Can I machine down some van axles to fit?

[72timemachine]

I can lay my hands on some free rear axles out of a '72 1/2 ton, GMC Vandura which has a small block v-8 and th350. They have a spline count of 30, are 33 3/8" long and are a 5 on 5 lug pattern. I found this information on a website and am not sure if it is accurate.

I would like to try and have them shortened if possible to fit a '69 c10 rear end, which currently has an axle spline count of 30, are 30 3/4" with a 6 lug pattern. I do not feel the 6 lug can be re-drilled to locate a 5 on 5 lug pattern due to the larger hub in the center which will not allow my stock rim to fit.

Do you feel this is too expensive a venture? The axles are free. The cheapest kit I can find is upward of $280 for axles, bearings, seals and lug studs. I would also have to get new drums as they do not come with the kit.

Anyone ever shortened a rear end, the difference, if my math is correct is 2 5/8" between the 5 lug van axle and my 6 lug axle.

Thanks for any advice.