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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum is the premier Duramax Diesel Forum on the internet. Registered Users do not see the above ads.
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Old Yesterday, 11:09 PM   #1 (permalink)
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asm225's Avatar
Join Date: Nov 2015
Location: Walker, Louisiana
Posts: 6
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Newer rear axle swap.

I want to investigate the ultimate upgrade for the rear end in our 6.5L trucks.

Disk brakes
Parking brake
Full floater
Minimal alterations/modifications
Minimal cost
Readily available

The problem that I see with most disc brake upgrades on a 14 volt is that there is no good parking brake. Also, I am looking to re-gear to 3.73 at the same time and I don't want to invest almost $1k into my stock setup.

So, I've thought about putting a Duramax rear end under my 6.5 truck, but I don't want to have to shorten my drive shaft. Recently, however, I found a 2005 Chevy C2500 with a 6.0 gas engine. It has a 14 bolt that looks identical to mine except that it has factory disc brakes with built-in parking brakes. I haven't found one with 3.73 gears yet though.

My question is, will this rear-end fit in my truck without shortening the drive shaft?
And what other modifications would be necessary?

I understand that new spring perches and shock mounts will be in order, but from my understanding GMT 800 rear ends are pretty readily swappable into GMT 400s. There may also be some difference in width?

1994 EC 6.5L stock Dually
1996 EC 6.5 GMC 2500 Kojo tune on stock vacuum controlled turbo actuator, Bosch boost gauge with Glowshift Boost Bolt, 409K miles on stock engine, smokes like a steam boat since I purchased with 300k miles. Still running
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Old Today, 07:27 PM   #2 (permalink)
Diesel Newbie
Join Date: Apr 2019
Location: Nebraska
Posts: 32
iTrader Score: 0 reviews

If i remember right width is the same between them both at least on 4wd versions. I don't know about 2wd or what your truck is. You will have to move the shock mounts. I think you will just have to get a conversion u-joint for the diff.

1995 K2500 ECLB 6.5
Diamond Eye turbo back
PMD in bumper
Stainless braided Oil cooler lines
S&B air intake
Leroys Lift pump harness
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