Alternative alternator bracket? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

71C10Guy · 02-23-2020, 08:52 PM

I have to stock 2 piece alternator bracket, and it's a total pain in the ass. The long top provides almost no support and the alternator ends up vibrating violently. I've been driving with it for a year now so it's not an emergency, but it pisses me off. Another thing, the bracket is not long enough to completely clear my valve covers, so the alternator rests on the side of the cover. When it vibrates it makes a loud metallic clanking noise that... is less than ideal.
I'm just wondering if anyone has had this problem and what they did to solve it? On another note, I added an aluminum bracket (piece of 1/8" sheet, bent and twisted) to the back of the alternator extending to the #1 cylinder exhaust bolt. It helps a tiny bit but not enough to make the alternator stop vibrating and rattling against my cover. Will include pics later.

Mike C · 02-23-2020, 09:06 PM

Interesting. I have 350,000 miles on my Jimmy OEM alternator setup and it is rock solid. It's the same setup used on C3 Corvettes from 69-82 and had no issue with the SHP motors that would pull nearly 7000 rpm with the 70 LT-1.

I would start trouble shooting to figure out what is wrong with your setup and correct that before re-inventing the wheel. Whether the bracket is broken, misaligned or something else going on.

GASoline71 · 02-23-2020, 09:23 PM

I have the stock alternator brackets on my 1972 with a stock alternator. It works just fine with no wonky vibrations. You need a bit longer fan belt if the alternator won't swing out far enough to clear the valve covers.

Gary

Andy4639 · 02-23-2020, 09:32 PM

Is this a small water pump setup are long water pump? The tall valve covers will not let the factory brackets fit right. You will need to make adjustments for them.
Pictures would help.

**uncle** · 02-23-2020, 10:10 PM

There are 2 different length upper brackets also which might help with valve cover problem.

**Grumpy old man** · 02-23-2020, 10:31 PM

Here are the 2 different upper brackets .

**StingRay** · 02-24-2020, 09:44 AM

I'll ditto the no problems With mine. On n my old 72 with stock brackets it always been rock solid and I run a modern 105 on it with significantly higher loading than stock. A couple hundred thou on the old girl. Perhaps send us a pic of your set up.

Andy4639 · 02-24-2020, 11:39 AM

Is this your type of setup?

Bearhawg · 01-13-2021, 09:31 AM

My apologies for resurrecting and old thread but this is the best result from my searching. I am looking for the bracket shown in my picture that looks to match up with the ones in thread. Can anyone tell me where i can find one to purchase? I dont need the lower cast bracket that bolts to the head, just the upper adjuster bracket. I've searched the interweb and the closest match seems to be from a C2 Corvette, which makes it more expensive.
Thanks for your help.
Name: IMG_0842.jpg
Views: 735
Size: 81.3 KB

Name: IMG_0842.jpg
Views: 735
Size: 81.3 KB

Andy4639 · 01-13-2021, 11:13 AM

Quote:

Originally Posted by Bearhawg

My apologies for resurrecting and old thread but this is the best result from my searching. I am looking for the bracket shown in my picture that looks to match up with the ones in thread. Can anyone tell me where i can find one to purchase? I dont need the lower cast bracket that bolts to the head, just the upper adjuster bracket. I've searched the interweb and the closest match seems to be from a C2 Corvette, which makes it more expensive.
Thanks for your help.
Attachment 2073901

I have bought them at the parts store but they are chrome. I just paint over it. Easy enough.

https://www.google.com/search?q=c+10...w=1366&bih=625

https://www.cjponyparts.com/alternat...1966/p/ALTB49/

https://www.classicparts.com/1963-66...gaAmSuEALw_wcB

https://www.speedwaymotors.com/Chrom...UaAkWNEALw_wcB

OL SKOOL · 01-13-2021, 12:43 PM

Put this in the parts section as a wtb. I bought the same one off there worked good and reasonable.

**70STOVEBOLT** · 01-13-2021, 04:36 PM

Quote:

Originally Posted by OL SKOOL

Put this in the parts section as a wtb. I bought the same one off there worked good and reasonable.

Gotta be a subscribing member to post on the parts boards.

