5.3 or 6.0 swap into a pre-91 1 ton dually? - Pirate4x4.Com : 4x4 and Off-Road Forum
 
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Old 02-11-2008, 08:03 PM   #1 (permalink)
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5.3 or 6.0 swap into a pre-91 1 ton dually?

Did a search and could not find any body building a early model tow rig with a late model gen III motor in it.

Ok so I have been talking to a guy about buying a 77 1 ton 4x4 single cab dually. I have been looking for one of thies trucks for quite some but just havent found the right deal till know. Any way the truck will be my tow rig/shop rig/DD in the winter. It will probably never pull over 10000 lbs farther than across town, but dont want it strugling to pull my jeep and buggy at the same time to texas.

my plan is to do a 6"/shaclkle flip with high steer, 40x11x20 military tires, 203/205 and probably 4.56 gears,4l80e, gen III swap. Then a basic resto wuth paint and int.

My question is should I run a 5.3 or 6.0? I am mainly conserned about MPG. I know I will never get great gas milage but I would atleast like to get over 15mpg. I will remove all the smog and have the PCM flashed a reprogramed to open up the motor a little. I will also be running hi-flow air filter and deasent exhaust.

which do you think I will be happiest with?

If you have done the swap in a rig like I am building please post your experiance. do's and dont's along with any regrets.
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Old 02-11-2008, 09:43 PM   #2 (permalink)
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I liked driving a 6.0 over a 5.3. Never did really heavy pulling with the 5.3. Every time I did pull with the 5.3 I wished I had a 6.0.
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Old 02-12-2008, 06:57 AM   #3 (permalink)
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Get the 6.0L the 4l80e will eat alot of the 5.3Ls power unless you run a supercharger.
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Old 02-12-2008, 08:35 AM   #4 (permalink)
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I'm in the process of swapping a 2000 6.0/4L80E combo from a 2500 HD into my 1986 C-30 crew cab dually...











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Old 02-12-2008, 09:28 AM   #5 (permalink)
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Are you stuck on the 6" lift and 40" tires? Those are what I could see that would be your main hurdle for getting 15mpg empty - making a non-aerodynamic truck even less aerodynamic.
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Old 02-12-2008, 11:41 AM   #6 (permalink)
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The new all aluminum 6.0s have the cylinder shutdown, just a thought if your worried about gas milage.
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Old 02-12-2008, 11:45 AM   #7 (permalink)
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No I'm not stuck on that lift tire combo and the more I think about it I am leaning too not lift 265/75R16. Being that this will be a shop truck for our off road shop I have to find some thing to make it stand out in town. I guess only time will tell.

TatorZuk do you have any more detailed pictures, also when do you think you will have it driving?
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Old 02-12-2008, 12:14 PM   #8 (permalink)
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Are you stuck on the 6.0 (I would not consider the 5.3 in your case either)? Any thoughts of Cummins 6BT? Or, are you wanting to go new school with the newer engine choices like the 6.0? I was also thinking about a 454 or 502 crate engine with F.I. added into the mix. And, if not a crate engine then a aftermarket F.I equipped, decent headed, roller cam equipped 454 or 502?
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Old 02-12-2008, 01:30 PM   #9 (permalink)
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No I realy dont want to swap in a diesel. I know it would tow better and get more fuel milage but the Gen III motors just have a cool factor to them.
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Old 02-12-2008, 02:09 PM   #10 (permalink)
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I would go with the chevy 8.1. It will get decent mileage and have a ton of power.
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Old 02-12-2008, 02:19 PM   #11 (permalink)
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Well I thought about the 8.1, but I am afraid that it will suck to much gas for DD. I have no dought that it will to better and have more power but is the added power and towing capacity worth the gas money.
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Old 02-12-2008, 02:21 PM   #12 (permalink)
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Everyone I know with a 6.0 in a 3/4 ton truck averages around 12-13 stock. The 8.1s are very similar, but get better mileage loaded. Also if you are thinking about a lifted truck the torque of the 8.1 would probably be better than the 6.0
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Old 02-12-2008, 02:37 PM   #13 (permalink)
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Hey everybody, Im new to being registered even though I have been lurking for a while. I think you can forget 15 mpg with 38 - 40's. I use to sell Hummers which have the 6.0 in them and 12 mpg was good gas mileage for them. I think once you put that engine in a older box with low gears and big tires you will be lucky to get 10 mpg. Also I saw someone mention a supercharger if you put a supercharger in it you will have to run high octane fuel but you will get lots more power. Just some things to keep in mind.
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Old 02-12-2008, 02:46 PM   #14 (permalink)
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^^^ my thoughts too. I think the 6.0 with those tires and lift (I know you may have rethought your goal) would be working more often (vs. the 8.1 or a 6BT) as a DD and return poor mileage. As far as the cool factor...that'll only be while the hood is up.. I know you're passing on the diesel...but that sucker would tow, DD, and return very decent mileage...sounds perfect for what it seems you are wanting....I know it is a rather common run O'the mill swap...but just thought I'd toss it out there...?
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Old 02-12-2008, 03:09 PM   #15 (permalink)
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One thing to add, The computer that I will put in the truck will be reprogramed with all the smog and factory detuned crap gone. I think with the engine opened up like that it will get much better milage than a factory engine.
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Old 02-12-2008, 07:13 PM   #16 (permalink)
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One thing to add, The computer that I will put in the truck will be reprogramed with all the smog and factory detuned crap gone. I think with the engine opened up like that it will get much better milage than a factory engine.
I think 15mpg unloaded is with in reason if you ditched the 40's. The 4l80 doesn't have as good an over drive either. Stick with 4:10's and 33''. Since its a tow rig I think stability of the smaller tire would help better than the bling factor of 40's!

