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Old 01-17-2020, 02:31 PM   #1
ohboy321
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4x4 Radiator Shroud Question

Did all 67-72 4x4 trucks have the 4x4 specific radiator shroud?

My 67 with a 327 currently has the shorter fan shroud. I haven't had any overheating issues in the few years I've owned it, but if it is supposed to have one I may work on doing that to prevent issues in the future.

When looking at my current shroud, I can see where having a deeper (by 3"?) one would work better.

Thanks,
Steve/NH
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Old 01-17-2020, 04:38 PM   #2
Stocker
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Re: 4x4 Radiator Shroud Question

Can't say for sure, but I bet they all came with the deeper shroud. For maximum efficiency, the fan blades should be right at the end of the shroud. I have read half-in and half-out is best, or just inside the end of the shroud. If yours is 3" away, it can't be pulling all its air through the radiator as it should.
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Old 01-20-2020, 09:59 AM   #3
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Re: 4x4 Radiator Shroud Question

The shroud and radiator are currently out of the truck, but it may be even more than 3 inches between the fan and the outside edge of the shroud.

I have read that the 4x4 motors were set back several inches compared to the 2WD trucks, which explains the different shrouds being used. So now I am thinking that all 4x4s would have used them.

My truck was made up from both 4x4 and 2WD trucks, so that would explain how it ended up with the shorter shroud.

As I mentioned, I haven't had any overheating issues yet, but I haven't sat in any long summer traffic backups or moved any heavy loads either.
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Old 01-22-2020, 10:58 PM   #4
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Re: 4x4 Radiator Shroud Question

the motor on 4x4s is farther back than 2x4s, so they do have a specific shroud just for 4x4s.
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Old 01-22-2020, 11:59 PM   #5
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Re: 4x4 Radiator Shroud Question

Here is the NOS one I put on my truck (showing sticker) - I can take a picture of the installed shroud (fan side) and check the distance on my '72 4x4.

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Old 01-23-2020, 03:00 PM   #6
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Re: 4x4 Radiator Shroud Question

Thanks for the picture of the label 646870SS, with the part number I did a little more research and that would be the correct shroud for my 67. I was able to verify it on GMPartsWiki here: http://www.gmpartswiki.com/getpage?pageid=21326 (starts at bottom of page).

Below is a picture of what I have now, and based on comments it is clear that I need the deeper shroud. One of the tabs is broken and I was going to repair it before putting it back in, but now I think the best thing to do is track down the OEM part.

Thanks to all for the help.
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1967 K10 327 Short Bed Stepside
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2006 JETTA Diesel
1995 Harley FLSTC
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Old 01-23-2020, 04:04 PM   #7
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Re: 4x4 Radiator Shroud Question

Quote:
Originally Posted by ohboy321 View Post
Below is a picture of what I have now, and based on comments it is clear that I need the deeper shroud.
Yep, you sure do..... that appears to be a shroud for a 2WD truck.

Have you considered also adding a clutch fan? Well worth it IMO. If you're interested you can search for more info, or if you like I can pass along a few details for you.
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Old 01-23-2020, 05:54 PM   #8
646870SS
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Re: 4x4 Radiator Shroud Question

Here are the pics of mine. It is an original 4x4 truck with the NOS fan shroud. The one photo looks deceiving - the fan is in the shroud about 3/4" total so it is tucked in but this way it draws air with all that room in the front - the fan being so far back - it doesn't stick out from shroud. Hope this helps. I am not running a clutch fan, just the original one and it stays very cool. It is an air conditioning truck as well. Also running the original fan spacer - I think it is an 1-3/4".



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Old 01-23-2020, 10:49 PM   #9
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Re: 4x4 Radiator Shroud Question

lmc sells them, if you were closer i got 2 extras, but shipping would kill the deal.
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Old 01-24-2020, 09:17 PM   #10
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Re: 4x4 Radiator Shroud Question

Those pictures are great 646870SS. I'm now surprised I haven't had any issues with overheating with the wrong shroud in place.

Stocker, no, I haven't considered a clutch fan for my truck, although I am familiar with the advantages. I have already media blasted and painted the one I have, so for now I will just concentrate on getting the correct shroud.

I'll be posting a WTB as soon.
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Old 01-27-2020, 12:40 PM   #11
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Re: 4x4 Radiator Shroud Question

I used a 4/4 shroud since my V8 is mounted in the 2WD straight 6/4x4 SBC location. My Derale 17118 18" 6-blade clutch fan fits perfectly. Shroud is LMC P/N 32-2826.
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Old 01-27-2020, 10:17 PM   #12
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Re: 4x4 Radiator Shroud Question

Quote:
Originally Posted by jamie72 View Post
lmc sells them, if you were closer i got 2 extras, but shipping would kill the deal.
How is the quality of the ones from LMC? I have an aftermarket from classic industries I donít really care for. Itís more of a hard fiberglass than plastic.
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Old 01-28-2020, 09:04 AM   #13
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Re: 4x4 Radiator Shroud Question

I'm happy with my LMC shroud. The mounting holes lined up well, and the plastic is rigid enough to keep it's shape.
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