Bearhawg · 01-14-2021, 08:29 AM

Quote:

Originally Posted by Andy4639

I have bought them at the parts store but they are chrome. I just paint over it. Easy enough.

https://www.google.com/search?q=c+10...w=1366&bih=625

https://www.cjponyparts.com/alternat...1966/p/ALTB49/

https://www.classicparts.com/1963-66...gaAmSuEALw_wcB

https://www.speedwaymotors.com/Chrom...UaAkWNEALw_wcB

Thanks! Purchased from Classic Parts

02-23-2020, 09:06 PM	#2
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,724	Re: Alternative alternator bracket? Interesting. I have 350,000 miles on my Jimmy OEM alternator setup and it is rock solid. It's the same setup used on C3 Corvettes from 69-82 and had no issue with the SHP motors that would pull nearly 7000 rpm with the 70 LT-1. I would start trouble shooting to figure out what is wrong with your setup and correct that before re-inventing the wheel. Whether the bracket is broken, misaligned or something else going on. __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

02-23-2020, 09:32 PM	#4
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Alternative alternator bracket? Is this a small water pump setup are long water pump? The tall valve covers will not let the factory brackets fit right. You will need to make adjustments for them. Pictures would help. __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

02-23-2020, 10:10 PM	#5
uncle Senior Member Join Date: Aug 2003 Location: Conyers,Ga. Posts: 7,288	Re: Alternative alternator bracket? There are 2 different length upper brackets also which might help with valve cover problem.

02-23-2020, 10:31 PM	#6
Grumpy old man Senior Member Join Date: Dec 2013 Location: Gods country East,Tn Posts: 8,545	Re: Alternative alternator bracket? Here are the 2 different upper brackets . Attached Images __________________ 1967 Factory short bed - Old school '71 - 350 / 4bolt / 487 heads / Edelbrock C3BX Muncie M-22 4 speed / Hurst Comp plus Factory 12 bolt posi 3.73 / 255-70-15 Smoothed firewall / Factory cowl induction Power disc brakes / power steering / 3.5-5" drop

02-24-2020, 09:44 AM	#7
StingRay Senior Member Join Date: Mar 2000 Location: Saskatoon,SK,Canada Posts: 2,476	Re: Alternative alternator bracket? I'll ditto the no problems With mine. On n my old 72 with stock brackets it always been rock solid and I run a modern 105 on it with significantly higher loading than stock. A couple hundred thou on the old girl. Perhaps send us a pic of your set up. __________________ Saskatoon, Saskatchewan Canada

02-23-2020, 08:52 PM	#1
71C10Guy Registered User Join Date: Jul 2017 Location: Dripping Springs Posts: 40	Alternative alternator bracket? I have to stock 2 piece alternator bracket, and it's a total pain in the ass. The long top provides almost no support and the alternator ends up vibrating violently. I've been driving with it for a year now so it's not an emergency, but it pisses me off. Another thing, the bracket is not long enough to completely clear my valve covers, so the alternator rests on the side of the cover. When it vibrates it makes a loud metallic clanking noise that... is less than ideal. I'm just wondering if anyone has had this problem and what they did to solve it? On another note, I added an aluminum bracket (piece of 1/8" sheet, bent and twisted) to the back of the alternator extending to the #1 cylinder exhaust bolt. It helps a tiny bit but not enough to make the alternator stop vibrating and rattling against my cover. Will include pics later.

02-24-2020, 11:39 AM	#8
Andy4639 Old member Join Date: Jan 2002 Location: Liberty, & Garden City S.C. , U.S. Posts: 19,945	Re: Alternative alternator bracket? Is this your type of setup? Attached Images __________________ 1971 LWB Custom, 6.0LS & 4L80E, Speedhut.com GPS speedometer & gauges with A/C. 20" Boss 338's Grey wheels 4 wheel disc brakes. My Driver Seeing the USA in a 71 Upstate SC GM Truck Club 2013,14 and 2016 Hot Rod Pour Tour http://upstategmtrucks.com/ Get out and drive the truck this summer and have some fun! It sucks not being able to hear! LWB trucks rule, if you don't think so measure your SWB! After talking to tech support at Air Lift I have found out that the kit I need is 60811. Per the measurements I gave them. Ride height of truck inside spring and inside diameter of springs.

01-13-2021, 09:31 AM	#9
Bearhawg Registered User Join Date: Feb 2018 Location: Snellville GA Posts: 104	Re: Alternative alternator bracket? My apologies for resurrecting and old thread but this is the best result from my searching. I am looking for the bracket shown in my picture that looks to match up with the ones in thread. Can anyone tell me where i can find one to purchase? I dont need the lower cast bracket that bolts to the head, just the upper adjuster bracket. I've searched the interweb and the closest match seems to be from a C2 Corvette, which makes it more expensive. Thanks for your help.

01-13-2021, 12:43 PM	#11
OL SKOOL Registered User Join Date: Feb 2010 Location: rochelle il. Posts: 355	Re: Alternative alternator bracket? Put this in the parts section as a wtb. I bought the same one off there worked good and reasonable.



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