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Old 07-11-2007, 01:46 PM   #1
vern350
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Join Date: Nov 2004
Location: Ontario, Canada
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what will this posi fit in?

i recently recieved a 8.5 posi carrier (clutch style) with 2.56 gears. I believe its from a 74 vehicle. Would this fit in my 88 truck with a 10 bolt? No idea what the spine count is on either. Any help would be appriciated.
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Old 07-12-2007, 02:13 AM   #2
jimfulco
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Re: what will this posi fit in?

It will only work with 2.56 or numerically lower ratios. If it's for sure a '74 unit, it will have 28 axle splines. GM went to 30-spline axles somewhere around '88 or '89, so beware.
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