63Willys

Hey All,

Looking for some help identifying the 4.8 I have. I am told it came from a 2012 U-Haul van/truck. I do not have any harness, PCM or DBW pedal. I have found a couple of numbers engraved on the heads and the block/head casting numbers but I can't find anything that resembles a vin number from the donor vehicle. Is there any vin or derivative of a vin on the motor? If so, where would I find it?

Thanks,

Lane

63Willys

So here are some pictures of what numbers I can find.

Untitled by Lane Bauer, on Flickr

Untitled by Lane Bauer, on Flickr

Untitled by Lane Bauer, on Flickr

Untitled by Lane Bauer, on Flickr

Untitled by Lane Bauer, on Flickr

Fasttest

If you can see the crank on the fly wheel side it'll say it there

JoeNova

There are only 2 Gen 4 4.8s. The LY2 and the L20.
Seeing as how this has 862 heads, its an L20.

63Willys

Here's a couple of pics. The only number I can find is what I know to be a casting number. Thoughts?

Untitled by Lane Bauer, on Flickr

Untitled by Lane Bauer, on Flickr

Untitled by Lane Bauer, on Flickr

Untitled by Lane Bauer, on Flickr

Untitled by Lane Bauer, on Flickr

Untitled by Lane Bauer, on Flickr

Untitled by Lane Bauer, on Flickr

63Willys

How do I confirm even that what I have is a Gen IV, weren't the 862 heads widely used over many years?

63Willys

According to the casting number 12567392 it is an LM7/LR4. Does this differ from the L20? Bear with the rookie questions, I am just that

JoeNova

Gen 3 stopped production in 07. Anything 08 and up is gen 4.

Take a picture of the timing cover and valley cover under intake. Eaisest way to determine between gen 3 and 4.

63Willys

Can't get to the timing cover quickly but here is the valley plate....

Untitled by Lane Bauer, on Flickr

Untitled by Lane Bauer, on Flickr

JoeNova

It's a gen 3. 99-07. LR4 if it's a 4.8, LM7 if it's a 5.3. Best case, it's the flex fuel version of one of those.

63Willys

Thank you! Do you have a picture of a Gen IV so I can see what the difference is?

Next question.... I do not have any harness or DBW pedal, any sources other than wrecking yard or car-parts? Will a basic silverado/sierra harness from same year span work?

EDIT.... I am finding several option available for 03-06 Silverado/Sierrra, is it safe to assume these will work?

JoeNova

The difference is that valley cover. Those round rubber plugs have the knock sensors below them. In the gen 4 blocks, the knock sensors are in the sides of the block, not on top.

63Willys

Thank you for telling me the difference!

1FastBrick

iTrader: (16)

That's a 4.8. Notice the little spacer on the back of the crank. It would have had a flat flywheel and been bolted to a 4L80E transmission in a van application.

The Vans did not have flex fuel.

JoeNova

I don't think any of this has to be true, considering its an older gen 3 in a 2012 vehicle.

They could have very well put an LM7 into it, and you use the exact same spacer and flat flexplate mating a 5.3 to a 4L80e.

You'll have to pull the pan and look for crank or rod casting numbers To determine either 4.8 or 5.3.

1FastBrick

iTrader: (16)

I don't believe they put the 5.3L with a 4L80E in a 1/2 ton Van which was the only way the originally sold the 5.3L in the van.

The 3/4 tons are usually 4.8's or 6.0's

An L20 would have active fuel management which would make it a gen4 block.

AWD in a 4 speed would be likely be a 60E style transmission as well.

I bet that came from an 07 or older vehicle... The date code is cast on the Pass side of the block near the water pump. would also be cast into the heads under the valve cover area where the rockers are.

Although I have seen a 2001 that was a LU3 4.3L V6 in a 2500 chassis... Lucky for me they left the 4L80e alone as a result...

63Willys

Thanks for the leads om where to look. I am working my way there. Probably pulling valve covers and the rest of the accessories this weekend.

63Willys

Untitled by Lane Bauer, on Flickr

Untitled by Lane Bauer, on Flickr

I talked with Josh at Team 208 Motorsports today and he told me that the 8 pin plug for the DBW on the throttle body says it's a 2003-2006 era motor. Do ya'll agree with this?

1FastBrick

iTrader: (16)

I believe that is correct.

The vans how ever used a cable style TB up until around 08-09. they switched to electric but i have not worked on one and am unsure what they switched too

FYI The plastic rails in the back round are non flex fuel style rails.

63Willys

Thank you very much! I was told it came form a U-Haul moving van, assuming an express type of van. So does this lead you to think maybe not?