Help Picking new gears

[oteixeira]

Hi all,

I have a friend at work that has a '70 K-10 that was originally a 292 I-6 with a 4 speed crawler. He has done a "few" mods over time and it is now a 8" lifted 4x4 with 38s, and a 427. He left in the original 4 speed and axel gears.

The first question is based on the original setup what should his gears be from the factory? The second is what would you recomend for it? In 4th gear at 65 (a true 65), he is at 2K on the tach.

Any help is appreciated...

Orlando