Newer 14 bolts

[switch]

Just scored a Complete SRW ff 14 bolt with disk brakes out of a 2??? chevy truck(dont know wich model or exact year because it was on a frame with no cab and smashed bed) for $70
The only part number on the carrier is AAM40012325 and R040623C an some random number on the ring gear.My question is how can i find out what gears and carrier do i have?
Thanks

[bstott275]

pop the cover...

[MuddyDiesel]

The axle your looking at is a American Axle & Manufacturing (AAM) axle. Produced for both the Dodge truck and Chevy trucks I think.

Here is their website with the solid axles displayed.

http://www.aam.com/index.php?s=45

[BigBlueToy]

I am shopping the scrap yards for a new rear end and am wondering if anyone makes gear for these newer chevy axles???

[guidolyons]

Ahhhh.... yes, http://www.ringpinion.com/DiffTypes.aspx

There is an AAM 9.5" (front), rear 10.5" and 11.5 versions all with 14 bolt covers, used in GM and Dodge, not the same as the venerable GM 10.5" 14BFF.
http://www.aam.com/file.php/255/axle+shaft+brochure.pdf

[Moore87]

The 14bolt FF that has the 10.5" ring gear that came in 2500HD and 3500 trucks only came with 4.10 gears. The 8.1L and Duramax trucks come with 14bolt 11.5" rearends with 4.10 or 3.73.

[just4cuz]

It also appears that the AAM 14 bolt has a bigger casting for the centersection than the old GM 14 bolt, or am I seeing the 11.5 ring gear ones. They just look like they have less ground clearence than the GM 14 bolt.

[79chevy39.5's]

i know the aam 11.5 dwarfs a 80 pinion they are some massive rears

[just4cuz]

Yea, looked in the brochure and a lot of it is just GM stuff manufactured by AAM now. Except the 11.5, that baby is huge!

[freyguy]

Might just have to measure, but the 11.5 is much bigger housing than the 10.5. I have the AAM10.5. Here's some pics:





If you have an AAM10.5, the only company that makes gears for it is Precision.

[Red Chevy]

Originally Posted by freyguy

Might just have to measure, but the 11.5 is much bigger housing than the 10.5. I have the AAM10.5. Here's some pics:





If you have an AAM10.5, the only company that makes gears for it is Precision.

their should be plenty of aftermarket support for the 10.5AAM pictured(common 14bolt FF for about 40years) The other 10.5 AAM is the dodge version in the '03 to present 3/4 tons, may not be too much aftermarket support for these yet.

[just4cuz]

The AAM 10.5 looks very much like the old GM 14 Bolt. Center section casting is a little different but the cover and pinion bearing assembly look the same.
Freyguy you get about 4 inches out of those springs? What are they, they got 3 more leaves than stock and the material looks a little thinner than stockers too. plus you dumped the overload!

[Red Chevy]

The only difference in the axle pictured above and the one that GM has used for the last 40 years is the webbing on the diff and some slight hub/drum setups. Below is a picture of the "new" 14bolt only available in a dodge, very much of a different axle assembly.

[freyguy]

I was told that the gear sets are completely different too. Randy's doesn't have anything that fits the AAM10.5 which surprised me. I think Precision quoted me a price for AAM specific gears, but they could just be 14bff gears. But the guardsman is for a standard 14bff.

The springs are actually 7" Betts leaf springs. I wanted to go Deaver, but they only come in 6" or 8", and to custom make me a set of 7"s was going to be outrageous. Cognito had the Betts in stock for around $630 (Plus about $120 to ship). They don't have a military wrap, but thats no huge deal. I was also a bit concerned about ditching the overload spring, but I've put some big loads in the bed and these springs have handled it just fine.

[sharpshooter]

Originally Posted by freyguy

I was told that the gear sets are completely different too. Randy's doesn't have anything that fits the AAM10.5 which surprised me.

They are different than the 10.5 corporate and Randy's does have them 3.73-4.56

[Red Chevy]

From www.ringpinion.com , GM 14T aka corporate 14bolt used from 1973 to present.

GM 14T
View Parts List

14 bolt rear cover with 10.5" ring gear. Has full floating 30 spline axles and a 6 bolt removable pinion support.
Ring Gear Diameter:
Ring Gear Bolts: (12) 9/16 x 18 RH
Cover Bolts: 14
Carrier Breaks: 4.10 / 4.56
Spline Count: 1.750 / 30
Float: FF
Semi-Float Type:
Pinion Support: True
Axle Lugs:

Compatible with Models: 1 Ton GM Pickup: 1973 - 2006 (Rear)
1 Ton GM Van: 1973 - 2004 (Rear)
3/4 Ton GM Pickup: 1973 - 2006 (Rear)
3/4 Ton GM Van: 1973 - 2006 (Rear)



Chrysler 10.5" aka dodge 14 bolt compatible with 2003-present dodge trucks, completely different axle.

Chrysler 10.5
View Parts List

14 bolt rear cover with 10.5" ring gear. Has full floating axles.
Ring Gear Diameter: 10.5
Ring Gear Bolts: (12) 9/16 x 18
Cover Bolts: 14
Carrier Breaks: none
Spline Count: 1.750 / 30
Float: FF
Semi-Float Type:
Pinion Support: False
Axle Lugs:

Compatible with Models: 3/4 Ton Dodge Pickup: 2003 - 2006 (Rear)

[just4cuz]

The overload really is a cost cutter for the OEM's. A well designed spring (thinner leaves but more of them) will work just as well if not better. To run a 4 leaf spring with an overload saves money in the cost of steel and makes for a lighter spring. However the overload is really not very progressive and stiffens up real quickly with a load. I took my sons overloads out of his 94 2500 and replaced them with a straight 24" long overload out of a Tahoe. The springs gained about 3" of compression travel before it comes close to the overload and will go completely flat when loaded and still not be much lower than the front of the truck. Of course it still has the original Chevy tail high stance, soon to be addressed with new torsion bars. Being close to an industrial area with a lot of trucking, we have a spring shop close by that will build you custom springs and install them for about what you paid for your springs minus shipping. So you are right in the ball park for what you paid.