Any idea what gears I might have?

[72timemachine]

I just bought a '69 Chevy c/10 Custom long bed. No idea what engine or manual trans it. While I did try to locate the axle id number on the passenger front portion of the axle tube, I found nothing. I wire brushed it to death and looked at the front, top and rear of the tube with a powerful flashlight.

It is a 5 lug with 12 bolts holding the pan on and while I would drop the cover and count how many times the pinion gear rotated in relation to the ring gear, I would rather not do this where it is located. The fill plug is located on the driver's side front and the only number, beside the casting date is a large GM54 on the driver's side housing. The suspension is a coil spring/trailing arm set up. The info inside the glove box tells me nothing either. The driveshaft is very skinny, looks like a toothpick.

Anyone got a ballpark idea of what gears I may have? Thanks for any help.