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#1 |
Registered User
Join Date: Jan 2005
Location: Hiles, WI
Posts: 42
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Fan and fan clutch
I have a 71 GMC 3/4 ton 4X4 I want to change the stock 4 blade fan for a 7 blade with a clutch. Can some one tell me which model and year vehicles have a set up that will work on my truck. I plan to go to a junk yard to get it. Thanks in advance.
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#2 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,500
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Suburban big blocks in the 87-91 range
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#3 |
Registered User
Join Date: Jan 2005
Location: Hiles, WI
Posts: 42
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Thank's kwmech, is that all my choices? I read somewhere a 71 monte carlo will work or is that bad info?
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#4 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Tully, welcome to the board..where do you call home?
Some of this will depend on what style pump you have. The bolt patern on short pumps (stock on these trucks) was not the same as the long pumps. However, many replacement pumps will have both bolt paterns on the hub so they can use the same part on either pump. If you have a short pump, and it has the single bolt patern, then you'll be stuck with getting the part off a 69 or older car, or 72 and older truck...problem is, not many of either were sold with fan clutches. So this means parts store, and you'll pay through the nose from what I understand. If you have a long pump, or a dual pattern hub, then you can grab the fan/clutch off of any GM rear wheel drive vehicle up untill the serp belt came in to play, which would have a reverse rotation pump, so that fan would blow air through the rad instead of sucking the cool outside air. |
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#5 |
Registered User
Join Date: Jan 2005
Location: Hiles, WI
Posts: 42
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Thanks longhorn man. Home is in NE WI
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#6 |
Registered User
Join Date: Jan 2005
Location: Hiles, WI
Posts: 42
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I was a little slow digesting the info from longhorn man. Will the difference between the short and long style water pumps be enough to mess with the fan being half in the shroud? Also while on this subject what's the difference between 2 and 4 wheel drive setups, with the shrouds being twice as deep on the 4X4's.
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#7 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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4X4 trucks had the engine set back a few extra inches. This is the same location that the inline engines were installed too...but that doesn't matter for this conversation.
If a long pump is installed on an otherwise stockl truck, then the fan will be in the shroud about 2 inches further than needed. |
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#8 |
Senior Member
![]() Join Date: Mar 2003
Location: Colfax-California
Posts: 8,500
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There may be more , but I know that the Suburban is a definate shoe in for a 7 blade.
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#9 |
Registered User
Join Date: Nov 2004
Location: "Under Montana skies."
Posts: 1,836
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NAPA had US made fan clutches for my 71 for $30-$35. I can't remember, exactly. The seven blade fan costs $100 at the dealer! Same with Classic Industries.
__________________
'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup. |
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#10 |
Registered User
Join Date: Jan 2005
Location: Hiles, WI
Posts: 42
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Thanks a lot guys, thats just what I needed to know!
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