All of the 10 bolts had a 1310 and most of the 12 bolts had a 1310. Some of the heavy duty 12 bolts had a 1330. The 8.2 10 bolt Chevy has 25 splines, the 8.2 BOP has 27 splines, the 12 bolt and 8.5 10 bolt have 30 splines.
Cars didn't get 1350 u joints. They were used in 3/4 and 1 ton trucks. The BOP 8.2 also got a 1330 u joint in some cases. The 8.2 BOP was used in Firebirds and some of them have been swapped into Camaros.
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