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I just changed all of my u-joints. Mine used 1310 series on the driveshaft and 1350 series on the half shafts. The Spicer numbers listed on their website http://www.spicerdriveshaft.com are SPL22-1X (driveshaft) and SPL30-1X (half shaft), but I was told 5-799X is the catalog number for the half shaft. That was also the number on the box. Go figure :confused:
But not all vettes use 1310 series on the driveshaft. At some point they changed to the slightly larger 1330 series (Spicer part no. SPL25-1X), but I am not sure which year or what transmission type.