'69 K20 Parts Interchange Help

[wyoman64]

I have a '69 K20 with 350, Rockwell T221 xfer case, Eaton HO52 rear axle, closed-knuckle Dana 44 front (4.56's), and non-power drum brakes all around. I have a 4 wheel drive problem and am not sure if it is in the front diff, or the t-case.

Here's my Question: I have found a '76 K20 rolling chasis/cab that has a GM 12-bolt posi rear, open-knuckle disc brake Dana 44 front (4.10's), power brake booster and proportioning valve. Will these parts fit my '69??? I am not so much concerned with driveline length, but is the spring perch width the same on the '69 and '76??? Will the steering bolt up?

Anyone that has a good knowledge of parts interchangability, I could really use some help here. Any info is much appreciated.

Thanks In Advance . . . .

Brian

P.S. If the parts swap works out, is there anyone interested in this Eaton HO52 rear axle?