Do the new GM 2500 and 3500 HD's come with 14 bolt full floaters?? There a couple of these trucks at a local boneyard. I know they come with rear discs and if it was a 14ff I would like to bolt in place of my 10 bolt.

Thanks.

depends on application. some are 14's some are some new other thing.

If you think a old 14FF is a trench digger the new one is more so...it has a 11.5" ring gear!

There are 3 "14-bolts" used today on Chevy trucks.

14-bolt semi-floater. (9.5 ring-gear)
This is used on 3/4 tons and possibly heavy-halfs. It has a 2-bearing pinion gear and a 9.5 inch ring gear. Current models are disk braked and come (mostly) as 8-luggers, but there are some 6-lug "heavy-halfs" used on the old C/K body. (I'm not sure if there is a Silverado heavy-half)

14-bolt Full-floater. (10.5 ring gear)
This is the legond, the one everyone else swippes from Chevys. It has a 3-bearing pinion (like a Ford 9inch) and a 10.5 inch ring gear. It has been used for years, and is still in use today. Commonly found today under most heavy 3/4 tons and up to one tons with the 6.0L engine. Also used on the 'gazilloin passanger Express vans, Suburbans and the Silverados w/o the 8.1L or D-max.

14-bolt New-style Full-floater. (11.5 ring gear)
This pig is BIG, very big. I haven't seen one aprart yet, but...
It must run a 2-bearing pinion (lack-of removable pinion bearing suport) and the ring gear is 11.5 inches. It is used exclusivly with the D-max and 8.1L combos. (might be avalibil with the 6.0L, too)


Masher, look for the old 14-bolt 10.5 ring axle, for a conversion. Perferably one thats under the same style truck as you have.

Originally posted by Twiztid

14-bolt New-style Full-floater. (11.5 ring gear)
This pig is BIG, very big. I haven't seen one aprart yet, but...
It must run a 2-bearing pinion (lack-of removable pinion bearing suport) and the ring gear is 11.5 inches. It is used exclusivly with the D-max and 8.1L combos. (might be avalibil with the 6.0L, too)




I thought these were Dana 80's

...and someone told me that the new big one was an Eaton. I don't know. Maybe I'll have to crawl under one this weekend and have a peek.

Originally posted by HeyBeerMan


I thought these were Dana 80's

Definitely not a dana 80...I have one in my dodge.

I've seen a few on a lift but never looked that closely. Appeared to be dana, I'd have to disagree with the "new" 11.5" 14 bolt though.

Originally posted by Aggro


Definitely not a dana 80...I have one in my dodge.

I've seen a few on a lift but never looked that closely. Appeared to be dana, I'd have to disagree with the "new" 11.5" 14 bolt though.

You are right. definetly not an 80. I just went and crawled under mine. I don't know what it is.

It has a big AAM cast in it. Does not look at all like the standard FF 14 bolts

AAM is American Axle Manufacturing. They've been making the IFS front diffs for GM since the beginning. Next model year Dodge is switching to them from Dana (at least on the 2500/3500's). They seem to be taking over.

Originally posted by Lloyd
AAM is American Axle Manufacturing. They've been making the IFS front diffs for GM since the beginning. Next model year Dodge is switching to them from Dana (at least on the 2500/3500's). They seem to be taking over.

there you have it...

American Axle and Manufacturing makes (and always has made) all of the GM corporate axles - 10 bolts, 12 bolts, 14 bolts, and all of the IFS front ends. The new 11.5" rear under the big block and diesel HD trucks is also made by AAM, and since it has 14 bolts holding the cover on, people have started calling it a 14 bolt. It does look a lot like a bigger version of the 10.5" 14 bolt (that has been around since the '73 model year), but the design is somewhat different. It does not have the pinion housing that bolts in from the front like a 10.5" 14 bolt, but it does have the same means of adjusting the backlash using threaded sleeves instead of shims like a Dana axle (and most others, including smaller AAM axles). It also has the unique feature of a harmonic dampener on the pinion yoke. American axle used to be fully owned by GM, but as with most of the other oem parts suppliers, it was spun-off as a separate company a few years ago. That was when they started soliciting business from other OEMs, and subsequently landed the axle contract for the new Dodge trucks.

Originally posted by Twiztid
There are 3 "14-bolts" used today on Chevy trucks.

14-bolt semi-floater. (9.5 ring-gear)
This is used on 3/4 tons and possibly heavy-halfs. It has a 2-bearing pinion gear and a 9.5 inch ring gear. Current models are disk braked and come (mostly) as 8-luggers, but there are some 6-lug "heavy-halfs" used on the old C/K body. (I'm not sure if there is a Silverado heavy-half)



Technically, there IS a Silverado "Heavy Half". But its called a "1500HD" and it comes in a Crew Cab Shortbed style. Looks like a Crew Cab HD Silverado only with the Light Duty front end on it.

Speaking of this rearend, can somebody tell me if this is possible:

Taking an 11.5" 14 Bolt housing, putting in the diff and gears from the 10.5" 14 Bolt and having enough room to make a true High Clearance 14 Bolt without having to machine the ring gear for clearance.

Its just a thought that I've been wondering about as of late.

why?, you'd end up with the clearance of the std. 10.5 " 14 bolt. or am I missing something?

Originally posted by Aggro
why?, you'd end up with the clearance of the std. 10.5 " 14 bolt. or am I missing something?

You know, I didn't realize that until after I had already posted. Thanks for pointing that out.