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any 7.5 or 7 5/8 will go right in our elcos.the olds 442 came with the 373 gear but is hard to find. i have a couple sets at home. but any s 10 or astro is your best sourse for 373 s. i think the axle code is gt4 for 373 s. the s10 and astro carriers are mostly 28 spline except for the real early s10s
 
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