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Old 12-13-2002, 04:32 PM   #1 (permalink)
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12 bolt info

i have the opportunity to pick up a 12 bolt out of a mid 70's chevy half ton. will if work in my 85 gmc half ton? spring perches aren't a problem, just wondering about the width. thanks.
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Old 12-13-2002, 06:44 PM   #2 (permalink)
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Yep. The only difference may be the driveshaft yoke.
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Old 12-13-2002, 07:11 PM   #3 (permalink)
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Old 12-14-2002, 01:00 AM   #4 (permalink)
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is the bolt pattern the same? i think i remember that the 70's are 5x5 and i think mine is the 5x5.5"....is that correct? or is mine 5x5 as well? it's tough to measure without pulling the wheel, which i don't feel like doing...thanks
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Old 12-14-2002, 05:46 PM   #5 (permalink)
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I don't know of Chevy useing 5x5.5" on anything.
But then, I thought all Chevy 1/2 ton 4x4's were 6 lug, so what do I know.
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Old 12-14-2002, 11:21 PM   #6 (permalink)
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ok cool , you're right.....this is a 2wd though.... thanks
greg
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Old 12-15-2002, 10:01 PM   #7 (permalink)
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Your 85 has either a 3r series Saginaw joint (auto tranny) or a 1350 series joint (granny 4 speed). The 12 bolt has a 1310 series joint. There are conversion u joints from Spicer and NAPA (don't buy the NAPA ones, their needle bearings are junk).
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Old 12-16-2002, 09:50 AM   #8 (permalink)
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thanks!
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