What's the difference between the 38001 and 38006

From a separate website the diameters 38001 is ~ 3.58” and the 38006 is ~ 3”. Other dimensions are the same. Need to look at mfgr specs.

will any of these idler pulleys work on my 1979 lincoln continnental mark 5 400 engine

I may be wrong but I believe in 1979 they used V-Belts and these idler pulleys are for serpentine Belts 5455-09056246 this is the part number for an idler closer to what your looking for. Check on parts geek website. If the pulley is still in good condition you can press a new bearing into it. Bearing numbers are printed/stamped on the outside of the bearing and are easily sourced on amazon. It’s usually a bearing number like 203. You can also measure the bearings diameter, thickness and center hole dimension to get the correct bearing.

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⚙️ Keep your engine running smooth with precision-driven performance!

DRIVE BELT GUARDIAN - Keeps your accessory drive belt perfectly aligned to prevent wear and tear.
VERSATILE APPLICATION - Fits most makes and models, including special applications beyond GM vehicles.
ENGINEERED FOR PERFECTION - Steel build ensures durability and long-lasting performance.
TRUSTED QUALITY ASSURANCE - Backed by General Motors for premium aftermarket reliability.
SEAMLESS OEM COMPATIBILITY - Manufactured to meet exact General Motors specifications for flawless fit.

The ACDelco Gold 38001 Idler Pulley is a premium steel accessory pulley designed to maintain optimal drive belt alignment. Engineered to meet exact OEM specifications, it ensures perfect fit, form, and function for General Motors vehicles and many other makes and models. This durable, machined pulley is a trusted, high-quality replacement part backed by General Motors, delivering reliable performance and extended belt life.

Reviews

J**Y

It Fits

Fits 1995 Chevy G20 5.7l with AC. Good quality. So far no issues. Installed with new Bando belt and Gates tensioner.

7.09.2025

M**E

Great Product/Reasonable Price

Good Delco part. Worked as advertised

18.07.2025

P**E

OEM part for a good price arrived quickly

What I received was an original OEM part. For my 1999 Chevy S10 it fit perfectly, functioned flawlessly and took just 5 minutes to install. I found this part in the local part stores for 50 to 100% more money so I received good value for an OEM part from Amazon and it came right to my door in two days (quicker if needed).Note for some applications: your OEM pulley may come with a keeper washer that holds the bolt in place. This old keeper washer can be pulled off with pliers and discarded. It must have been some assembly aid when your rig came off the assembly line and it not essential for function - pull it off and throw it away if you find one in your case. For my 1999 Chevy S10, torque was 35 to 37 foot pounds.The Amazon 'fit guide' has been very reliable in my experience. Thanks to Amazon for supplying the right part for a fair price and delivering it to my door.

8.06.2025

K**R

Good quality

Worked great on my 2006 F150 4.6

6.08.2025

N**E

2000 Mazda B4000

Just like new.

24.07.2025

R**K

Direct fit

Direct fit, Worked well as described.

29.08.2025

B**S

Factory pulley.

Factory pulley works like the original as it should.

22.09.2025

G**!

GM goodness

Can’t beat Delco for GM products works perfect no noise. I think we’ll last a long time.

19.09.2025

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Manufacturer	ACDelco
Brand	ACDelco
Model	ACDelco - Idler Pulley (B) (38001)
Item Weight	10.2 ounces
Product Dimensions	3.6 x 3.6 x 2 inches
Item model number	38001
Is Discontinued By Manufacturer	No
Exterior	Machined
Manufacturer Part Number	88909582
OEM Part Number	88909582

ACDelco Gold 38001 (88909582) Idler Pulley

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