1987 C10 and K10, rear ends different besides lug pattern?

[Nasty-LSX]

I have a 2WD and 4WD rear axle housings. These are pretty much the same Rear ends? minus the lug pattern.

I want to use the 4x4 rear end to narrow one inch on both sides then have new rear gear ratio put in.
This is so I dont have to pull my original rear end and have down time on the truck while im doing all this. Thanks

 

[legopnuematic]

Yes both are 8.5” 10 bolts.

 

[Nasty-LSX]

Well surprising to me, the C10 rear is 57 inches wide from drum to drum backing plate.

The K10 is one inch shorter coming in at 56 inches wide. 1/2 inch shorter on each side

Here is what im doing. Going from old school Mexican look to 18x12 in rear. It would have
fit If I had a flare side. But stepper fenders are a hair more narrow.
Thanks everyone.

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