Pre Duramax Diesels - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 10 (permalink) Old 07-14-2007, 02:15 AM Thread Starter
 
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Pre Duramax Diesels

Im looking to hunt a diesel down for my GMC and have no idea what the older diesels were like. What would be the best of the old diesel be for larger 4x4?

If you can recommend a diesel, what could be done to hop them up?



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post #2 of 10 (permalink) Old 07-14-2007, 04:48 AM
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Cummins swap.

some diesel stuff
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post #3 of 10 (permalink) Old 07-14-2007, 01:30 PM
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I'd ask some of the 6.5 guys what they think. I guess it depends on what you want to do with the truck.



dd does have a point about a cummins swap, though.
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post #4 of 10 (permalink) Old 07-14-2007, 07:56 PM Thread Starter
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mainly low speed stuff, rock crawling and the occasional mud bog. I dont need huge amounts of wheel speed but the low end torque would be nice.
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post #5 of 10 (permalink) Old 07-15-2007, 04:47 PM
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That particular truck would have come with a 6.2, but a 6.5 install would be rather easy and you can mod the engine with a little money and some effort. It wont be a smoker like a Cummins, but the 6.5 is a reliable engine if maintained properly. I pull a 7200# trailer with mine and dont have any compaints as of this moment except it isnt as strong as a Dmax.

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Tony

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05 IH 9400i with Cummins ISX pulling a lumber bunk trailer, stuck in a swamp somewhere in Indiana.

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post #6 of 10 (permalink) Old 07-17-2007, 02:47 PM
 
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i had a 97 chevy dually w/t 6.5TD and was really impressed how it held up it's defently not like my newer demax's but does a great job for what it is..
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post #7 of 10 (permalink) Old 09-11-2007, 01:34 AM
 
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well, if you're lookin for a really good engine, no offense to the 6.2 6.5's but in the last issue of Diesel power they put a 4BT(Cummins, B-series, 4 cylinder, turbo) into a bronco, and it made 400 horse and I don't know how much torque but probably enough while getting like 25 mpg's in town, I don't know how hard to get and put into the truck, just my opinion, but that's where i'd try to go
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post #8 of 10 (permalink) Old 09-11-2007, 03:36 AM
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The 4BT is a little small, but would have just the right amount of off idle TQ to get it done. He has really done some wild things to that truck. I would say a 6.5TD GM, 5.9 6BT Cummins or something along those lines. Early 6.5 is all mechanical, as are the 12V Cummins. He has a few choices at this point, but with a rock crawler, I would go 4BT, size weight ratio would be good for the most part.

Tony

2001 GMC 2500HD EC/LB, 4X4. A few go fast goodies. 540hp/1107tq Danville Dyno 11/09, Kennedy 40% injectors.

05 IH 9400i with Cummins ISX pulling a lumber bunk trailer, stuck in a swamp somewhere in Indiana.

Proud Veteran Served 6yrs Active Army From Germany, Kuwait and Bosnia to Ft. Hood and Ft. Knox
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post #9 of 10 (permalink) Old 09-12-2007, 01:43 AM
 
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6.5 can be reliable if maintained very strictly and treated nice. But we did see a fair amount of head gasket failures and wasted bearings at the chevy dealership i spun wrenches for. The cummins is a great engine that will take mistreatment better, lots of upgrades available, and just a good all around engine. Biggest drawback is it is long and heavy. 4bt is a good option as well, lighter and more compact, and with a little modification it can make plenty of low end torque. Check out 4btswaps.com for more info on this little motor. In the end it all comes down to how much work you want to do, personal prefernce, and how deep your pockets are. i don't know what the 6.5's are going for, but a 4bt can be had for around 1800 on ebay and i have found 6bt's for as low as 1500 running.
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post #10 of 10 (permalink) Old 09-13-2007, 12:06 AM
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the 6.5's and 6.2s really arent mod friendly, werent great motors but werent too bad. for diesels of that time, the 7.3's and 5.9's motor wise were much better.

1996 Gmc k2500 4x4 6.5 turbo diesel, with mods Blew the head gasket, put all new heads, valves, injecotrs gaskets etc on the truck only to get it together and find out it had no oil pressure, and sounded horrible (pry a spun bearing). SOLD
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