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Old 02-04-2015, 12:03 PM   #1
V12Bill
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Default Wiper arms

The windshield wiper motor shaft on my '39 PU has threads on the end of it as if there should be an acorn type nut on it to retain the wiper arm. When I got the truck , there was a serrated cap on the end of the shaft held on by a shoulder nut and the wiper arm was of the type with serrations to keep the arm from spinning on the shaft. I can't seem to find the correct wiper arm or nut to retain the arm. Which type arm should I have with my truck, the serrated type or the bolt on type with a shoulder nut? It's not a big deal, but I would like for it to be correct.
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Old 02-04-2015, 05:07 PM   #2
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Default Re: Wiper arms

Look at www.newportwipers.com they have a good selection of blades and arms as well as 12vt wiper conversions.
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Old 02-04-2015, 08:37 PM   #3
V12Bill
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Default Re: Wiper arms

Thanks for the lead, but he has only electric conversions for hot rods.
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Old 02-04-2015, 09:07 PM   #4
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Default Re: Wiper arms

The arm is off my '39 since I replaced the windshield. I'll dig it out and take some photos in the morning. I thought that Joe's Antique Auto listed some arms but I might be wrong.
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Old 02-05-2015, 11:56 AM   #5
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Default Re: Wiper arms

Attached are photos of the wiper arm assembly from my '39 p/u.
Attached Images
File Type: jpg IMG_2807.JPG (69.5 KB, 16 views)
File Type: jpg IMG_2808.JPG (102.8 KB, 9 views)
File Type: jpg IMG_2809.JPG (94.5 KB, 11 views)
File Type: jpg IMG_2810.JPG (88.8 KB, 10 views)
File Type: jpg IMG_2811.JPG (85.5 KB, 9 views)
File Type: jpg IMG_2812.JPG (120.6 KB, 8 views)
File Type: jpg IMG_2813.JPG (94.9 KB, 9 views)
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Old 02-05-2015, 03:18 PM   #6
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Default Re: Wiper arms

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That is exactly what I have been looking for. I suspected that the arm was bolted on, but this also tells me that it was also straight. Now to try and find the bolt on arm. I suspect it is 8" from the center of the hole to the part that the blade clips to. Thanks for the photos.
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Old 02-05-2015, 06:12 PM   #7
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Default Re: Wiper arms

Joe's Antique Auto lists the nut and arm on page 74 od his on line catalogue.

78-17481
Wiper arm nut, chrome, holds
arm to tower, 1937-40 cars
and 1937-47 pickup ............... 37-47
3.00 ea
Wiper Arm
1937-1939 Closed car and pickup
78-17529
Use with original sty le blade........ .37-39 15.00 ea
78-17529-WT
Use with wrist type blade *.......... .37-39 15.00 ea
68-17528
8-1/4 long................................ 28-40
3.00 ea
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Old 02-05-2015, 09:14 PM   #8
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Default Re: Wiper arms

Thanks, I will call and order them in the morning.
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