anyone know part number for belt?

[jasonroman]

the belt that goes to altenator, around the bottom big pulley thing and around one other part?
sorry if i sound like a dumb ass, i am when it comes to this...
apparentley, it broke off and now the truck dont start obviously.
i thought i had the right belt..15435
but its not the right belt.
thanks for any help. dont wanna keep going back and forth to store.
is this belt i need called a v belt?

[BLE 'BURBAN]

year make model engine size with or w/o a.c. and with or w/o air pump. Need info to get the right part looked up for you.
As I always tell the techs at work (GM DEALERSHIP) get me the right info and I'll get you the right part.

[BLE 'BURBAN]

BTW I'm 4 hours behind you and less than 2 hours to be at work.

[jasonroman]

85 gmc sierra classic
believe its a gmc 5.7 motor. originally a 5.0. changed for 5.7 or so i was told
has ac.
not sure about the air pump?? not really sure what or where it is.

[BLE 'BURBAN]

If You have an air pump it would be mounted directly below the alternator on the passengers side of the engine.
Belt Part Number from NAPA with air conditioning is 257445
I'll look up the O.E.M. belt # for you when I get to work.
PM me your email address and I'll email the info to you from work as I cannot access this website from work.

[jasonroman]

i have something mounted under alternator that has a belt that runs to fan?
that an air pump?
chinomio@optonline.net
thanks for help man. much appreciated.

[BLE 'BURBAN]

yep thats an air pump for the emissions control system.

Send me an email to my work davidb@aksales.com and I'll get you the gm part number for the belt as well as a belt routing diagram if I can.

[Tx Firefighter]

Maybe this will help you.

Your belt is a 15435 and it does not fit you say.

On a belt, the part number means something. You need to figure out if you need the belt shorter or longer than what you have for it to fit correctly and adjust the part number accordingly.

The 15 in the part number is the width. That part is right for a v belt on these trucks. That won't change. You need a 15___ number belt.
The 435 means 43.5 inches long.

Belts come in 1/2 inch increments.

So, a 15445 would be an inch longer than what you have. A 15420 would be 1.5 inches shorter, and so on.

Figure out how much shorter or longer you need and adjust the part number.

You have to be smarter than the parts store people if you have any hope of getting the right part.

[BLE 'BURBAN]

Originally Posted by Tx Firefighter

Maybe this will help you.

Your belt is a 15435 and it does not fit you say.

On a belt, the part number means something. You need to figure out if you need the belt shorter or longer than what you have for it to fit correctly and adjust the part number accordingly.

The 15 in the part number is the width. That part is right for a v belt on these trucks. That won't change. You need a 15___ number belt.
The 435 means 43.5 inches long.

Belts come in 1/2 inch increments.

So, a 15445 would be an inch longer than what you have. A 15420 would be 1.5 inches shorter, and so on.

Figure out how much shorter or longer you need and adjust the part number.

You have to be smarter than the parts store people if you have any hope of getting the right part.

Too short by an inch.

OE # 88934331
15445 - ACDelco# | BELT,FAN V-BELT
High Capacity V-Belt (Standard) [ALTERNATOR BELT (35)]

Fan & Alt ; w/V-Belt Drive ; w/AC ; 1 Per Veh

[jasonroman]

well i went looking for this part.
one place wanted to give me some fat flat belts.
other place had similar number to your 15445 but i wasnt sure so i left it and went to napa.
they told me they had the belt i needed.
get there and buy belt....get home and it looks like the same belt i already had here....

question. when i loosened alt to try the belt i had, i had to sent if forward lets say 3 inches. about max forward. and the belt i have will not go over it.
have not tried the new belt.
but should i need a belt that will cover the 3 inches i moved alt forward???
or does the belt expand over time??
i dont think so but worth asking.


also, how do i know what motor is in my truck.
p.o. told me it was originally a 5.0 350???
and said to have replaced old motor with a gm crate engine thats said to be a 5.7 350

[psuedopimp]

belts will stretch overtime. you will have to move the alt a few inches to get the new belt on. will be a tight fit and then use a bar to tighten it further before tightening the bolt.

[jasonroman]

wow so 3 inches is ok.
im sure the belts been on truck for years.
but is this something that needs to be pulled on every couple months?
i mean if new belt happens to make it. then ill be 2-3 inches from my rusty markings of old placement

[psuedopimp]

as long as the belt is the right width, the length can be off a little. as long as you can get it tight, but it shouldn't be as tight as a banjo string. i think it is a 1/4 inch or so you can push down when it is tight. there are prob specs somewhere, but i just tighten it and if it doesn't squeak i call it good.