Question about OEM wiper arms - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**71CHEVYSHORTBED402** · 02-10-2025, 01:34 PM

Pretty sure these are OEM. Not sure who made them, perhaps Trico. I'm wondering what the head, or spindle nut for lacking a better term is made and finished???? All I know is the coating is durable. Perhaps anodized?

GM parts were so great right? 140K on these parts, less the rubber.

**71CHEVYSHORTBED402** · 02-10-2025, 06:19 PM

I'm not 100% sure it's coated, but if so, it's hard. However the part was made, it's not magnetic, while the stainless arm very much is.

**1970cstblazer** · 02-11-2025, 08:13 AM

Those are OEM. Its a die cast zinc metal. I have had the silver coating peel off on a couple of them. I thinks it's a plating, not paint. I have also had the teeth strip. Mine were made by Trico.

**71CHEVYSHORTBED402** · 02-11-2025, 12:52 PM

Quote:

Originally Posted by 1970cstblazer

Those are OEM. Its a die cast zinc metal. I have had the silver coating peel off on a couple of them. I thinks it's a plating, not paint. I have also had the teeth strip. Mine were made by Trico.

Thank you. I just checked my notes to see these arms are stamped TRICO 3378874

02-10-2025, 01:34 PM	#1
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,689	Question about OEM wiper arms Pretty sure these are OEM. Not sure who made them, perhaps Trico. I'm wondering what the head, or spindle nut for lacking a better term is made and finished???? All I know is the coating is durable. Perhaps anodized? GM parts were so great right? 140K on these parts, less the rubber. Attached Images __________________ Tony 1971 C10 Custom Deluxe SWB 402/400TH A/C I developed an assembly information kit for restoring my truck from nuts and bolts. It's written in Assy. order, short & simple, packed with all OEM hardware ID; castings; part ID; 100s of part numbers; wiring simple - Resource, and trivial too. Much info. applies to all 67-72 GM, A/C vehicles, esp. trucks W/O saying. Full search ability, including to 700+ images of illus., parts, charts, Assy., points of interest, cab, bed, & front clip cart plans- Specials and cores were serviced out and R excluded e.g. front/rear glass, body/paint, engine core, rebuilt hinges, steering box, trans, etc. The project was in-line with long former professions developing process, policy, specs, demo, written for novices, admin., policy, engineers, development, systems & test - Public & govt 2, gross. Sell soft copy cheaply, PM if interested.Build thread:https://67-72chevytrucks.com/vboard/...d.php?t=730025

02-10-2025, 06:19 PM	#2
71CHEVYSHORTBED402 Senior Member Join Date: Feb 2009 Location: Northern Nevada Posts: 7,689	Re: Question about OEM wiper arms I'm not 100% sure it's coated, but if so, it's hard. However the part was made, it's not magnetic, while the stainless arm very much is. __________________ Tony 1971 C10 Custom Deluxe SWB 402/400TH A/C I developed an assembly information kit for restoring my truck from nuts and bolts. It's written in Assy. order, short & simple, packed with all OEM hardware ID; castings; part ID; 100s of part numbers; wiring simple - Resource, and trivial too. Much info. applies to all 67-72 GM, A/C vehicles, esp. trucks W/O saying. Full search ability, including to 700+ images of illus., parts, charts, Assy., points of interest, cab, bed, & front clip cart plans- Specials and cores were serviced out and R excluded e.g. front/rear glass, body/paint, engine core, rebuilt hinges, steering box, trans, etc. The project was in-line with long former professions developing process, policy, specs, demo, written for novices, admin., policy, engineers, development, systems & test - Public & govt 2, gross. Sell soft copy cheaply, PM if interested.Build thread:https://67-72chevytrucks.com/vboard/...d.php?t=730025

02-11-2025, 08:13 AM	#3
1970cstblazer All stock and staying that way Join Date: Jul 2003 Location: Elkland, PA Posts: 2,500	Re: Question about OEM wiper arms Those are OEM. Its a die cast zinc metal. I have had the silver coating peel off on a couple of them. I thinks it's a plating, not paint. I have also had the teeth strip. Mine were made by Trico. __________________ 1970 K/5 Blazer CST 4WD, TOTM winner December 2024! Medium Bronze poly, 93k ACT. miles, 350, 4 speed, rear positraction, 16.5" x 8.25" HD Kelsey Hayes wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Frame off restored 1970 K20, To be a clone of my Grandfather's K20, Dark Blue poly, 350, 4 speed, 16.5" X 8.25" Kelsey Hayes wheel option, tilt, tach, vacuum, AM radio. Latest project truck 1972 Cheyenne Super 20 2WD, Dark 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, 51k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2... 2019 Canyon SLT 4WD, White, 71k miles, 3.6, 8L45, 3.23 LS, 18" wheels



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