Isuzu 6H / dmax lg4 7.8 swap - The 1947 - Present Chevrolet & GMC Truck Message Board Network

lousblown55chevy · 12-28-2012, 08:50 PM

I have been collecting parts for 4x4 dually crewcab project and already have a 6.0 and a 4L80E trans and complete aftermarket harness. The engine and trans are already mounted and i just came across a great deal on a 07 Isuzu 7.8 and a allison auto from a 07 GMC 7500. Any thoughts or ideas from you guys ?

duallyjams · 12-28-2012, 09:13 PM

The diesel would be bad a** , every one has a 6.0 now days.

**Dieselwrencher** · 12-28-2012, 10:21 PM

The diesel would be sweet, but you're going to have more fitment issues with that 7.8. Be prepared for mods.

leftybass209 · 12-28-2012, 11:45 PM

I did a quick search on the duramax forums and turned up a few posts claiming the 7.8 was gutless. Its also really heavy, especially paired with that Allison. If unique is your thing, its an option. As far as you are with the 6.0 I'd just move forward. Better performance, fuel economy, and lighter weight. Unless you plan on towing or hauling really heavy loads uphill to utilize the 500+ lbs ft of torque, I don't see the 7.8 paying off with little more than a headache.
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**Dieselwrencher** · 12-30-2012, 02:35 PM

Quote:

Originally Posted by leftybass209

I did a quick search on the duramax forums and turned up a few posts claiming the 7.8 was gutless. Its also really heavy, especially paired with that Allison. If unique is your thing, its an option. As far as you are with the 6.0 I'd just move forward. Better performance, fuel economy, and lighter weight. Unless you plan on towing or hauling really heavy loads uphill to utilize the 500+ lbs ft of torque, I don't see the 7.8 paying off with little more than a headache.
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X2 I've never been impressed with them. I think TS Performance offers a chip for them that may help, but I'd go with the 6.6 V8 if I were wanting Isuzu power.

**Bob B.** · 12-30-2012, 06:26 PM

The 6H is very reliable, and some versions had decent power (300/860), but it is a large heavy engine. Much bigger than a Cummins B, about the size of a Cat C-7. Not a good swap choice for a pickup if you ask me.

12-28-2012, 08:50 PM	#1
lousblown55chevy Registered User Join Date: Feb 2012 Location: Saint Charles MO. Posts: 197	Isuzu 6H / dmax lg4 7.8 swap I have been collecting parts for 4x4 dually crewcab project and already have a 6.0 and a 4L80E trans and complete aftermarket harness. The engine and trans are already mounted and i just came across a great deal on a 07 Isuzu 7.8 and a allison auto from a 07 GMC 7500. Any thoughts or ideas from you guys ?

12-28-2012, 09:13 PM	#2
duallyjams Registered User Join Date: May 2007 Location: Deale Md Posts: 4,663	Re: Isuzu 6H / dmax lg4 7.8 swap The diesel would be bad a** , every one has a 6.0 now days. __________________ James 63 GMC V6 4speed carryall 65 chevy swb bbw V8 auto 68 K20 327/4 speed, buddy buckets 2002 GMC CC Dually Duramax 64 GMC lwb 3/4 V6 4speed SOLD 66 GMC swb bbw buddy buckets SOLD IG duallyjams The only thing that stays the same is constant change!

12-28-2012, 10:21 PM	#3
Dieselwrencher 6>8 Plugless........ Join Date: Sep 2007 Location: Prairie City, Ia Posts: 17,140	Re: Isuzu 6H / dmax lg4 7.8 swap The diesel would be sweet, but you're going to have more fitment issues with that 7.8. Be prepared for mods. __________________ Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project *Tired of spark plugs? Check this out.*

12-28-2012, 11:45 PM	#4
leftybass209 Registered User Join Date: Feb 2011 Location: Modesto, CA Posts: 2,188	Re: Isuzu 6H / dmax lg4 7.8 swap I did a quick search on the duramax forums and turned up a few posts claiming the 7.8 was gutless. Its also really heavy, especially paired with that Allison. If unique is your thing, its an option. As far as you are with the 6.0 I'd just move forward. Better performance, fuel economy, and lighter weight. Unless you plan on towing or hauling really heavy loads uphill to utilize the 500+ lbs ft of torque, I don't see the 7.8 paying off with little more than a headache. Posted via Mobile Device

12-30-2012, 06:26 PM	#6
Bob B. Senior Member Join Date: Aug 2005 Location: Los Angeles Posts: 1,327	Re: Isuzu 6H / dmax lg4 7.8 swap The 6H is very reliable, and some versions had decent power (300/860), but it is a large heavy engine. Much bigger than a Cummins B, about the size of a Cat C-7. Not a good swap choice for a pickup if you ask me. __________________ 1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.



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