I have the option to purchase a 6.2 l diesel engine for some short money. the engine runs well and I also have a spare parts motor for it. I was wondering if I would be able to install it into my 95 gmc 3500. It currently has a 5.7 ltr gas engine in it. I am just not sure if the new diesel will fit my motor mounts and tranny.


Any help would be great.

You will most likely have to change mounts, exhaust , transmission should bolt up, but you might have to change controler or computer if it has one. I'm sure there is some internet links for this change. I do remember seeing a guy post that he put a 6.2 in his Corvette.

6.2 in his corvette??????? what was he thinking??http://www.dieselplace.com/forum/smileys/Dead.gif

I installed a 1984 6.2L engine from a 1984 G20 van in my 1986 C30 dually that had a 5.7 gas engine. I had to redo the engine electrical since a diesel has more electrical components. I didn't have to change the engine mounts, but if you do it should not be a problem.


I used the ignition wire for the fuel injector pump switch. I installed separate wires for the fast idle, injection pump advance, fuel filter heater, and glow plug solenoid. I bypassed the glow plug controller in the left head and connected a new wire thru the coolant temp. sensor in the right head to a stater solenoid (from a Ford Pinto) on the right upper firewall. I then spliced in a wiring harness for the glow plugs. I put the new toggle switches in a panel on the lower left of my dash. I put the glow plug solenoid on a toggle switch that is spring loaded to off so that the glow plugs can not be switched on accidentally. And you need to remember that the injection pump advance switch should not stay on very long as it does advance your timing by 5 degrees.


I like the manual contol for my glow plugs and since I run the wire thru the coolant sensor in the right head then I can't activate the solenoid to turn on the glows plugs when the engine is warm enough. I went manual when the glow plug controller failed an the replacement cost was $135 and the Chev parts man said they failed often.

I forgot to mention that the 6.2L matched up to my 3 speed manual, but I stopped using the roller bearing pilot bearing as they fail often. I now use the standard 5.7 pilot bearing. I first used the engine in my 1970 C20 pickup that had the turbo 350 automatic transmission and it fit up fine. Since my radiator didn't have the oil cooler for the engine then I installed an air cooled oil radiator in front of the engine radiator. When I transferred the engine to my 1986 C30 then I bought the diesel radiator instead of using the air cooled one. I don't know which radiator does the best job of cooling the oil.

use cougarjohn's advice for all your engine wiring it sounds excellent. As far as the transmision goes since your truck is a 95 it will be the computer controlled transmision. You will find that if you take out the gas engine the computer becomes confused and defaults the transmision to 3rd gear. You have a couple of options to get around this: Either buy an aftermarket transmision controller, they're about $1000. Or if you're like me and consistently broke you could use a switch to change gears.

I have outlined how I did this in a post under the 6.5L Diesel section, the post is: ditch the electronics go mechanical.

I think you'll be happy with the swap after its all said and done, I just went from a 350 to a 6.5 naturally aspirated and during a 1000 mile trip this weekend I averaged about 27mpg (thats imperial gallons folks) with the old gasser I could never even dream of mileage like this.

best bet is a non computerized 6.5 td with a mechanical injector pump. you keep the 4L80E happy and dont have to worry bout 6.2 lack of power