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Old 11-05-2010, 01:11 AM   #1
brown78
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Width of the rear...!?! WMS-WMS

Hello everyone. I'm looking for the wheel mounting surface to wheel mounting surface for the rear axle in a 1978 2wd c10 12 bolt. I've search the forum with no luck, and found everything but on the web. Looking to swap out my 3.07 open diff to at least a posi unit, higher gear a plus. Need the width so I can see what donor vehicles to search for. I could go pull the tires off my truck, hoping somebody has the info though....Thanks.
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Old 11-05-2010, 11:43 AM   #2
softballnrd27
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Re: Width of the rear...!?! WMS-WMS

It is right around 65 inches if I am not mistaken. I have a ford 9" that is 65" wms to wms and I shouldn't have any problems putting in under the truck. You can find the 9" all day long bc they were used in so many different vehicles for a long time. I got mine for $50 drum to drum. To keep costs down just have the axles redrilled along with the drums. I am going to see if the drums are will swap between the 10 bolt and 9" to try and save even more $$$.
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Old 11-05-2010, 01:40 PM   #3
brown78
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Re: Width of the rear...!?! WMS-WMS

Yeah I have a 12 bolt in my 78, not sure if its the same wms-wms as the 10 bolt...anyone?
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Old 11-05-2010, 11:45 PM   #4
87chevy.com
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Re: Width of the rear...!?! WMS-WMS

I'ive got a 12 bolt in the garage. I am going to the garage tomarrow afternoon, I can get a tape measurement for you.
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Old 11-06-2010, 12:46 AM   #5
brown78
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Re: Width of the rear...!?! WMS-WMS

That would be great, I would like to find something Sunday at the swap meet, there's no way Ill have time to get to my truck and pull the wheels to get a measurement, Thanks.
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Old 11-06-2010, 10:03 PM   #6
brown78
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Re: Width of the rear...!?! WMS-WMS

Going to swap meet in the a.m., anyone have a hard measurement? SEND it PLEASE even if its late tommoro. Thanks
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Old 11-06-2010, 10:55 PM   #7
lolife99
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Re: Width of the rear...!?! WMS-WMS

64-3/8".
Just measured the one I took out of a 87 1/2 ton 2wd Suburban.
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Old 11-07-2010, 10:45 AM   #8
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Re: Width of the rear...!?! WMS-WMS

Quote:
Originally Posted by lolife99 View Post
64-3/8".
Just measured the one I took out of a 87 1/2 ton 2wd Suburban.
Ditto on that measurement. I'm putting a 3.42 posi from an 87 suburban today. 11.25" drums, 2.75" shoes, all match the 3.08 coming out of a 76.
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