New style rear axle? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Critter · 11-03-2007, 01:53 AM

I was daydreaming a little today...who here has installed a newer-style Chevy rear end (1999-200? model) in their K5 or K10? I figure rather than spend the time and money to rebuild my original and buy a disc kit for it, I might consider a whole different axle.

vtblazer · 11-03-2007, 06:59 AM

I've got a '98 3/4 ton 14 bolt FF rear axle with disc's in my off road blazer.

Critter · 11-03-2007, 10:44 AM

IIRC the 98s still had drum brakes, correct? I am mainly curious if someone was able to utilize the factory rear discs starting in 99 (on the 1/2 tons, a couple years later on the 14FF I think) and get the ebrake and what not to work properly.

Correct me if I'm wrong on the year models that I am spitting out, I'm getting old and forgetful!

vtblazer · 11-03-2007, 11:11 AM

Quote:

Originally Posted by Critter

IIRC the 98s still had drum brakes, correct? I am mainly curious if someone was able to utilize the factory rear discs starting in 99 (on the 1/2 tons, a couple years later on the 14FF I think) and get the ebrake and what not to work properly.

Correct me if I'm wrong on the year models that I am spitting out, I'm getting old and forgetful!

You could be right, mine may of been converted.
(was already installed when I got the blazer)

No accomadation for e-brake either, sorry thought it might of helped.

At least we know they fit under the trucks.

faribran · 11-03-2007, 11:15 AM

so, are you saying they are a close enough fit (in length) to work?

vtblazer · 11-03-2007, 11:23 AM

Quote:

Originally Posted by faribran

so, are you saying they are a close enough fit (in length) to work?

Correct, they fit fine.

Burt4x4 · 11-03-2007, 11:42 AM

FirstGen spring perches are set inword about 1.5" from the location of a 73up 14ff. My 2005 Duramax has rear disk on it's 14ff. I could measure it but I would guess the spring perch is too wide for a 'bolt in" affair. I do belive the axel length is the same still but I am guessing...

vtblazer · 11-03-2007, 12:00 PM

Quote:

Originally Posted by Burt4x4

FirstGen spring perches are set inword about 1.5" from the location of a 73up 14ff. My 2005 Duramax has rear disk on it's 14ff. I could measure it but I would guess the spring perch is too wide for a 'bolt in" affair. I do belive the axel length is the same still but I am guessing...

Yeah, I was talkin' overall width, not specifically perch measurement's.

There's always going to be custom work needed when you change em up.

onetonk5 · 11-03-2007, 03:54 PM

The rear axle in your Duramax isnt the good ole Corporate 14 bolt.....Im 99% sure its a AAM axle.

Burt4x4 · 11-03-2007, 04:16 PM

Quote:

Originally Posted by onetonk5

The rear axle in your Duramax isnt the good ole Corporate 14 bolt.....Im 99% sure its a AAM axle.

Hmm I have no clue..at a glance it looks like a 14..after the glance I just ASSumed I knew what I was looking at...A BIG REAR END = 14bolt

Critter · 11-03-2007, 05:02 PM

Quote:

Originally Posted by onetonk5

The rear axle in your Duramax isn't the good ole Corporate 14 bolt.....Im 99% sure its a AAM axle.

I think you are right. That is also what my '06 Cummins has in it (actually, I think the front and rear are both AAM). I don't know how similar they are to the GM version, but I bet they are close. Does anyone know how the AAM compares to the 14FF for wheeling? So far all I have heard is that there aren't many options if you want to change your gear ratio. I have done a little research but would love some more info.

http://www.aam.com/index.php?s=25

Jtrux · 11-03-2007, 05:17 PM

Are van axles from the late 90's and 2000's still wider than truck axles?

70rs/ss · 11-03-2007, 05:20 PM

Be careful now, on the newer style rears (half ton for sure, but not positive on the 3/4 ton and up), but the pumpkin is offset (not centered) to make up for the fuel tank between the framerail and the driveshaft. The drivers side a bit longer than the passengers side is. Other than that, with new spring perches near anything will fit!!

earl87gta · 11-03-2007, 09:15 PM

the new rear AAM axle like in my d-max is huge compaired to a 14blt axle it has a 12.5 ring gear in it and the axles are way bigger.

