Thread: Chevy 350 or 427

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Originally Posted by Lefcrak

What would a well built rear end consist of. The gear box has different mounts on it than a normal gear box since its on long swing arms. Can I just change out the gears or do I need to get a whole new rear end?

To my way of thinking, a 12 bolt would be the best of all choices, and a 10 bolt a close second. However, I don't know just when GM went to them in the trucks. Since your truck is a C20, the original rear end will probably hold up to a fair amount of oomph; depending on what the first gear ratio of your tranny is, something in the neighborhood of 3.90 or 4.10:1 rear end ratio would be fair.

Originally Posted by Rrumbler

To my way of thinking, a 12 bolt would be the best of all choices, and a 10 bolt a close second. However, I don't know just when GM went to them in the trucks. Since your truck is a C20, the original rear end will probably hold up to a fair amount of oomph; depending on what the first gear ratio of your tranny is, something in the neighborhood of 3.90 or 4.10:1 rear end ratio would be fair.

As Jerry pointed out I'm rebuilding the c10 I don't know what's worth salvaging as far as mechanical parts from the c20. The c10 was an old farm truck so it's geared to pull rather than go highway speeds or above