Need help for v belts part numbers - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**a Good Man** · 01-01-2025, 02:05 PM

happy new year to all

need help for v belts part numbers for my gmc k2500 1972 ( napa or good year )

vin number is : Tke242z513060

big thanks

**kwmech** · 01-01-2025, 02:07 PM

Any numbers on the existing belts?

**a Good Man** · 01-01-2025, 02:14 PM

I got lost on the way ‏Alternator belt But the other belts I have a number .

**1970cstblazer** · 01-01-2025, 03:46 PM

GM belt part numbers. Usually located on Ebay.

**a Good Man** · 01-01-2025, 04:44 PM

Quote:

Originally Posted by 1970cstblazer

GM belt part numbers. Usually located on Ebay.

I just want to know the part number napa or good year Alternator belt .

**Rust_never_sleeps** · 01-01-2025, 05:12 PM

I have these in my notes. Chevy, but my layout is the same as yours:

Quote:

Belts:
PS GATES 7350
alternator GATES 7525
AC+fan (for AT vehicles w/o airpump) GATES 7555

Hope this helps

**a Good Man** · 01-01-2025, 05:20 PM

Quote:

Originally Posted by Rust_never_sleeps

I have these in my notes. Chevy, but my layout is the same as yours:

Hope this helps

This item doesn't fit ( alternator GATES 7525 )

**kwmech** · 01-01-2025, 06:23 PM

Belt numbers indicate the belt length. So the PS belt shown is 15356 15/32 wide and 35.6 inches long. The 25-7555 is 10mm wide and 55.5'' long ( I don't know what the 7 means) and the alternator belt is usually 52.5 long, but I recently installed an alt upgrade to a 1 wire on a truck and the belt length needed was a little longer and I still had to force it on a little at 53'' long so it took a 15530. Hope that helps. The gates shown before this post shows a 7525 --7/16'' wide and 52.5 long

**Rust_never_sleeps** · 01-01-2025, 06:56 PM

Quote:

Originally Posted by a Good Man

This item doesn't fit ( alternator GATES 7525 )

Maybe you have the 62A alternator, or... :shrug:

**1970cstblazer** · 01-01-2025, 08:18 PM

Quote:

Originally Posted by a Good Man

I just want to know the part number napa or good year Alternator belt .

A smart man would know to cross reference to get the right belt....

**Sheepdip** · 01-02-2025, 12:05 AM

If worse comes to worse, wrap a rope around it and measure to get a starting point for a belt length.

**a Good Man** · 01-02-2025, 01:04 AM

Quote:

Originally Posted by 1970cstblazer

A smart man would know to cross reference to get the right belt....

A smart man should know that in my country these belts are not available so he should order them in the correct size from the Internet

**a Good Man** · 01-02-2025, 05:30 AM

this Alternator who needs a belt .

**a Good Man** · 01-02-2025, 05:33 AM

Quote:

Originally Posted by Rust_never_sleeps

Maybe you have the 62A alternator, or... :shrug:

No sir its 63A

**Rust_never_sleeps** · 01-02-2025, 06:51 AM

Quote:

Originally Posted by a Good Man

No sir its 63A

I mentioned that because rockauto listed a different belt. Worth a look since they show different options for several combinations of accessories. If you click the info button, it will show belt dimensions

Also agree with the suggestion to measure the path with a rope or tape measure. Belt length is measured at the outside edge of the pulleys.

**a Good Man** · 01-02-2025, 07:13 AM

Quote:

Originally Posted by Rust_never_sleeps

I mentioned that because rockauto listed a different belt. Worth a look since they show different options for several combinations of accessories. If you click the info button, it will show belt dimensions

Also agree with the suggestion to measure the path with a rope or tape measure. Belt length is measured at the outside edge of the pulleys.

I appreciate it sir , Thanks

**Classic Bowties** · 01-02-2025, 02:06 PM

Quote:

Originally Posted by a Good Man

for my gmc k2500 1972

Quote:

Originally Posted by a Good Man

this Alternator who needs a belt .

Saad, as an FYI that alternator shown in reply #13 is not the correct model/type for your 72 K2500, if interested in more info and pics on the 71 and prior vs. 72 style alternator subject see the below linked thread post #10, #16 and #20. Happy New Year and good luck in your search, Mel in Oregon

http://67-72chevytrucks.com/vboard/s...d.php?t=855980

.

