70 4x4 chevy pu axles vs 71 4x4 blazer axles
 

does anyone know if there were any differences between front and rear axles/housings used in 4x4 trucks vs those used in 4x4 blazers. Were some heavier than others. Both are 1/2 ton models.

I am restoring a 70 4x4 and I purchased a 71 4x4 blazer donor vehicle for parts. The blazer has front discs which I will use. I don't know whether I should replace the whole assembly or just remove the discs. One thing that might have a bearing on this is that the blazer has a detroit locker in the front. I would want to swap that out too. The gears on both vehicles are 3.08. And what about the rear? neither one seems to be posi in the back, yet I don't know if the axle housings are of the same construction. I have not compared the drum sizes yet. Want to check axles and see if maybe the blazer had any modifications done to the rear. Anything in particular I may look at?

Any knowledge on any of this?

Thanx again

As for the front i would just do the swap. It's heavier work but not as much, especially if you want that posi. As far as the rear goes chevy lists 2 different part numbers for 67-70 - 71-72 for rear drum shoes, so the drum size could be different between the two but the housing is the same. I would remove the rear diff cover of both and inspect the ring & pinion of each and roll with wich ever one looks fresher.

Both rears should be chevy 12 bolts. For the front as was said just swap the whole front axle.

Thanks guys. I will use your suggestions.