motor swap

Asked by Jun 23, 2016 at 10:08 PM about the 1998 GMC Sierra 1500 K1500 SLE 4WD Extended Cab SB

Question type: Car Customization

I'm looking at replacing the vortec 350 in my truck with a 6.5 turbo diesel. I don't need hate on my motor of choice, It's perfect for what I'm doing. My question is do I need my computer replaced (or flashed) for it to run with my current setup or can I just swap the wiring harness?

7 Answers

49,325

Replacing a 350 gasoline engine with a diesel will require major modifications. Electronics, transmission, fuel system, exhaust and possibly suspension will all have to be modified or replaced. I would just look for another vehicle.

12,635

Find a GMC with the 6.5 turbo diesel buy it as a parts vehicle then change over the engine and all systems to your '98, This is the easiest method.

26,115

2 good answers....but why is my question....

I have been building this truck from the ground up, I got the diesel out of a 94 silverado and had it rebuild and upgraded to work with the 98. Basically everything's been done but the electronics up on the motor. I have the new harness, only thing I don't have is the computer. I have the computer from the original 350, which leads me back to my question, can that be flashed or does it have to be replaced with one from a truck with a diesel?

The reason why kelly is that this project is something I started with a close family member who has since passed away. This has a huge amount of sentimental value to me so the extra cost and work are well worth it to me.

12,635

This requires the computer (Diesel) from the '94 Silverado.

I've upgraded the 6.5 to the late 90s specs. Updated heads, sensors, fuel system, and accessories. It's no longer compatible with the older computer. I know I can buy a computer for a 98 6.5 with my setup but it would have to be flashed by the dealership. I'm just wondering if I can have the computer I have for the 350 reprogrammed (flashed) to run the 6.5

Your Answer

Add photo

Related Questions

  • motor swap 7 answers

    I'm looking at replacing the vortec 350 in my truck with a 6.5 turbo diesel. I don't need hate on my motor of choice, It's perfect for what I'm doing. My question is do I need my computer replaced (or...

    1998 GMC Sierra 1500 K1500 SLE 4WD Extended Cab SB

    -

    Car Customization

  • Engine swap

    Will a 1992 Buick road master with a 5.7 Lt1 motor fit in a 1992 GMC Sierra with a 5.7? If so what all is involved in doing so?

    1992 GMC Sierra 1500

    -

    Car Customization

  • Looking for input on a V8 swap, stock heads or Vortec? 6 answers

    Hi, I own a 91 GMC Sierra 4WD Standard Cab Stepside with a 4.3 litre V6 and 5 speed transmission. I've put a lot of work into her already, as I do bodywork for a living. I plan on doing a V8 swap this...

    1991 GMC Sierra 1500 K1500 4WD Standard Cab Stepside SB

    -

    Car Customization

  • i have a 1995 gmc sierra 1500 2x4 i want to swap engine transmission and driveshaft and rear end and make it 4x4. what do you recommend? 7 answers

    would like to swap 1995 5.7 4x2 to a 5.7 4x4. i want to swap the transmission to a 4l80e for sure and add a transfer case of course to make it 4x4 i know it will cost some money but this is a projec...

    1995 GMC Sierra 1500 C1500 SLE Extended Cab Stepside SB

    -

    Car Customization

  • transmission swap ? 5 answers

    i have a 2000 gmc z71 sierra 1500 with 236000 miles and a 4L60E trans the truck shifts trough 1st 2nd and 3rd just fine but wont go any higher. is this a big expensive fix or something simple ,and i h...

    2000 GMC Sierra 1500 SLT Extended Cab Stepside SB

    -

    Car Customization

Sierra 1500

Looking for a Used Sierra 1500 in your area?

CarGurus has 68,507 nationwide Sierra 1500 listings starting at $1,800.

ZIP:

Search GMC Sierra 1500 Questions

GMC Sierra 1500 Experts

#1 dragonflyoffshore
dragonflyoffshore
Reputation 5,260
#2 John Saffrahn
John Saffrahn
Reputation 3,640
#3 Glenn Clingenpeel
Glenn Clingenpeel
Reputation 3,330
View All

Related Models For Sale

Used Chevrolet Silverado 1500
1,919 Great Deals out of 182,759 listings starting at $1,495
Used Ford F-150
2,127 Great Deals out of 193,349 listings starting at $290
Used Dodge Ram 1500
403 Great Deals out of 10,928 listings starting at $1,000
Used Toyota Tacoma
531 Great Deals out of 42,958 listings starting at $1,995
Used GMC Yukon
405 Great Deals out of 20,427 listings starting at $1,495
Used Chevrolet Tahoe
584 Great Deals out of 32,918 listings starting at $1,500
Used Ford F-250 Super Duty
334 Great Deals out of 44,361 listings starting at $1,450
Used Chevrolet Camaro
354 Great Deals out of 31,326 listings starting at $2,200

Used Cars For Sale

2017 GMC Sierra 1500 For Sale
81 Great Deals out of 44,075 listings starting at $23,368
2016 GMC Sierra 1500 For Sale
88 Great Deals out of 3,511 listings starting at $17,670
2015 GMC Sierra 1500 For Sale
93 Great Deals out of 4,281 listings starting at $16,291
2014 GMC Sierra 1500 For Sale
93 Great Deals out of 4,195 listings starting at $13,995
2013 GMC Sierra 1500 For Sale
55 Great Deals out of 1,944 listings starting at $8,999

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.