**a Good Man** · 01-02-2025, 02:19 PM

Quote:

Originally Posted by Classic Bowties

Saad, as an FYI that alternator shown in reply #13 is not the correct model/type for your 72 K2500, if interested in more info and pics on the 71 and prior vs. 72 style alternator subject see the below linked thread post #10, #16 and #20. Happy New Year and good luck in your search, Mel in Oregon

http://67-72chevytrucks.com/vboard/s...d.php?t=855980

.

Very clear. Thank you sir and happy new year

**Accelo** · 01-02-2025, 05:44 PM

As information only the X in the number is for the clogs on the inside of the belt.
it makes no difference on the sizing. They are rated for smaller diameter pulleys and higher HP than the belts with the smooth inner. Either with or with out the X in the umber will function fine. I believe this "X" type of belt was invented after out trucks were made. OEM belts of this era were all smooth on the inside.
Cheers

01-01-2025, 02:14 PM	#3
a Good Man Senior Member Join Date: Aug 2010 Location: FL Posts: 2,080	Re: Need help for v belts part numbers I got lost on the way ‏Alternator belt But the other belts I have a number . Attached Images __________________ MY Facebook https://www.facebook.com/saad.alhajri.7106 ( saad_alhajri ) on Instagram

01-01-2025, 03:46 PM	#4
1970cstblazer All stock and staying that way Join Date: Jul 2003 Location: Elkland, PA Posts: 1,864	Re: Need help for v belts part numbers GM belt part numbers. Usually located on Ebay. Attached Images __________________ 1970 K/5 Blazer CST 4WD, Medium Bronze, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration finally getting close to completion.. 1972 Cheyenne Super 20 2WD, DK Blue/White, 90K ACT. miles, 402, TH400, 4.10 open, tilt, tach, vacuum, A/C, AM/FM, manual throttle.. A mostly original paint never rusted Texas survivor... 2017 Sierra 1500 SLT 4WD, Black, 45k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 62k miles, 3.6, 8L45, 3.23 LS, 18" wheels

01-01-2025, 06:23 PM	#8
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,653	Re: Need help for v belts part numbers Belt numbers indicate the belt length. So the PS belt shown is 15356 15/32 wide and 35.6 inches long. The 25-7555 is 10mm wide and 55.5'' long ( I don't know what the 7 means) and the alternator belt is usually 52.5 long, but I recently installed an alt upgrade to a 1 wire on a truck and the belt length needed was a little longer and I still had to force it on a little at 53'' long so it took a 15530. Hope that helps. The gates shown before this post shows a 7525 --7/16'' wide and 52.5 long

01-02-2025, 12:05 AM	#11
Sheepdip Senior Member Join Date: Nov 2018 Location: Waterford California Posts: 2,634	Re: Need help for v belts part numbers If worse comes to worse, wrap a rope around it and measure to get a starting point for a belt length.

01-02-2025, 05:44 PM	#19
Accelo Senior Member Join Date: Mar 2015 Location: washington Posts: 2,301	Re: Need help for v belts part numbers As information only the X in the number is for the clogs on the inside of the belt. it makes no difference on the sizing. They are rated for smaller diameter pulleys and higher HP than the belts with the smooth inner. Either with or with out the X in the umber will function fine. I believe this "X" type of belt was invented after out trucks were made. OEM belts of this era were all smooth on the inside. Cheers

01-01-2025, 02:05 PM	#1
a Good Man Senior Member Join Date: Aug 2010 Location: FL Posts: 2,080	Need help for v belts part numbers happy new year to all need help for v belts part numbers for my gmc k2500 1972 ( napa or good year ) vin number is : Tke242z513060 big thanks Attached Images __________________ MY Facebook https://www.facebook.com/saad.alhajri.7106 ( saad_alhajri ) on Instagram

01-01-2025, 02:07 PM	#2
kwmech Senior Member Join Date: Mar 2003 Location: Colfax-California Posts: 8,653	Re: Need help for v belts part numbers Any numbers on the existing belts?

01-02-2025, 05:30 AM	#13
a Good Man Senior Member Join Date: Aug 2010 Location: FL Posts: 2,080	Re: Need help for v belts part numbers this Alternator who needs a belt . Attached Images __________________ MY Facebook https://www.facebook.com/saad.alhajri.7106 ( saad_alhajri ) on Instagram



Register or Log In To remove these advertisements.

Register or Log In To remove these advertisements.