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Differences Between 640-641/642 Rear Hub?

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tprjj49707

Posts: 82

Joined: Thu Sep 13, 2007 8:02 am

Post Tue Jan 24, 2012 9:23 am

Differences Between 640-641/642 Rear Hub?

I have a Scout rear hub with perfect sprocket threads. The brake cover is that of a 641-2.

I am considering trading off the 641 cover for a 640 cover, or selling it outright & buying the correct one.

As far as hubs go, are the covers interchangeable? Or do I have a 641/642 hub?
Last edited by tprjj49707 on Tue Jan 24, 2012 9:40 pm, edited 1 time in total.
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tomfiii

Posts: 12

Joined: Wed Oct 05, 2011 12:50 pm

Post Tue Jan 24, 2012 4:06 pm

Re: Differences Between 640-641/642 Rear Hub?

Are you talking about the brake backing plate? The hubs are different widths for 1941 ,due to right or left side speedo drive and 1940 is also different. The Virtual Indian web site people should have a better knowledge of.
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tprjj49707

Posts: 82

Joined: Thu Sep 13, 2007 8:02 am

Post Tue Jan 24, 2012 9:38 pm

Re: Differences Between 640-641/642 Rear Hub?

Yes, the brake backing plate. The hubs are different widths?
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tomfiii

Posts: 12

Joined: Wed Oct 05, 2011 12:50 pm

Post Wed Jan 25, 2012 2:27 pm

Re: Differences Between 640-641/642 Rear Hub?

Hi, should of said bearing sizes were different for early 41 up to FDO 340 and FDO 341 and later was larger be. , the '40 hub is narrower 6-5/8" wide. The backing plates ,'41'42 made for plunger rear, '40 all 45's,'37 to'39 for 45ss,'36 for 45ss and '36 that fits standard 45 and 74 and 4cyl. Go to the Jerry Greer site and go to order from catalog and put your year in and go to part number and click on to enlarge for specs.

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