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01-01-2021, 10:25 AM | #1 |
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Join Date: Jan 2016
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31 Universal Joint is it original or repro
2 Questions.
1: How do you know when a ujoint is good or no good? 2: Is this ujoint in the photos an original or repro? |
01-01-2021, 10:35 AM | #2 |
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Join Date: Jun 2010
Location: San Antonio, Texas
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Re: 31 Universal Joint is it original or repro
The same basic U-joint was used clear up through 1948 and many more were likely manufactured by outside sources in the auto parts industry.
The bearings/bushings, journals, and splines all wear out eventually. If the splines are still in good condition, the bushings and journal ring can be replaced to put one back in service. If the splines are worn or there is wear or cracks in the yokes then they are beyond repair. |
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01-01-2021, 11:51 AM | #3 | |
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Location: Mint Hill, North Carolina
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Re: 31 Universal Joint is it original or repro
Quote:
There should be NO rotational play on the splines or bushings. |
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01-01-2021, 12:41 PM | #4 |
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Location: Oregon
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Re: 31 Universal Joint is it original or repro
That is a replacement u-joint if in a Model A.
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01-01-2021, 12:44 PM | #5 |
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Location: Florida Panhandle
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Re: 31 Universal Joint is it original or repro
Either original or a very good repro. More likely domestic rather than off shore. Also the more desirable spider type rather than the riveted variety. If no rotational play it would be a good replacement. Since U-joints are such a chore to change best to put in a quality unit rather than a time bomb.
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01-01-2021, 12:48 PM | #6 |
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Re: 31 Universal Joint is it original or repro
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01-01-2021, 12:49 PM | #7 |
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Location: Southern Maine
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Re: 31 Universal Joint is it original or repro
Looks like a V8 joint which should fit.
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01-01-2021, 02:21 PM | #8 | |
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Location: So Cal
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Re: 31 Universal Joint is it original or repro
Quote:
The change to the Spicer design is mentioned in the March 10, 1931 Indianapolis Service Letter. |
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01-01-2021, 03:33 PM | #9 |
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Join Date: Sep 2017
Location: Mint Hill, North Carolina
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Re: 31 Universal Joint is it original or repro
Most of the "reproduction" parts don't have identification markings cast into the components, and the castings appear "rougher".
The part number is xx-7900 to fit 1928-1948 vehicles. NOS parts are getting hard to find, and as mentioned in my prior post, many of the "new" replacements won't fit correctly in the housing. Good used universals can still be found. If no rotational play in the splines and bushings, and no other obvious flaws (cracks), then use it. Do not use the riveted style that was original to the A. |
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