Crank pulley question ????? HELP - The 1947 - Present Chevrolet & GMC Truck Message Board Network

69 air cab · 02-02-2004, 09:50 PM

I have a 69 air cab with 350. Pulleys are not aligning with w hat I believe to be oem pulleys. Questions.........is the crank pully 2 or 3 grove on an air truck? Mine has 3 but maybe I only need the 2 grove........I am trying to take it back to original after years of rigging.

Rod · 02-03-2004, 01:20 AM

It' fairly common to see a 2 piece lower pulley set in 69. So a total of three grooves.... .. the single pulley is for he PS and the double is for ac and water pump+ alt . You need a double groove water pump also.

Rod · 02-03-2004, 01:21 AM

might as well post a pic

70ChevyLongbed · 02-03-2004, 07:18 PM

I had a similar problem and have a question about the pulleys in the picture. The one on the left looks like the long water pump crank pulley I took off of my 307 when I switched from the long pump to the short pump. Doesn't the water pump make a difference?

From what I learned on mine it does make a difference, but I wanted clarification cuz I ended up with chrome aftermarket pulleys.

J

**COBALT** · 02-03-2004, 08:57 PM

I believe (and I might be wrong) the long water pump didn't come out until later in the '70s. You should have a short water pump on that 350 if you're going to stock, which means you may have to check those OEM pulleys to make sure they're correct.

*rage'nrat638* · 02-03-2004, 09:06 PM

here's the picture that TX got .....this is what you won on e-bay or was it someone else.....DOHOO.....

69 air cab · 02-03-2004, 09:18 PM

Thanks guys. Hawaiian-J actually came by with pulleys and we think it's in the W/P pulley that is wrong. All others (crank, alt, P/S we believe will work.....so I'm off to get with a guy that had my old w/p pulley which is two groove and not the 3 grove like I have.........thanks to you all and a big thanks for Jason coming out in the cold to work through it............pretty cool temps for a Hawaiian. OH....I did not bid on any pulleys on ebay.........but maybe someone will feel sorry for me and ship to me.
Thanks again.

Rod · 02-03-2004, 10:19 PM

Lets zoom in a little... well lets see,.. the stamped part number is 3923898... how bout that ..ITS A 68-71 SB LOWER CRANK PULLEY HOW BOUT THAT.:p thats what my 71 Chevy dealer part books says it is. Oh and the one beside it in the pic I posted above is part number and stamped 3755820... also correct pic of a ps lower pulley for a SB... which is good from 63-72 v8.

Rod · 02-03-2004, 11:14 PM

This auction on ebay is over but never sold...$15 for a set of ps crank and wp pulleys... good deal as far I'm concerned... not positive about the crank pulley on this one... would need a number on it to verify. Maybe contact him.
http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEBWA%3AIT

70ChevyLongbed · 02-04-2004, 01:03 AM

Quote:

Originally posted by 69 air cab
...and a big thanks for Jason coming out in the cold to work through it............pretty cool temps for a Hawaiian.

It helps to be a little hot blooded...

I'm glad I could help!

rage'nrat638,

That's like the one he has, plus the add on for air.

Thanks!

LilTruckMan'69 · 06-19-2009, 09:19 PM

Quote:

Originally Posted by Rod

It' fairly common to see a 2 piece lower pulley set in 69. So a total of three grooves.... .. the single pulley is for he PS and the double is for ac and water pump+ alt . You need a double groove water pump also.

Is that correct? My truck has the single pulley turning water pump and alt.

The bigger daul groove piece turns the power steering.

Everything works, except that my little stamped steel one for wtr/alt is bent.

Now I deal w/ my friends offering me these 3 groove stamped ones that will not work for mine.

Not sure if i should look out for another one like I have or attempt to "upgrade" to a more common setup.

LONGHAIR · 06-19-2009, 09:23 PM

Noobie digging up a 5 year old thread....

**truckdude239** · 06-19-2009, 09:38 PM

wow i just read a 5 year old post

LilTruckMan'69 · 06-20-2009, 01:15 PM

Quote:

Originally Posted by LONGHAIR

Noobie digging up a 5 year old thread....

Quote:

Originally Posted by truckdude239

wow i just read a 5 year old post

Er...............Congrats?????????????????

Five year post or not, I could still use the info.

I've found a short water pump single groove pulley online. I'm thikin' this is what I need.

