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73-87 Chevy _ GMC Trucks => Engine/Drivetrain => Topic started by: 78 Chevyrado on May 24, 2011, 08:29:19 pm

Title: Double groove Alt pulley
Post by: 78 Chevyrado on May 24, 2011, 08:29:19 pm

Is there any known pulleys I could swap over to my truck so I could have double belts on my alternator?  My truck has, A/C and Power Steering.

The load on my alt at idle is too much for the single belt I have now.

If I can't get a double pulley I'm thinking about switching over to a full serpintine setup.   I need a new PS pump, and A/C compressor anyway.

Title: Re: Double groove Alt pulley
Post by: 78 Chevyrado on May 24, 2011, 08:49:26 pm

Another question...  Whats the absolute BEST V-belt money can buy.   I want to try that before anything else.  I have a dayco belt now, and that's about the best I can find locally.

Title: Re: Double groove Alt pulley
Post by: DnStClr on May 24, 2011, 09:21:03 pm

Try a google search for "double belt pulley for 10si alternator" and see if that gets ya in the ball park.
I've always liked Gates v-belts.

Title: Re: Double groove Alt pulley
Post by: Blazin on May 24, 2011, 09:47:23 pm

I have a Delco / Motorola alternator that has a double V pulley on it. You might try at a place that installs police, and fire radios.

Title: Re: Double groove Alt pulley
Post by: 756man on May 24, 2011, 11:15:04 pm

Are you running a cogged belt ?  Gates cogged would be my choice.

Title: Re: Double groove Alt pulley
Post by: 1979C20 on May 25, 2011, 12:26:09 am

Would a higher amp alt help?

Title: Re: Double groove Alt pulley
Post by: 78 Chevyrado on May 25, 2011, 08:48:38 am

I don't have a problem finding a double pulley for the alt itself, It's just that I need a new pulley with the extra groove for the water pump and or crank pulley.

I've also been debating...  I wonder how the setup off of an '87 and up would do me?  It had v-belts on everything but the alternator, which had its own little serpintine belt. 



Right now I have a 140a Alt on there.   It does fine when the belt doesnt drag.  so right when I put a new belt on there, the volt gauge doesnt move at all anytime, but after I retighten it in a week or so, then after 3 or 4 weeks it starts slipping again.  Right now my belt is as tight as I want to go for fear or ruining the bearings in the alternator.


I forgot about gates belts.   my dad used to use only those, but they sure dont have them at any of the stores around here anymore.  I wonder why that is?  that's stupid.

Title: Re: Double groove Alt pulley
Post by: Grim 82 on May 25, 2011, 09:09:24 am

The last belts I bought were from NAPA and they are made by Gates.

Title: Re: Double groove Alt pulley
Post by: 78 Chevyrado on May 25, 2011, 09:16:00 am

I'll go find me a napa today then.  Thanks, well see how it goes.   ;D

Title: Re: Double groove Alt pulley
Post by: 78 Chevyrado on May 25, 2011, 09:45:36 am

I see now why I couldn't find Gates belts...  Napa has them listed as NAPA brand and I usually don't buy store brand stuff.  Only way to tell online they're from gates is to rear the warranty PDF.

Very good, I'll pick some up today and see what happens.

Title: Re: Double groove Alt pulley
Post by: 78 Chevyrado on May 26, 2011, 05:16:22 pm

So far, So good with the gates belts, I'll update this as time goes by.

Title: Re: Double groove Alt pulley
Post by: slammed79 on May 26, 2011, 07:27:02 pm

I've always like gates or the Goodyear Gatorback's. Last I checked Autozone has Gatorbacks, but sounds like you got a winner.