A P30 will often have a Dana 70, or 70HD, or 80, or a corporate 14 bolt. No good way to tell what you will find without looking first.

In any case 3.54 is as fast as available for most, and 3.31 for a Dana 80.

If you want fast gears a Ford 9" has some good choices in the 2.xx range.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-