Whats your budget BTW?

Contact S&P in Mena,AR they done several Gen III swaps in that body style truck.

http://www.hotrodlane.cc/

Also, PM me if you need any help during the swap. I live in Beebe, AR I can give you a hand and answer any questions. I have done several Gen III swaps.

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Old 02-12-2008, 07:36 PM   #17 (permalink)
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TatorZuk do you have any more detailed pictures, also when do you think you will have it driving?
I've got lots of detailed pics...let me know what you want to see.

Here's the right side motor mount as far foward as you can get it with the factory AC setup...



I don't know when I'll finish it...hopefully in a 3-4 weeks...I only work on it a little on the weekends.
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Old 02-13-2008, 06:20 AM   #18 (permalink)
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Contact S&P in Mena,AR they done several Gen III swaps in that body style truck.

I use Fuel Injection Specialties from El Paso Texas. I have done several 5.3's in wranglers but never in a 1 ton.
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Old 02-13-2008, 06:52 AM   #19 (permalink)
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I would go 8.1 myself. That is a lot of truck, you will need deep gears with the 6.0 for good mileage. My 8.1 gets 12-14 around town commuting, upto 15 or a touch better highway and down to 8 towing... My 6.0 trucks have been in the 12-14 range even highway, and they won't tow 12+k trailers up the passes as well.

If you are hell bent on the SBC, I would at least go with a ZF-6 to try to improve the effeciency and provide some around town gears...

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Old 02-13-2008, 06:58 AM   #20 (permalink)
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I use Fuel Injection Specialties from El Paso Texas. I have done several 5.3's in wranglers but never in a 1 ton.
Shouldn't be any different.

The good thing is you can use an in tank pump because the later 80's body style had in tanks for TBI.

Label all the wires from the old motor. Then you can reconnect all the original gauge senders and remove everything else not needed.

But S&P should have mounts for that body style already if you to cheap/lazy to make your own.
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Old 02-13-2008, 09:01 AM   #21 (permalink)
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One question that I haven't seen asked or addressed yet is why do you think you need a 203/205 doubler in a shop/tow/DD truck? That seems like a waste to me that will likely never get used. I say pick one or the other (my choice would be 205) for this truck, but not both.

Also think about a loading/unloading stuff in the bed of this shop truck with a 6" lift and 40's. It's going to be a pain in the ass. Another reason to consider running no lift and "normal" sized tires.
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Old 02-13-2008, 09:08 AM   #22 (permalink)
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I would go 8.1 myself. That is a lot of truck, you will need deep gears with the 6.0 for good mileage. My 8.1 gets 12-14 around town commuting, upto 15 or a touch better highway and down to 8 towing... My 6.0 trucks have been in the 12-14 range even highway, and they won't tow 12+k trailers up the passes as well.

If you are hell bent on the SBC, I would at least go with a ZF-6 to try to improve the effeciency and provide some around town gears...

Sorry, not to hijack this thread, but it looks like the trailer loading is a little bassackwards.
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Old 02-13-2008, 09:53 AM   #23 (permalink)
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Sorry, not to hijack this thread, but it looks like the trailer loading is a little bassackwards.
Why? How would you load it? The Dodge is very front axle heavy, tongue weight like that is about 1500 lb, which considering a 13k lb trailer, is about perfect. Pulls great, no trailer sway, unloading of the vehicle, brakes are good...


Its tougher with the bigger 2nd truck and a SRW tow rig: I estimate we had about 2000 lb on the 2500 HD here. Cranked the hitch up but it still wandered a tad on the highway (likely due to the sway bars being so tight)



Behind a dually two fullsizes is no problem, even with the Dodge loaded forward.
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Old 02-13-2008, 11:45 AM   #24 (permalink)
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One question that I haven't seen asked or addressed yet is why do you think you need a 203/205 doubler in a shop/tow/DD truck? That seems like a waste to me that will likely never get used. I say pick one or the other (my choice would be 205) for this truck, but not both.

Also think about a loading/unloading stuff in the bed of this shop truck with a 6" lift and 40's. It's going to be a pain in the ass. Another reason to consider running no lift and "normal" sized tires.

Our shop is 5 miles from Superlift ORV and I have to do vehicle extraction a lot. and I think I have completely changed the build after the discusion I had with my boss today at lunch. probably going to go 6BT/4500/203/205 with 3.73's and 285's with no lift.
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Old 02-13-2008, 12:06 PM   #25 (permalink)
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That sounds pretty sweet. With the diesel, could even step up a little more tire size and not feel too much pain..... I like the old style Chevy.
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