31 spline 3.25 bearing, which no one had ever heard of even existing. Since the bearing OD was so big on the locker I couldn't find an adapter bearing and had to re-sell it, which wasn't easy.

Anyway, I have another circle track locker now, which has worked awesome over the last 3 years. Just keep in mind that these are LOUD, louder than a regular Detroit, and people will tell you that your truck is broken when you drive through a parking lot. But street manners otherwise are pretty good.

06-29-2010, 10:30 PM
Just thought i would put up a pic of the problem. If some of you don't know This carrier should be in 1 piece.