02-02-2004, 09:50 PM	#1
69 air cab Registered User Join Date: Oct 2003 Location: Maryville, TN Posts: 477	Crank pulley question ????? HELP I have a 69 air cab with 350. Pulleys are not aligning with w hat I believe to be oem pulleys. Questions.........is the crank pully 2 or 3 grove on an air truck? Mine has 3 but maybe I only need the 2 grove........I am trying to take it back to original after years of rigging.

02-03-2004, 01:20 AM	#2
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	It' fairly common to see a 2 piece lower pulley set in 69. So a total of three grooves.... .. the single pulley is for he PS and the double is for ac and water pump+ alt . You need a double groove water pump also. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

02-03-2004, 01:21 AM	#3
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	might as well post a pic Attached Images __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

02-03-2004, 07:18 PM	#4
70ChevyLongbed Howzit?!? Join Date: Jan 2003 Location: Maryville, TN Posts: 1,266	I had a similar problem and have a question about the pulleys in the picture. The one on the left looks like the long water pump crank pulley I took off of my 307 when I switched from the long pump to the short pump. Doesn't the water pump make a difference? From what I learned on mine it does make a difference, but I wanted clarification cuz I ended up with chrome aftermarket pulleys. J __________________ Jason Hawaiian-J 70 Longbed, 307, Edelbrock Carb 1404, Edelbrock Intake 2101, Dual Roller Timing chain and gears, 214/214 cam, Comp Roller Rockers, dual Flowmasters. 1999 Chevy Tahoe 2004 Mini Cooper S 71 BMW 2002 - Sold

02-03-2004, 08:57 PM	#5
COBALT Senior Member Join Date: Sep 2001 Location: Seattle, WA, USA Posts: 5,817	I believe (and I might be wrong) the long water pump didn't come out until later in the '70s. You should have a short water pump on that 350 if you're going to stock, which means you may have to check those OEM pulleys to make sure they're correct. __________________ '69 3/4 ton C20 2wd-350ci/TH400 '69 3/4 ton Custom 20 2wd-350ci/4sp Manual '99 2wd 5.7 Chevy Tahoe Seattle, WA.

02-03-2004, 09:06 PM	#6
rage'nrat638 Account Suspended Join Date: Mar 2003 Location: THE FALL GUY CHICAGO IL Posts: 5,883	here's the picture that TX got .....this is what you won on e-bay or was it someone else.....DOHOO..... Last edited by rage'nrat638; 02-03-2004 at 09:26 PM.

02-03-2004, 09:18 PM	#7
69 air cab Registered User Join Date: Oct 2003 Location: Maryville, TN Posts: 477	Thanks guys. Hawaiian-J actually came by with pulleys and we think it's in the W/P pulley that is wrong. All others (crank, alt, P/S we believe will work.....so I'm off to get with a guy that had my old w/p pulley which is two groove and not the 3 grove like I have.........thanks to you all and a big thanks for Jason coming out in the cold to work through it............pretty cool temps for a Hawaiian. OH....I did not bid on any pulleys on ebay.........but maybe someone will feel sorry for me and ship to me. Thanks again.

02-03-2004, 10:19 PM	#8
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Lets zoom in a little... well lets see,.. the stamped part number is 3923898... how bout that ..ITS A 68-71 SB LOWER CRANK PULLEY HOW BOUT THAT.:p thats what my 71 Chevy dealer part books says it is. Oh and the one beside it in the pic I posted above is part number and stamped 3755820... also correct pic of a ps lower pulley for a SB... which is good from 63-72 v8. Attached Images __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

02-03-2004, 11:14 PM	#9
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	This auction on ebay is over but never sold...$15 for a set of ps crank and wp pulleys... good deal as far I'm concerned... not positive about the crank pulley on this one... would need a number on it to verify. Maybe contact him. http://cgi.ebay.com/ebaymotors/ws/eB...K%3AMEBWA%3AIT __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

06-19-2009, 09:38 PM	#13
truckdude239 Senior Member Join Date: Sep 2005 Location: Lewisville, Nc Posts: 10,233	Re: Crank pulley question ????? HELP wow i just read a 5 year old post __________________ David fuller Ase Certified Mechanic Click here to help support our board!! 1971 Chevy c-10 under going a 4.8l LSx swap Build Thread http://67-72chevytrucks.com/vboard/s...d.php?t=421305 2007 Honda Accord my daily 145kmiles 2002 Honda Accord 4 door With 330k(sisters car) 2005 toyota Avalon 228k( brothers car) 2002 Sububran 5.3 245k 2000 Tahoe 5.3l 378 General manager for Marco's Carwash & lube



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