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How do i get the right size serpentine belt?

My stock belt is 97.175inches -1" gives me 96.175 inches. Ok so now if i go to the parts store and tell them i need a 96.175 inch belt i guarantee they will say what kind of car and year. Then i will have to explain what im doing then they are gonna say well i need a car and year, i cant get one by length

Then don't do that. The reason I gave you the suggestions I did is so you can take a part number to the parts store with you. Tell them I need this part number and save the frustration. You can look on their website to see if they have it before you ever leave the house.
 
Then don't do that. The reason I gave you the suggestions I did is so you can take a part number to the parts store with you. Tell them I need this part number and save the frustration. You can look on their website to see if they have it before you ever leave the house.
Ok gotcha
 
I have a 400 amp alternator on the way and the pully on it is smaller than stock oem. so how do i go about getting the right size serpentine belt to fit proprly? I tried to have my mechanic help me but they are like "we dont want to be involved with aftermarket parts and install", Psshh. I hope i can just walk in and get it from napa or auto zone etc. So how do i figure out this belt size thing? The alternator manufacturer says the belt will need to be about 1/2" to1" shorter than stock
I think the belt length is in the part# of Goodyear belts.
 
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Is it 4wd?extended cab? Shortbed? Is it rusted out yet?what this got to do with a simple dome lite bulb part number 1156? Definatly avoid autozone ,if its not listed exact they DONT LOOK DONT CARE N YOUR SCREWED as said previously measure find part number via size dont get it dirty try n if it needs to be longer or shorter return it n buy what you need.
And most importantly when you find proper size WRITE BRAND AND PART NUMBER UNDER THE HOOD WITH MAJIC MARKER PERMANET INK
 
Measure the diameter of both pulleys, subtract the smaller from the larger and divide by 2. That should get you in the ballpark of the length that you need so long as the alternator shafts are in the same location relative to the mounting points.
The other thing that you can do is to swap the larger pulley onto the new alternator. That will not overdrive it as much, and require a few more RPM to reach maximum output of the alternator, but at least it would get you going if you can't find the correct belt right away.
 
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Can you just pull the stock pulley off of the original alternator and install it on the new one? Same size shaft?

Also, I was an Asst. Manager at Autozone for 7 years, I was the "go to guy" for stuff like belt length changes, hoses, nut and bolt sizes. Also pulley changes, like from a 5 rib pulley to a 6. Like if a customer needed to bypass a stuck frozen AC compressor, or a bypass pulley to replace the compressor, what next size length belt could fit?
My Cavalier uses either an 888K5 (88.8" K for Automotive and 5 for 5 ribs) or the alternate part would be 4050887 (405 for Automotive 5 ribs and 0887 for 88.7" length, or about 1/10" shorter), which the Tensioner will take up the difference. So, if I needed to bypass the AC compressor, I would look at the shorter K5 belts.
 
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Then don't do that. The reason I gave you the suggestions I did is so you can take a part number to the parts store with you. Tell them I need this part number and save the frustration. You can look on their website to see if they have it before you ever leave the house.
Make sure you deal with a manager. Most counter kids dont even know how to look up a part number without YMM.
Been trying to find the right vbelt for a Frankensteined older toro z mower for a year now and no one knows measurements, just year make model...
 
Make sure you deal with a manager. Most counter kids dont even know how to look up a part number without YMM.
Been trying to find the right vbelt for a Frankensteined older toro z mower for a year now and no one knows measurements, just year make model...

That's how we did it when I worked at a mom and pop shop in high school. They would deliver parts to us and knowing who not to talk to was key.

These days are easier. Being able to look up my parts online and take a list to the store is so much easier. The last time I bought a Gates belt it was cheaper on Amazon.

I went to high school with a guy that worked at oreilly. He had a dirt bike that was running rough and poured a can of fuel system cleaner in it. Still ran like shit so he read the label and figured out he used too much. I swear to God he poured water in the fuel tank to dilute the can of carb cleaner.

Parts people aren't technicians. If they were they'd be making more money fixing stuff.
 
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I used to go to the Dallas-area NAPA Distribution Center twenty years ago where they knew me well enough I could step behind the counter to use the still-extant paper catalogs. There was plenty of cross-tracing that was FAR faster than computer use allows.

Much like card catalogs at a library. There’s nothing so slow as software-driven searches.

In both cases, what one may need may be in AN adjacent avenue.

Chain stores have ruined America as surely as television.

.
 
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