I think I'll be following this thread for some time. I have an '88 GMC Suburban with 352,000+ on the original 350. At least I think it's the original engine. I bought it from a maintenance fanatic retired Air Force pilot with 98k on the clock. I've never changed the engine but am almost as fanatical as he was when it comes to fluids and filters. The 'Burb has the 700R4 and is just now starting to smoke (white smoke) on engine start. I assume that is from valve stem oil seals.

This 'Burb is a 1/2 ton so would be a long distance freeway traveler. My 4WD toy is a 1984 Grand Wagoneer. The 'Burb gets excellent mileage for a truck so old. With 41 psi tire pressure and 60 mph, it gets 19.6 to 23.2 mpg.

The Grand Wagoneer is lucky to get 12-14 mpg.

I'm partial to the 6.2 or 6.5t with these older "burbans. Sooooo, what would be the feasebility and difficulty of dropping in one of the GM diesels? The 'Burb is in great body shape with no rust. All systems work fine and I love the room inside.

Semper Fi

 

Its very easy to drop a 6.2 or 6.5 in place of a chevy gasser. Get a 93 or older 6.5 or 6.2 the 6.2 will get better fuel mileage somewhere in the mid 20's the 6.5 will only do about 18. All the sensors hook up and the motor mounts and trans will bolt to it. You will need a diesel radiator, torque converter, and a solenoid to run the glow plugs. Then you pretty well just drop it in like any other bolt in. I have done this to a few trucks and it is easy.

 

Thanks, that's kinda what I thought. I'm not looking for a dragster here, just something that can get out of it's own way and cruise all day.

There's nothing quite like the old 'Burbs for travelling.

 

4L80E transmissions are used behind DURAMAX engines that are in van and ambulance chassis . these engines are 300+hp and 500+ft.lbs. The main thing with this transmission behind a cummins is to get a good billet converter .I know of a H1 with a cummins conversion using a 4L80E and this is a 350/400 hp engine built by Schied diesel
and this H1 weighs over 8000lbs.

 

i see you "resurrected" this thread today. and i was wondering if you know what was done to that 4l80e thats in the H1 and how long they have ran it for so far. im working on doing a swap and am considering using a built 4l80e over a nv4500. and how do they drive it? i have a heavy foot and usually find all weak points fairly soon....

 

The 4l80e in the H1 is a stock replacement transmission with a good billet converter. This transmissions WILL hold up to a mildly altered cummins.

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I am building a chevrolet cucv military 1 ton with a. 91 cummins mild performance engine with a 4l80e transmission. This truck will be used to plow snow and haul parts and be a work truck .

 

so nothing more then a converter in it. how hard to they drive it?

 

Well he doesn't drive it like he stole it but its not babied either. And let's not forget that the hummer weighs in at over 8500lbs. The engine has had some work done to it and is estimated to make around 350 to 400 hp .

 

thats great to know! has he ever done a boosted launch with it? i ummmm forget to step off the break some times.....

 

Howdy, I basically want to do the exact same thing as you, to my 97 3/4 ton... I have the NV transmission, what is that spline count on the input shaft? and where did you get the shaft, and the bellhousing from?