11-03-2007, 01:53 AM	#1
Critter Future TOTM Winner Join Date: Aug 2006 Location: Bulverde, TX Posts: 2,692	New style rear axle? I was daydreaming a little today...who here has installed a newer-style Chevy rear end (1999-200? model) in their K5 or K10? I figure rather than spend the time and money to rebuild my original and buy a disc kit for it, I might consider a whole different axle. __________________ 72 Chevy CST K5 HIGHLANDER BLAZER Getting a 6.0,NV4500,NP205,14BFF (Currently laying all over the place in little pieces) 72 Chevy swb step-side "LS" 6.0 Here's a build thread of sorts 2002 HD2500 Crew Cab, 8.1L Allison 4x4 Daily Driver Check it out www.lsdyno.com

11-03-2007, 06:59 AM	#2
vtblazer Registered User Join Date: Oct 2003 Location: Central Vermont Posts: 8,537	Re: New style rear axle? I've got a '98 3/4 ton 14 bolt FF rear axle with disc's in my off road blazer.

11-03-2007, 10:44 AM	#3
Critter Future TOTM Winner Join Date: Aug 2006 Location: Bulverde, TX Posts: 2,692	Re: New style rear axle? IIRC the 98s still had drum brakes, correct? I am mainly curious if someone was able to utilize the factory rear discs starting in 99 (on the 1/2 tons, a couple years later on the 14FF I think) and get the ebrake and what not to work properly. Correct me if I'm wrong on the year models that I am spitting out, I'm getting old and forgetful! __________________ 72 Chevy CST K5 HIGHLANDER BLAZER Getting a 6.0,NV4500,NP205,14BFF (Currently laying all over the place in little pieces) 72 Chevy swb step-side "LS" 6.0 Here's a build thread of sorts 2002 HD2500 Crew Cab, 8.1L Allison 4x4 Daily Driver Check it out www.lsdyno.com

11-03-2007, 11:15 AM	#5
faribran Registered User Join Date: Jul 2005 Location: AL Posts: 1,828	Re: New style rear axle? so, are you saying they are a close enough fit (in length) to work? __________________ "

11-03-2007, 11:42 AM	#7
Burt4x4 Registered User Join Date: Feb 2000 Location: Modesto, CA Posts: 1,842	Re: New style rear axle? FirstGen spring perches are set inword about 1.5" from the location of a 73up 14ff. My 2005 Duramax has rear disk on it's 14ff. I could measure it but I would guess the spring perch is too wide for a 'bolt in" affair. I do belive the axel length is the same still but I am guessing... __________________ 1972 K5 MPFI454/Sm465/Np205/D60/14FFd/Re-Centerd H1s w/Swamper Iroks

11-03-2007, 03:54 PM	#9
onetonk5 Cereal Killer Join Date: Jan 2006 Location: Montgomery, Alabama Posts: 639	Re: New style rear axle? The rear axle in your Duramax isnt the good ole Corporate 14 bolt.....Im 99% sure its a AAM axle. __________________ If I dont do it....somebody else will.

11-03-2007, 05:17 PM	#12
Jtrux I'm a poor spectator Join Date: Aug 2006 Location: San Antonio, Tx Posts: 2,287	Re: New style rear axle? Are van axles from the late 90's and 2000's still wider than truck axles? __________________ 2006 Jeep Unlimited IMPACT ORANGE 1993 Chevy 2500 4x4 ExCab LWB 454/NV4500 Tow rig 1977 Ford F100 2x4 LWB 1st truck I owned, still have it!!! 1979 Ford F150 4x4 SWB Built Ford Tough!!! 1971 Chevy Blazer 350 / SM465 / NP205 UNDER CONSTRUCTION Soon to have a LQ4 6.0!!!

11-03-2007, 05:20 PM	#13
70rs/ss Registered User Join Date: Dec 2004 Location: Northern AZ Posts: 7,270	Re: New style rear axle? Be careful now, on the newer style rears (half ton for sure, but not positive on the 3/4 ton and up), but the pumpkin is offset (not centered) to make up for the fuel tank between the framerail and the driveshaft. The drivers side a bit longer than the passengers side is. Other than that, with new spring perches near anything will fit!! Last edited by 70rs/ss; 11-03-2007 at 05:23 PM.

11-03-2007, 09:15 PM	#14
earl87gta Senior Member Join Date: Dec 2003 Location: Kingsport TN Posts: 4,641	Re: New style rear axle? the new rear AAM axle like in my d-max is huge compaired to a 14blt axle it has a 12.5 ring gear in it and the axles are way bigger. __________________ Earl 68 2500 4x4 GMC Burb



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