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Old 10-19-2013, 07:45 AM   #1
kenn
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Diff fit Question

Hello, I have a 94 roadmaster for parts and was woundering if the posi will fit in my 72 c 10
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Old 10-19-2013, 08:00 AM   #2
hugger6933
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Re: Diff fit Question

kenn, I'm gonna say no. The roadmaster has a 8.5 inch ring gear with 10 bolts attaching it to the carrier. The rear end in your truck is most likely a 12 bolt. Jim
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Old 10-19-2013, 08:01 AM   #3
Mike C
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Re: Diff fit Question

Short answer: No.

Longer answer: Your C-10 has a 12 bolt cover truck-specific rear axle while the Roadmaster uses the GM corporate 10 bolt. The 10 bolt was also found in the back of trucks starting around 1980 in 2 wheel drive. They are 28 spline axle shafts until '88 when the new body style trucks received a 30 spline upgrade. The Roadmaster should be a 30 spline as well so would work in one of those.
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Old 10-19-2013, 08:11 AM   #4
kenn
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Re: Diff fit Question

Thank you. The frame on my roadmaster broke and I was hopeing that I could swap parts.
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Old 10-19-2013, 02:15 PM   #5
PanelDeland
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Re: Diff fit Question

If the complete rear end is the same width backing plate to backing plate,you could weld on new mounts and possibly use it if you can find a U-joint set to match up,but the 12 bolt is a stronger rear.
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Old 10-19-2013, 05:11 PM   #6
kenn
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Re: Diff fit Question

Thanks. I need to put a posi in it and was looking to use what I had if I could.
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Old 10-19-2013, 06:03 PM   #7
haminator
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Re: Diff fit Question

That 10 bolt posi is worth 100 150 on Ebay,then you could use that money to buy one for the 12 bolt
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Old 10-22-2013, 09:55 AM   #8
kenn
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Re: Diff fit Question

I will get my daughter to do that, thanks. When I am ready to buy one i'll check back, this site seams to have a lot of info.
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