Good or bad idea, 2000 6,0+4L80 in 1990 Suburban - The 1947 - Present Chevrolet & GMC Truck Message Board Network

rack · 01-07-2026, 01:02 PM

Hello all,

Have not been around for a long time.

I have 1990 Suburban 2500 4x4, imported from USA in 2012 (I am in Bulgaria). It is my looong term project sitting in garage :-)

I have had idea to swap TH400 with 4L80 but never got there.

Now, I might have opportunity to buy donor 2000 GMC Yukon 2500, 4x4, with Vortec 6.0 and 4L80 combo here, for the price of rebuilt 4L80 imported from USA.

I am thinking, is it good idea to swap engine and tranny in 1990 body?

I know it will involve a lot of cabling, moving ECU and so on.

I will appreciate your feedback.

Ivo

Shifty One · 01-07-2026, 03:59 PM

How will you address the transfer case?

rack · 01-08-2026, 01:36 AM

Hi Shifty One,

As far as I know, transfer case I currently have is direct bolt on to 4L80. I have NP241C with manual shift. I know that drive shafts have to be reworked.

Best regards,
Ivo

01-07-2026, 01:02 PM	#1
rack Registered User Join Date: Dec 2012 Location: Sofia, Bulgaria Posts: 31	Good or bad idea, 2000 6,0+4L80 in 1990 Suburban Hello all, Have not been around for a long time. I have 1990 Suburban 2500 4x4, imported from USA in 2012 (I am in Bulgaria). It is my looong term project sitting in garage :-) I have had idea to swap TH400 with 4L80 but never got there. Now, I might have opportunity to buy donor 2000 GMC Yukon 2500, 4x4, with Vortec 6.0 and 4L80 combo here, for the price of rebuilt 4L80 imported from USA. I am thinking, is it good idea to swap engine and tranny in 1990 body? I know it will involve a lot of cabling, moving ECU and so on. I will appreciate your feedback. Ivo __________________ 2004 Chevy Monte Carlo SS Supercharged 1990 Chevy Suburban 350 TBI 1978 Chevy Monte Carlo 305,2bbl 1997 Hyundai Accent 1,3 1985 Trabant 601s 2-stork 600 ccm

01-07-2026, 03:59 PM	#2
Shifty One Registered User Join Date: Dec 2014 Location: Tucson, AZ Posts: 970	Re: Good or bad idea, 2000 6,0+4L80 in 1990 Suburban How will you address the transfer case? __________________ 1987 V20 farm-hand rescue 1998 C2500 lot-rot rescue

01-08-2026, 01:36 AM	#3
rack Registered User Join Date: Dec 2012 Location: Sofia, Bulgaria Posts: 31	Re: Good or bad idea, 2000 6,0+4L80 in 1990 Suburban Hi Shifty One, As far as I know, transfer case I currently have is direct bolt on to 4L80. I have NP241C with manual shift. I know that drive shafts have to be reworked. Best regards, Ivo __________________ 2004 Chevy Monte Carlo SS Supercharged 1990 Chevy Suburban 350 TBI 1978 Chevy Monte Carlo 305,2bbl 1997 Hyundai Accent 1,3 1985 Trabant 601s 2-stork 600 ccm



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